Palaeo After Dark
A group of fresh faced scientists have biweekly informal discussions about evolutionary biology and palaeontology... over beer.
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Podcast 337 - Smol Beeg Animals
07/26/2026
Podcast 337 - Smol Beeg Animals
The gang discusses two papers that look at early tetrapods. The first paper investigates the transition to terrestrial environments in early tetrapods, and the second paper looks at some very small Dimetrodon. Meanwhile, Amanda has a disproportionate cat, James talks smack about a dead synapsid, and Curt gives gardening tips. Up-Goer Five (Amanda Edition): This week our friends look at two papers on animals with hard bits in their back and four legs. The first paper asks when did animals with hard bits in their backs and four legs first start doing a big change as they grew up. Today the sort of early group of animals with hard bits in their back and four legs are really not that early and are actually really different but a lot of people use them to talk about early animals with hard bits in their backs and four legs. They do a big change as they grow up. They start out using water to breathe and then change to breathing air. Some of them grow legs when they don't start with legs. People like to say that this means early animals with hard bits in their back and four legs also must have done a big change as they grew. But actually maybe not, because old animals with hard bits in their back and four legs don't show the big change at all. So it seems like maybe the big change either came about once before a big branch between groups, and then went away in animals with hard bits in their back that live on land, or it came about twice in two different groups of animals that do a big change as they grow, one of which might have become the living group of animals with hard bits in their back and four legs that do a big change and live in both water and on land. Both of those might have been the right answer but we can't tell right now, we need more old animals to find out. The second paper is about a animal with hard bits in its back and four legs that is close to animals with hair, but probably did not have hair. Instead it has a big back with things sticking out and skin on it. These ate other animals and were really important when they lived. But the paper looks at animals in this group that are small. It's very different too because many of these animals are found in one part of the world, but one of the small ones is found far away. It's the only one not found with all the others. The other small one is found with all the others. This paper wants to find out why are they small and do they get small in the same way, so they cut up the inside hard parts and look at them really close and find that they actually get small in different ways because they can see how they grow when they look at the inside hard parts up close. They also think that the animals that lived in the far away place from the others were small for a different reason, because the place they lived was not great and they maybe didn't have a lot of food to eat. The small ones that are found with all the other animals were small because there were all those other animals with big backs with things sticking out and skin on it that would fight it. So they probably lived more in water and ate fish, maybe. References: Pardo, Jason D., and Arjan Mann. "Direct development of stem tetrapods across the fin-to-limb transition." Science 392.6804 (2026): 1292-1296. Canoville, Aurore, et al. "Contrasting life history in the diminutive Dimetrodon species from North America and Germany." Scientific Reports 16.1 (2026): 16279.
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Podcast 336 - Who Needs a Jaw?
07/12/2026
Podcast 336 - Who Needs a Jaw?
The gang discusses two papers about jawless fishes. The first paper looks at some soft tissue preservation of early vertebrates which include preserving evidence of an ancient heart, while the second paper investigates how the fossil record of hagfish can inform the order in which characteristics evolved within the group. Meanwhile, James “solves” his problems with machines, Amanda keeps making new friends whether they like it or not, Curt claims no responsibility, and everyone loves these kawaii line drawings. Up-Goer Five (James Edition): This week the group look at two papers that are about different animals that have no legs and live in water. The first paper is about a very strange animal that lived a very long time ago that people have thought might be an early part of the group that is made up of things with hard parts inside. The paper looks at things inside the animal and show that they are made of old blood showing the parts of the animal that carried the blood and the parts that clean it. These parts suggest that the animal is in fact an early part of the group that eventually get hard parts inside. The second paper looks at three animals that are part of the group of animals that make thick wet stuff and have a mouth that does not move. They also have small eyes under the skin and live in deep places and it has been thought they show what all animals with hard parts inside used to be like. These three old animals show how the eyes have changed over time and that these animals used to have normal eyes. One of the animals is starting to get small eyes and this shows that the eyes did not get small because they lived in the dark because this one is from water that is not deep. References: Tian, Qingyi, et al. "Evidence for aorta and other blood vessels in fossil yunnanozoans from the Cambrian period." Royal Society Open Science 13.6 (2026): 260043. McCoy, Victoria E., et al. "Stepwise loss of complexity in hagfish eyes prior to deep sea colonization." Biology Letters 22.5 (2026): 20260127.
/episode/index/show/palaeoafterdark/id/42047425
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Podcast 335 - I Like Turtles
06/28/2026
Podcast 335 - I Like Turtles
The gang discusses two papers that use fossil material to assess the origin of animal groups. The first paper describes a new Early Devonian fish and its implications for the evolution of jaws, and the second paper reassesses the fossil material of turtles (and possible not turtles) to determine where turtles fit on the evolutionary tree of sauropsids. Meanwhile, James invents new flavors, Curt breaks things down, and Amanda sets boundaries. Up-Goer Five (Amanda Edition): Today our friends look at two papers that talk about things showing up for the first time. The first thing to show up for the first time are teeth. Animals with inside hard backs have teeth, but how those teeth first show up are a big question mark. Turns out that teeth first show up as not-teeth and can actually grow over each other and grow in weird ways that today's teeth can't grow in. It also turns out that these early animals with hard backs and mouths that open and close had these sort of teeth and they're pretty much from the same stuff as the teeth we have today, so these are the same thing over time. The second paper our friends look at has to do with animals with inside hard backs that also have outside hard backs. We didn't know for a long time where these animals came from. Now we know, and they look at a really old weird animal that we thought might be one of those animals with inside hard backs that also have outside hard backs. But it isn't, it is too old and has inside parts of its head that don't look right. So now we know that animals with inside hard backs that also have outside hard backs are actually closer to animals with cold blood and big long faces that sit in water all the time and attack animals that come to drink water. References: Olive, Sébastien, et al. "A new ‘acanthothoracid’placoderm from the Arctic Canada (Early Devonian) and its bearing on the evolution of jaws and teeth." Royal Society open science 12.9 (2025). Jenkins, Xavier A., et al. "The phylogenetic origin of turtles." Current Biology (2026).
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Podcast 334 - Stuck on You
06/14/2026
Podcast 334 - Stuck on You
The gang discusses two papers about encrusting organisms. The first paper looks at evolutionary patterns of bryozoans to infer environmental triggers for shifts in the ways bryozoans calcify. The second paper uses the distribution of encrusting organisms on spirifd brachiopods to infer the ecology of both the encrusters and the brachiopod they grew on top of. Meanwhile, James discovers new foods, Amanda constructs a worm, and Curt gets confused and makes it everyone’s problem. Up-Goer Five (Curt Edition): The friends talk about two papers that look at animals that do not move around much and live stuck to other animals. The first paper looks at a group of animals that grow together with their friends and grow really well on top of other things. This group makes hard parts out of stuff it gets from the water it lives in. When there are changes in ways big rocks move, this changes the types and number of things in the water that can be used to make hard parts, which can make one way of making hard parts easier than others. Most of these animals today make hard parts in the way that is not the way that is easy with how the water is today, but there are some groups that do use the easy way. This paper looks at how these groups changed over time using a family tree for the group, and they find that these groups that make their hard parts the easy way today may have started doing this when the water changed to the way it is today. The second paper looks at a group of animals with hard parts on the top and bottom that lives on the bottom of the water place and eats food by moving water into it to pull the food from the water. These animals do not move around much and they have big hard parts, so they are places where these animals that grow on top of other animals like to grow on top of. This paper looks at how these animals grew on top of these other animals to see if there are anythings that are the same or different between groups of animals that are growing over these animals. This is also used to see if we can learn things about how the animals with hard parts on the top and bottom which are having things grown on top of them are living, because some ways things grow over these animal could only happen if the animal with hard parts on the bottom and top are already dead. This paper shows that a lot of the ideas we had about how this animal with hard parts on the top and bottom lived are wrong. These animals did not change the way they sat at the bottom as they got bigger, and we know this because the parts of the animal that would be in the ground are not covered with animals that would grow on top. The only times we see these parts covered are when the animals that grow over would grow over the parts where the animal with hard parts on the bottom and the top would use to get water into to eat, which means that animal must already be dead. References: Saulsbury, James G., et al. "Evolution of skeletal mineralogy in cheilostome bryozoans from calcite to aragonite seas." Geology 53.11 (2025): 914-918. Vantoorenburg, Haley N., et al. "Palaeoecology of Middle Devonian epizoans and their Paraspirifer hosts." Palaeontology 69.2 (2026): e70050.
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Podcast 333 - Think Big
05/31/2026
Podcast 333 - Think Big
The gang discusses two papers about fossil cephalopods. The first paper uses new methods to reassess the taxonomy of what was previously considered to be the oldest octopod, and the second paper uses preserved beaks to reconstruct large body sizes of Mesozoic octopods. Meanwhile, Amanda keeps it within Michigan, James brings up THE cephalopod talk, and Curt ascends. Up-Goer Five (Curt Edition): Our friends talk about two papers that look at animals with many arms and a sharp mouth. The first paper looks at some parts of a very old animal with many arms. People thought that it might be an animal with many arms that does not have a hard home to live inside and carry around with it. But this paper looks over that animal and finds that the animal is an animal that lived in a hard home that it carried, but after it died it fell out of that home when it started to fall to pieces. The second paper looks at another animal with many arms and uses the size of the mouth to see how big the animal was. They find that these animals with many arms were very very big. They also say that this means they were really sharp which the friends talk about a lot. References: Clements, Thomas, et al. "Synchrotron data reveal nautiloid characters in Pohlsepia mazonensis, refuting a Palaeozoic origin for octobrachians." Proceedings of the Royal Society B: Biological Sciences 293.2068 (2026). Ikegami, Shin, et al. "Earliest octopuses were giant top predators in Cretaceous oceans." Science 392.6796 (2026): 406-410.
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Podcast 332 - Bird Peepin'
05/17/2026
Podcast 332 - Bird Peepin'
The gang discusses two papers that investigate phenotypic plasticity. The first paper reviews the pathways by which phenotype can be plastic, and the second paper looks at plasticity of breeding times in urban vs rural bird populations. Meanwhile, James manages a basement, Amanda names the papers, and Curt makes allegations. Up-Goer Five (James Edition): Today the group look at two papers that are interested in how animals change because of the type of place they live. The first paper is looking at different ways that animals can be changed, either by being changed as they grow or by changing things so that while the animal does not change right now its babies are different. The paper talks about how important the little bits that escape the brain to tell your body how to grow and what to make are and that many of the changes are caused by the different numbers of things escaping the brain because of the different places that the animal lives. The other paper is looking at small angry animals that fly and seeing when they lay small round quiet babies in different places. They look at when the small round quiet babies first appear in places that are built by people and places that are built by trees and also look at how this time has changed over several years during which it has gotten hotter. They find that most small angry animals that fly have their small round quiet babies earlier in places that are built by people, and also that as things have gotten hotter that also makes them have their small round quiet babies earlier. The further up they are though it seems like the time between having small round quiet babies in place built by people and places built by trees is not as much. References: Seebacher, Frank, and Alexander G. Little. "Mechanisms underlying phenotypic plasticity in response to environmental change." Biological Reviews 101.2 (2026): 713-734. Cuchot, Paul, et al. "Facing rising temperatures in urban environments: the role of phenological plasticity in an urban-dwelling passerine, Parus major." Proceedings of the Royal Society B: Biological Sciences 293.2068 (2026).
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Podcast 331 - Reef It Up
05/03/2026
Podcast 331 - Reef It Up
The gang discusses two papers that investigate ancient bioherms. The first paper looks at the formation of early Phanerozoic reefs, and the second paper investigates patterns of reef building and collapse in the late Devonian. Meanwhile, James is being advertised to, Amanda plans unique roadtrips, and Curt solicits legal advice. Up-Goer Five (Amanda Edition): Today our friends talk about animals that have green friends that make hard bits. These animals that make hard parts are really important today because they make good places for other animals to live. But we don't know all about them and where they first came from and how they first started making hard parts for places to live. So the first paper looks at where these animals that make hard parts for other animals to live in come from. They look at really early animals that make hard parts and show what kinds of places they live in, and also how they stick themselves to the bottom. It looks like different animals got started in different ways, then went out to all sorts of different places and got better at making hard parts for other animals to live in, until that was all they could do. The second paper talks about a bad time when everything died and how animals that make hard parts for other things to live in all died and tiny things we can't see without making them look big took over from them. At this time there were different animals that made hard parts for other animals to live in that lived together to make big areas of hard parts, but then they all died and never came back. But when we look at the rocks we find that tiny things we can't see without making them look big are all over the place while the animals that make hard bits for other animals to live in all die. This paper talks a lot about rocks, but the important thing is that they think the tiny things we can't see without making them look big might be the kind of thing that takes over all the places when times are bad and everything dies, but that might not be the case. References: Zhuravlev, Andrey Yurevich, and Rachel Wood. "On the origin of metazoan reefs." Proceedings of the Royal Society B: Biological Sciences 293.2068 (2026). Xinsong, Zhang, et al. "How microbes replaced metazoans in reef ecosystem during the Late Devonian mass extinction: new insights from platform facies in South China." Lethaia 58.4 (2025): 1-22.
/episode/index/show/palaeoafterdark/id/41133850
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Podcast 330 - Dinosaur Body Pillow
04/19/2026
Podcast 330 - Dinosaur Body Pillow
The gang discusses two papers about the functional morphology of ancient groups of animals. The first paper is a review of how the life position of rangeomorph ediacaran taxa have been reconstructed, and the second paper conducts an actualistic experiment of Oviraptor nesting strategies. Meanwhile, Curt gets activated, James doesn’t die, and Amanda relishes in details. Up-Goer Five (James Edition): The group look at two papers that focus of understanding how things are long dead lived. The first paper talks about strange things that might have either lived standing up or lying down at the bottom of the water which is big and you can not drink. It is hard to tell how these things lived because there are not any around today and so instead we need to look at their form and how they are found in the rock. Most of the things seem to have lived how we thought but one actually was lying down rather than standing up. The second paper looks at how big angry animals without hair kept their round babies and helped them grow by making a form in the ground like they used and putting round babies in it. They looked at how the round babies did by themselves and how they did with a warm bag on top like their final big form. They decide that they probably had the final big form covering the round babies when they were growing but that they did not do it the same was a things that fly and do not have hair today. References: McIlroy, Duncan. "Determining the mode of life of Ediacaran rangeomorphs in deep marine settings of Peri-Gondwanan Avalonia." Assemblage 550.538Ma (2022). Su, Chun-Yu, et al. "Heat transfer in a realistic clutch reveals a lower efficiency in incubation of oviraptorid dinosaurs than of modern birds." Frontiers in Ecology and Evolution 14 (2026): 1351288.
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Podcast 329 - Boom Shakalaka
04/05/2026
Podcast 329 - Boom Shakalaka
The gang discusses two papers that use quantitative methods to investigate the biomechanical limitations of extinct organisms. The first paper models the range of jumping potential for a non-avian theropod dinosaur, and the other paper tests if an extinct bird could have skimmed the ocean for food. Meanwhile, James imagines a better future, Amanda is to blame, and Curt is heating up. Up-Goer Five (Amanda Edition): Today our friends look at two papers that talk about how things do stuff. The first paper looks at how a small one of large animals with thick skin and no hair would jump. It would jump very different than living animals with not thick skin with pieces that come off and have many parts. This is because they have long back parts that would get in the way and so they have to jump different. They could probably jump well, but just very different. The paper has very funny pictures that show this. The paper also has a computer do a pretend living animal with not thick skin with pieces that come off and have many parts, but they do not look at any living animals, just what the computer does. The second paper looks at very big not living animal with not thick skin with pieces that come off and have many parts, that has not real teeth in its mouth and shows that it could not live like some living animals with not thick skin with pieces that come off and have many parts that have very long faces and the bottom part of their mouth is much longer than the top part. They go over water and use their mouth to eat things that live in water. But the not living animal with not thick skin with pieces that come off and have many parts was too big and too bad at flying to do this kind of living. References: Hellyer-Price, Olivia, Chris Venditti, and Stuart Humphries. "The largest extinct volant bird Pelagornis could not meet the energetic demands of skimming." Royal Society Open Science 13.2 (2026). Charles, James P., Delyle T. Polet, and John R. Hutchinson. "Form–function relationships determining optimal jumping performance in an early bipedal dinosaur." Journal of The Royal Society Interface 23.235 (2026).
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Podcast 238 - Fins for Days
03/22/2026
Podcast 238 - Fins for Days
The gang discusses two papers that are united by a fin. The first paper uses a computer algorithms to infer the shape of mosasaur tail fins, and the second paper looks at a new species of Spinosaurus with a crest. Meanwhile, James tastes flavor, Amanda tastes drink, and Curt tastes indifference. Up-Goer Five - SERVER NOT FOUND! HELP! References: Song, Yang, and Johan Lindgren. "Convergence in aquatic locomotion: reconstructing mosasaurian (Squamata: Mosasauria) tail fins from osteological correlates and covariation with extant sharks." Paleobiology 52.1 (2026): 121-130. Sereno, Paul C., et al. "Scimitar-crested Spinosaurus species from the Sahara caps stepwise spinosaurid radiation." Science 391.6787 (2026): eadx5486.
/episode/index/show/palaeoafterdark/id/40569755
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Podcast 327 - Horse or Deer?
03/08/2026
Podcast 327 - Horse or Deer?
The gang talk about two papers about extraordinary dinosaur fossils and the unique information that can be gleaned from them. The first paper looks at fossil skin data on a Cretaceous iguandodontian, and the second paper uses an exceptionally complete specimen to demonstrate the reality of Nanotyrannus. Meanwhile, James classifies, Amanda imagines T-rex, and Curt brings a unique energy. Up-Goer Five (Curt Edition): The friends look at two papers about big angry animals that everyone loves to talk about. The first paper is about the skin of one of these big angry animals. This skin has weird bits on it that are not like the weird bits we see in a lot of other animals that are close to these big angry animals. These bits do not look like the bits that would be used to stay warm or to move into the air. These bits look like they might hurt. The second paper looks at a lot of stuff from one big angry animal that has been said by people in the past is just a young one of another big angry animal. The paper looks at the parts of this animal, how this animal grew, and a lot of other things to show that, no, this animal is not this other animal. This animal is its own type of animal. References: Huang, Jiandong, et al. "Cellular-level preservation of cutaneous spikes in an Early Cretaceous iguanodontian dinosaur." Nature Ecology & Evolution (2026): 1-8. Zanno, Lindsay E., and James G. Napoli. "Nanotyrannus and Tyrannosaurus coexisted at the close of the Cretaceous." Nature (2025): 1-3.
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Podcast 326 - But What Is It?
02/22/2026
Podcast 326 - But What Is It?
The gang discuss two papers of odd fossils with exceptional preservation. The first paper looks at some Cambrian vertebrates and shows that soft tissue evidence suggests the presence of two sets of camera eyes (four eyes total), and they interpret the additional set of camera eyes as being a homolog to the modern parietal eye in vertebrates. The second paper uses exceptional preservation of the Rhynie Chert to test hypotheses for the taxonomic placement of the enigmatic Prototaxites and finds evidence that suggests it is not, as previously suggested, a fungus. Meanwhile, James is marooned by weather, Amanda accidentally traumatizes her cat, and Curt imagines the flesh trees. Up-Goer Five (Curt Edition): The friends talk about things that are weird. The first paper looks at a thing that is part of the big group that we are all a part of but is from a long long time ago and lived in the big blue wet thing. This thing has four eyes. Two of those eyes might be the things that become a part of the brain that is not the eyes today. But this shows that, early on, some of these animals could have had four eyes. This also means some animals we see later could have had parts of these other eyes that we have thought were other things. The second paper looks at a thing that is weird that people thought was from a group that is not an animal but has some animal like things like eating other things but has walls in the cells. These weird things are from a long time ago and come from a place where the parts were saved from breaking down by glass getting inside the cells. This means you can see lots of cell stuff, and you can also break down the glass to get at some of the cell bits. This paper looks at a lot of this weird thing and they say that it is not part of the group people thought it was from. In fact, it is so weird that it is not like any group we have today. It is maybe something that is not around today that we did not know about. References: Loron, Corentin C., et al. "Prototaxites fossils are structurally and chemically distinct from extinct and extant Fungi." Science advances 12.4 (2026): eaec6277. Lei, Xiangtong, et al. "Four camera-type eyes in the earliest vertebrates from the Cambrian Period." Nature (2026): 1-6.
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Podcast 325 - The Curse of the Not Cat
02/08/2026
Podcast 325 - The Curse of the Not Cat
Listeners, I’m going to level with you. This podcast is cursed. Not because of the content, which is mostly a pretty straight forward discussion about two papers that look into the fossil record of Nimravids (early cats that are not true cats). No, this podcast is cursed because the file refused to be compiled, crashing Audacity 3 times and each time corrupting the save file. The fact that any mp3 file was able to be compiled at all was a minor miracle. I can only assume that this means this podcast data has gained sentience and did not want to be born. I have no control over what happens when this mp3 file gets released into the internet… so anyways enjoy the episode! Up-Goer Five (Curt Edition): The friends talk about two papers that both look at things we can see in the hard parts of animals that are like cats but are not cats and use those hard parts to figure out what these not cats are doing. These papers looks at different not cats and try and see what types of food they would eat and how they would get that food. Turns out that many of these not cats were doing things that are not the same as the cats we have today. References: Castellanos, Miguel. "Hunting types in North American Eocene–Oligocene carnivores and implications for the ‘cat-gap’." Journal of Mammalian Evolution 32.2 (2025): 25. Jiangzuo, Qigao, et al. "A new ecomorph of Nimravidae, and the early macrocarnivorous niche exploration in Carnivora." Proceedings of the Royal Society B: Biological Sciences 292.2059 (2025).
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Podcast 324 - Pick Up the Pieces
01/25/2026
Podcast 324 - Pick Up the Pieces
The gang discusses two papers that use fragmentary fossils of animals to investigate the origins of major groups. The first paper describes an Early Ordovician eurypterid, and the second paper looks at mosaic evolutionary patterns in an early squamate. Meanwhile, James has bird opinions, Curt delights in not knowing, and Amanda will definitely be on time. Up-Goer Five (Curt Edition): The friends look at two papers that are using broken bits of things to learn a lot about animals from a long time ago. Both of these papers are looking at old animals that may give us new looks at how big groups of animals changed over time. These animals may be some of the first animals in these groups, or at least let us know what kinds of things those early animals could have been doing. The first paper looks at a group of animals that lived in the big blue wet thing a long time ago and are part of a group that today has animals that make homes that they use to catch food. The new parts this paper finds shows that this group may have come around a lot earlier than we thought. The second paper looks at parts from an animal that is in a group that is cold and has hard skin, some with legs and some without legs. These parts show that the early animals in this group had a lot of changes going on in their hard parts, maybe they changed more early on then they do today. References: Benson, Roger BJ, et al. "Mosaic anatomy in an early fossil squamate." Nature (2025): 1-7. Van Roy, Peter, Jared C. Richards, and Javier Ortega-Hernández. "Early Ordovician sea scorpions from Morocco suggest Cambrian origins and main diversification of Eurypterida." Proceedings of the Royal Society B: Biological Sciences 292.2058 (2025).
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Podcast 323e - "All Sales Final" Part 5 - Another Satisfied Customer
01/11/2026
Podcast 323e - "All Sales Final" Part 5 - Another Satisfied Customer
The crew of the CS Perry struggle to extract themselves from their rapidly deteriorating situation. "Lightless Dawn" , "Spacial Harvest", and "Crypto" from Kevin MacLeod () Licensed under Creative Commons: By Attribution 3.0
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Podcast 323d - "All Sales Final" Part 4 - The Milk Run
01/04/2026
Podcast 323d - "All Sales Final" Part 4 - The Milk Run
The crew of the CS Perry, now trapped in a space station run by multiple hostile AI, work to figure out how best to salvage a mission gone very wrong. "Lightless Dawn" and "Crypto" from Kevin MacLeod () Licensed under Creative Commons: By Attribution 3.0
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Podcast 323c - "All Sales Final" Part 3 - The Hard Sell
12/28/2025
Podcast 323c - "All Sales Final" Part 3 - The Hard Sell
The crew of the CS Perry begin the negotiation process for the CA-chip, but the sales team wants an arm and a leg for the product. "Lightless Dawn" and "Crypto" from Kevin MacLeod () Licensed under Creative Commons: By Attribution 3.0
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Podcast 323b - "All Sales Final" Part 2 - A Representative Will Be With You Shortly
12/21/2025
Podcast 323b - "All Sales Final" Part 2 - A Representative Will Be With You Shortly
The crew of CS Perry were offered the perfect deal, a quick stop at an abandoned spaceport to grab some mothballed tech and they'd be set for life. What could possibly go wrong? "Lightless Dawn" from Kevin MacLeod () Licensed under Creative Commons: By Attribution 3.0
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Podcast 323a - "All Sales Final" Part 1
12/14/2025
Podcast 323a - "All Sales Final" Part 1
For our holiday episodes this year, James, Curt, Amanda, and Ants get together to play a game of the space horror tabletop RPG Mothership. Join us for our introductory episode where we discuss the setting, rules, and the main characters of our story. "Lightless Dawn" from Kevin MacLeod () Licensed under Creative Commons: By Attribution 3.0
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Podcast 322 - Obligatory Dinosaur Podcast 3: Dino With a Vengeance
11/30/2025
Podcast 322 - Obligatory Dinosaur Podcast 3: Dino With a Vengeance
The gang discusses two papers that are about dinosaurs, and that is all that connects them! The first paper investigates community structure during the Cretaceous, and the second paper describes a well preserved “mummy” of a duck-billed dinosaur. Meanwhile, Amanda is doing well (really she is now), Curt makes an awkward segue, and James has not seen Tremors. Up-Goer Five (Curt Edition): The friends talk about two papers about big angry animals from a long time ago. The first paper looks at how many types of big angry animals were in a place before something bad happened and all the big angry animals died. Lots of people have said that the big angry animals might have been in trouble before the bad thing happen, and lots of other people say that they were probably not in trouble but we just don't have a lot of places that have the big angry animals in them for us to look and see what is happening at that time. This paper looks at a place and shows that it was during the time we want to see and that the types of animals in a place were a lot like the types of animals in a place before, so that means that it does not look like these big angry animals were having a bad time before the bad thing happened. The second paper looks at soft parts of a big angry animal that was dried out so that you can see skin and other bits under the skin. This lets the people find out what the feet look like for this animal, and other bits about how it moved. References: Flynn, Andrew G., et al. "Late-surviving New Mexican dinosaurs illuminate high end-Cretaceous diversity and provinciality." Science 390.6771 (2025): 400-404. Sereno, Paul C., et al. "Duck-billed dinosaur fleshy midline and hooves reveal terrestrial clay-template “mummification”." Science (2025).
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Podcast 321 - Getting Mostly Stems Here
11/16/2025
Podcast 321 - Getting Mostly Stems Here
The gang discusses two papers that have very little in common with each except for the word “stem”. The first paper uses birth death models to simulate the fossil record in order investigate if neutral models can produce patterns similar to the “crown”/“stem” evolutionary dynamics that have been observed in real data. The second paper investigates stem mandibulate fossils to investigate the timing of major key innovations in the evolutionary history of this arthropod group. Meanwhile, Amanda decides, James bullies, and Curt explains. Up-Goer Five (Curt Edition): The friends talk about two papers that have very little to do with each other, other than the fact that they have one of the same words in them. The first paper looks at the ways in which animals change over time and how they make more of each other and how the ways things live and die can make it look like there are some groups that do better than others. The paper shows that some of this is something we should see even if it is just because of how things make more things and the fact that we care more about the things that live today than the things that do not live today. The second paper looks at how animals that have many parts that repeat make their arms and legs. This paper looks at very very old animals from groups that are not around today but maybe could be close to those groups. The group of animals today that this group is close to has a lot of things that all of them share, like that they make mouths from a lot of arms, and also they have things on the front they use to feel things, and that they are three parts. This paper is using these old animals that are close to this group to try and see which things today in this group appeared first, and which things may have taken some time before they appeared. References: Budd, Graham E., and Richard P. Mann. "The dynamics of stem and crown groups." Science Advances 6.8 (2020): eaaz1626. Liu, Yao, et al. "A tiny Cambrian stem-mandibulate reveals independent evolution of limb tagmatization and specialization in early euarthropods." Scientific Reports 15.1 (2025): 19115.
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Podcast 320 - von Herrerasaurus
11/02/2025
Podcast 320 - von Herrerasaurus
The gang discusses two papers that investigate injuries in fossil bones. The first paper tests hypotheses about the causes of facial injuries in herrarasaurids, and the second paper tests if inferred hunting strategies map onto injury patterns in predators from the La Brea Tar Pits. Meanwhile, Curt provides some hypotheses, Amanda gets spiritual, and James is photogenic. Up-Goer Five (Curt Edition): The friends talk about two papers that look at why animals from a long time ago got hurt. The first paper looks at some very old and angry animals with no hair that all got hurt in the face. They try to see why these animals got hurt in the face. They look at all the ways that they could have got hurt in the face and find that it was probably other animals just like them that they lived with that probably hurt them in the face. The second paper looks at two groups of animals that eat other animals. One group of animals is man's best friend, and the other group of animals is from a group that does not care if man lives or dies. Since these two groups of animals are old and from a long time ago we don't know really what they ate but we use other things to come up with thoughts on how they could eat. We look to animals today that are like these animals and think that maybe these old animals ate the same way. But, trying to eat other animals is hard and can get you hurt, and you can get hurt in a lot of the same ways if you jump or run. This paper looks at how they got hurt to see if this fits with how we think they would eat. Turns out that the ways they were hurt makes sense if they ate way we think they ate, with man's best friend running and man's not best friend running. References: Garcia, Mauricio S., Ricardo N. Martínez, and Rodrigo T. Müller. "Craniofacial lesions in the earliest predatory dinosaurs indicate intraspecific agonistic behaviour at the dawn of the dinosaur era." The Science of Nature 112.2 (2025): 1-12. Brown, Caitlin, et al. "Skeletal trauma reflects hunting behaviour in extinct sabre-tooth cats and dire wolves." Nature Ecology & Evolution 1.5 (2017): 0131.
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Podcast 319 - CSI Crato Formation
10/19/2025
Podcast 319 - CSI Crato Formation
The gang discusses two papers that use taphonomic experiments to test hypotheses about the paleo-environmental conditions of the Crato Formation. Meanwhile, Amanda has her daily requirements, James longs for the rack, Curt launched a new podcast concept, and no one on this podcast can keep to a topic for longer than five minutes. Up-Goer Five (Curt Edition): The friends talk about two papers that look at rocks that come from the same place. This place is a spot where you get a lot of soft things from animals in the rocks which would usually not be able to be in the rocks because they would get broken up and lost. These two papers look at the types of animals we see in these rocks to see if that can tell us about the place where these animals with very soft parts were able to be saved. The first paper looks at small animals with many legs that stick their food with points on their mouth. When these animals die their legs are pulled under them. But in these rocks, the legs are not like that. The people who wrote this paper took some of these animals and put them in water and also water with stuff in it that you put on food and makes food good to eat. They found that the animals in the water with the stuff that makes food good had legs that look like looked like the rocks. This would mean that these animals were in water that had this stuff in it. The second paper looks at other small animals with soft things. These animals need to live in water and would not do well if the water had the stuff in it that the other paper said it did. Some people have said that maybe this means the animals got put in here and did not live in here. So the people who wrote this paper took dead animals and shook them to make it like they were moved to see what happened. They found that they could not have been moved because they break up easy when you try to move them. This means that the water must have had some times when it was just water and some times when the water had lots of stuff in it that makes food good. References: Downen, Matt R., Paul A. Selden, and Stephen T. Hasiotis. "Spider leg flexure as an indicator for estimating salinity in lacustrine paleoenvironments." Palaeogeography, Palaeoclimatology, Palaeoecology 445 (2016): 115-123. Storari, Arianny P., et al. "Taphonomy of aquatic insects from the Crato Formation Lagerstätte (Aptian, Lower Cretaceous) under an actualistic look." Plos one 20.9 (2025): e0331656.
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Podcast 318 - Derp Fish Returns
10/05/2025
Podcast 318 - Derp Fish Returns
The gang discusses two papers that provide nuanced information to test when key innovations in vertebrate evolution occurred. The first paper looks at unique semi-terrestrial trace fossils in the early Devonian in order to determine the trace maker, and the second paper looks at fossils that could provide information about the origins of teeth. Meanwhile, Curt has theme park ambitions, James provides Amanda with new anxieties, and Amanda leaves it all to chance. Up-Goer Five (James Edition): The group talk about two papers that are looking at the earliest time things have been seen in the rocks. The first paper looks at some tracks in the rock left by animals with no legs that live in the water but can gasp air. We have looked at tracks from the same place before where the animals stuck their faces into the ground. The new tracks come in two forms. The first is where the animal took a rest and its bits that it uses to move in the water stuck in the ground. The other track is where it had to come out of the water and moved around on land. It used its head to pull it along as it moved. The track made by this is the same as tracks made by the same type of animal that still lives today. This is the oldest case of this type of animal moving on land and shows that animals with hard parts inside them began to move onto land in lots of different ways. The other paper looks at the supposed earliest time we find teeth growing on skin. This is interesting because there are several ideas about why the teeth began to grow on the skin, so when it first started could help tell which of these reasons is true. The skin teeth bit has been considered the same as an animal with no legs that lived in the water that was found in younger rocks from a different place, but when studied up close it does not look like the thing it is named as. By using lights to look inside the rock and seeing whether it looks the same as skin teeth on living animals it is shown that the old skin teeth are not skin teeth at all but actually are parts of the skin of a different animal with no hard parts inside that has legs that move in many places. References: Haridy, Yara, et al. "The origin of vertebrate teeth and evolution of sensory exoskeletons." Nature (2025): 1-6. Szrek, P., et al. "Traces of dipnoan fish document the earliest adaptations of vertebrates to move on land." Scientific Reports 15.1 (2025): 28808. Falkingham, Peter L., and Angela M. Horner. "Trackways produced by lungfish during terrestrial locomotion." Scientific Reports 6.1 (2016): 33734.
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Podcast 317 - Bring the Brain Power
09/21/2025
Podcast 317 - Bring the Brain Power
The gang discusses two papers that deal with fossil brains. The first paper looks at a fossil arthropod from the Cambrian and uses neurological characters to determine its phylogenetic placement. The second paper looks at a synapsid braincase and tries to infer why this one species has lost its parietal eye when other members of the species have he eye. Meanwhile, Curt invents some new sponsors, Amanda has plans for James, and James discusses some personal growth. Up-Goer Five (Curt Edition) The friends talk about two papers that look at very old brains in animals that are long gone. The first paper is the brain of animal from a very long time ago that would grow by taking off its skin when it needs to get bigger and is made of many small bits stuck together. This animal was really weird for a long time, but the people who wrote this paper found one of them that had its brains still in it. They looked at the brains and they looked at the brains of other animals from the past and animals around today and they saw that this brain looked a lot like the brains of a group around today that some of the animals make things to catch food and live in out of their bottom. So the people who wrote the paper say this could mean that is maybe a very very very old animal from that group or close to it. The second paper looks at the hard bits that hold the brain in for an animal that is close to the animals today that have hair and are warm. This animal may not have had hair and may not have been warm, but what the people who wrote the paper are looking at is the spaces in the hard bits that hold the brain. In animals that do not have hair and are cold, there is a space at the top of the head for an eye that can see light and dark. In animals that are warm, they lose this eye. The old animal they are looking at has some animals in the group that have that eye who live in cold places. The animal they are looking at does not have this eye, and so the question is why? They look at everything and they think that it is because the animal without the eye lives in places that are always warm and where day and night don't change that much. This would mean they would not need this light dark eye as much. References: Strausfeld, Nicholas J., David R. Andrew, and Frank Hirth. "Cambrian origin of the arachnid brain." Current Biology 35.15 (2025): 3777-3785. Benoit, Julien, and Jaganmoy Jodder. "The palaeoneurology of a new specimen of the Middle Triassic dicynodont synapsid Kombuisia frerensis." Acta Palaeontologica Polonica 70.2 (2025): 369-374.
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Podcast 316 - Sail Back Bros
09/07/2025
Podcast 316 - Sail Back Bros
The gang discusses two papers about skin preservation in fossil tetrapods. The first paper describes skin impressions from a Permian synapsid, and the second paper identifies feather-like structures in an early Triassic diapsid. Meanwhile, James considers the horse, Amanda shames extinct animals, and Curt quotes “philosophy”. Up-Goer Five (Amanda Edition): Today our friends talk about things that are sort of close to things with hair but not that close to things with hair. They are closer to things with hair than to things with dry skin with no hair or long many-part skin things. Anyway for a long time we did not know what the skin of the animals that are sort of close to things with hair looked like. Did they have dry skin with no hair like the things today? Or did they maybe have hair? We didn't know, but now we have found marks in the ground that show that they had dry skin with no hair, but it looks different than the animals with dry skin and no hair today. So hair comes around after the dry skin with no hair does. Then our friends talk about a very weird little animal that is sort of somewhere close to animals with dry skin and no hair, but it has these really weird things that come off of its back that look kind of like the many-part skin things on the most flying animals that are around today. But it's really not the same many-part skin things, because all the parts are not really same. And also there is only one of them and not one on each side. So it might be that many-part skin things come earlier than people thought they might have. References: Marchetti, Lorenzo, et al. "Early Permian synapsid impressions illuminate the origin of epidermal scales and aggregation behavior." Current Biology 35.11 (2025): 2752-2759. Spiekman, Stephan NF, et al. "Triassic diapsid shows early diversification of skin appendages in reptiles." Nature (2025): 1-7.
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Podcast 315 - Final Transmission from the Black Lodge
08/24/2025
Podcast 315 - Final Transmission from the Black Lodge
The gang ends “Wet Hot Archosaur Summer” with the final podcast recorded from our undisclosed location in the woods. For this podcast, we indulge Amanda by talking about birds and trace fossils. The first paper looks at the remains of nesting sites that date back to the Cretaceous, and the second paper investigates sources of error in estimates of avian maximum speeds from trace fossils. Meanwhile, Amanda has a message for the bears, James proposes an alliance with the crows, and Curt does an “homage”. Up-Goer Five (Curt Edition): The friends talks about two papers that will make one of them very happy because they are all about the ways that animals that fly can make marks on the ground to let us know about how they move. The first paper looks at where these animals that fly will make their home. This paper shows that animals that fly have been found in this cold place near the top of the world for a really long time. This place would not have been as cold as it is today, but would have been dark for half the year. Some of the animals they find in this area look like they would have moved in when things were good and left when things got bad. This is something we see animals that fly do today in the top of the world as well. The second paper looks at how we try and use how these animals make marks on the ground to see how fast they would move. The paper shows that the way we were doing it in the past kind of worked, but also didn't work. This is because when these animals that can fly move, they do not move in the same way as other animals all the time. And so the way that these things walk is important if we want to try and understand more about how fast they could move from the marks on the ground. References: Wilson, Lauren N., et al. "Arctic bird nesting traces back to the Cretaceous." Science 388.6750 (2025): 974-978. Prescott, Tash L., et al. "Speed from fossil trackways: calculations not validated by extant birds on compliant substrates." Biology Letters 21.6 (2025): 20250191.
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Podcast 314 - Weird Archosaur Summer
08/10/2025
Podcast 314 - Weird Archosaur Summer
The gang is all back together in one place again as they unite in an undisclosed cabin in the woods to record the last two podcasts for Wet Hot Archosaur Summer. For this episode, the gang talks about herbivorous pterosaurs and wadding T-rex. Meanwhile, James experiences relative sobriety, Curt welcomes everyone to the Great Northern, Amanda is fueled by spite, and we all get completely off track. Up-Goer Five (Curt Edition): The friends are together for the first time in a long time and so they have a lot of fun together and sometimes they talk about a paper or two. The first paper that they sort of talk about is about big angry animals that fly and are no longer around. This paper looks at one group of these big angry animals and finds that they have bits and pieces of things that are found in green things that make their own food from the sun. They do a lot of things to make sure that these bits are found inside these animals and they use this to say that this one group of big angry animals probably ate these green things. The second paper looks at how big angry animals moved and how fast they could move in air or in water. This is because some big angry animals that are in all of the movies are said to maybe not be as fast as the things they would eat. This paper says maybe they chased food into water where they would be faster. The friends point out that other animals today do not have to be faster than the animals they eat, but sure... go off. References: Blanco, R. Ernesto. "Tyrannosaurus rex runs again: a theoretical analysis of the hypothesis that full-grown large theropods had a locomotory advantage to hunt in a shallow-water environment." Zoological Journal of the Linnean Society 198.1 (2023): 202-219. Jiang, Shunxing, et al. "First occurrence of phytoliths in pterosaurs-evidence for herbivory." Science bulletin (2025): S2095-9273.
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Podcast 313 - Ooooo Banana
07/27/2025
Podcast 313 - Ooooo Banana
Wet Hot Archosaur Summer continues as the gang discusses two papers that look at the evolution and biogeography of early archosaurs. Specifically, one paper describes new material from an early dinosaur group, and the other paper looks at the niche preferences of early pterosaurs and their closest sister group, the lagerpetids. Also, James tries out a new flavor, Curt likes consistency, and Amanda provides some ASMR. Up-Goer Five (Curt Edition): The friends look at two papers about the early types of animals that would give us lots of different types of big angry animals like the big ones that everyone thinks of and the ones that can fly. The first paper looks at one of these early animals which we don't know much about because there is not a lot of it left. This paper talks about some new stuff that was found which helps us better know what this animals is. We first thought that maybe it was one of the earliest animals, but this paper says that it may be more like some of the big animals that we talk about all the time because they are in big movies like the one that came out this year. The second paper looks at two groups of animals that are close to each other, one of them can fly and one that does not fly. These two groups were around at the same time. This paper looks to see where they lived and what types of places they wanted to live in. They find that these two groups did live sort of the same place, but places where the things that fly would like to live were also places that the other group that did not fly did not like to live as much. The other thing they find is that, even though the group that did not fly was not as long lived as the group that did fly, during the time they are looking at it lived in a lot of places and did very well. A big bad thing happened at the end of this time that is probably why this group went away and the group that could fly was able to do better. References: Müller, Rodrigo Temp. "A new “silesaurid” from the oldest dinosauromorph-bearing beds of South America provides insights into the early evolution of bird-line archosaurs." Gondwana Research 137 (2025): 13-28. Foffa, Davide, et al. "Climate drivers and palaeobiogeography of lagerpetids and early pterosaurs." Nature Ecology & Evolution (2025): 1-14.
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Podcast 312 - Sick Skateboard Tricks
07/13/2025
Podcast 312 - Sick Skateboard Tricks
The gang discusses two papers about the ecology of sauropods. The first paper investigates the biomechanics of the Plateosaurus tail, and the second paper looks at direct evidence of sauropod diet from gut contents. Meanwhile, James “makes it interesting”, Amanda may have recorded on the wrong microphone, Curt makes a bold rebrand, and everyone vaguely remembers “Denver: The Last Dinosaur”. Up-Goer Five (Curt Edition): The friends talk about two papers that look at animals with along necks from a long time ago that kids love and were in a movie where one of them called Little Foot went to a great low place between big places. The first paper looks at one of the oldest groups of animals with long necks that had really long things coming out of their bottoms. Some animals use these long things to match how heavy and long their necks are, but some use these long things to hit other animals. Since this group did not have a lot of things to hit other animals that may try to eat them, it would make sense that maybe they used their long things off their bottom to do it. They look at other animals from today and the past to see if this animal could use its long thing from its bottom to hit other animals. And they find that it could. The second paper looks at what one of these long neck animals would eat. They find some parts of one of these animals that died when it was eating, and the bits that it ate were still in its body when it died. They find bits and pieces of things that can make their own food, and they also find that the animal was not very good at breaking up its food in its mouth. References: Poropat, Stephen F., et al. "Fossilized gut contents elucidate the feeding habits of sauropod dinosaurs." Current Biology 35.11 (2025): 2597-2613. Filek, Thomas, et al. "Tail of defence: an almost complete tail skeleton of Plateosaurus (Sauropodomorpha, Late Triassic) reveals possible defence strategies." Royal Society Open Science 12.5 (2025): 250325.
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