Sun, 27 March 2022
The gang discusses two taxonomy papers about dinosaurs, fulfilling their contractual obligation to produce one dinosaur-centric podcast every 8 to 10 years. The first paper finds strong evidence to support the validity of Torosaurus as a genus separate from Triceratops and is quite cool. The second paper is that awful T-rex paper from about a month ago. Meanwhile, Curt remembers too much, Amanda enjoys self-righteous fury, James goes too far, and we all get way too drunk and rambley for our own good. CONTENT WARNING: This episode gets very salty and pushes past our usual frequency of just a few expletives per podcast. You have been warned.
Up-Goer Five (Curt Edition):
Our friends talk about two papers that look at big angry animals with no hair from the past. The first paper looks at a type of big angry animal that had a big thing coming out of the back of its head. There are a lot of these types of animals, but there are two of these types that have been a problem for some time. Some people think that these two types are two different things. However, some other people think that there is just one type and we are seeing the same animal get old and calling that old animal a new type that isn't real. This paper looks at some new parts from this other type that some people think is just one type that is old. They find that the parts show the animal was not old by looking at how the hard parts grow. This means that the two types have to be different and not the same. They also talk about the other parts of the animal that do not make sense if these two types are the same. So they show that we should instead see these as two different types of angry animals with a big thing coming out of the back of their heads.
The second paper is bad and no one should read it.
Paul, Gregory S., W. Scott Persons, and Jay Van Raalte. "The Tyrant Lizard King, Queen and Emperor: Multiple Lines of Morphological and Stratigraphic Evidence Support Subtle Evolution and Probable Speciation Within the North American Genus Tyrannosaurus." Evolutionary Biology (2022): 1-24.
Mallon, Jordan C., et al. "The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications." Zoological Journal of the Linnean Society (2022).
Direct download: Podcast_232_-_Obligatory_Dinosaur_Podcast_2_Dino_Harder.mp3
Category:general -- posted at: 3:00am EDT
Sun, 13 March 2022
The gang celebrates their 9th podcast birthday with a discussion on evolutionary rates. The first paper looks at how rates of body size evolution vary across lepidosaur lineages, and the second paper looks at how biotic and abiotic factors control freshwater gastropod diversification. Meanwhile, James finds a murder basement, Amanda has a unique diet, and Curt remembers.
Up-Goer Five (Curt Edition):
Our friends talk about two papers that look at how and why animals change over time, and how those changes can be fast or slow and what makes those changes fast or slow. The first paper looks at how a group of animals with four legs who are cold and looks to see if the way they get big or small changes over time. Some groups of these animals have a lot of change in how big they are really early on, but there is another group that does really well that has a very slow change in how big they get over time. There is one point where this is not the case, and that is when a group of these animals that usually get big slowly moves into the water. These animals in the water get big very quickly.
The second paper looks at animals who make a home for themselves out of hard stuff and live in water you can drink and how the world around them and also the other animals can change how many new animals appear over time. The paper finds that lots of things control how many new animals appear, but some things that are always important are the number of other animals of this type and also how different the ground is. This paper even looks at how water can move over the ground in the past to figure out how the places where these animals would live change over time.
Neubauer, Thomas A., et al. "Drivers of diversification in freshwater gastropods vary over deep time." Proceedings of the Royal Society B 289.1968 (2022): 20212057.
Herrera‐Flores, Jorge A., et al. "Slow and fast evolutionary rates in the history of lepidosaurs." Palaeontology (2021).