The gang discusses two papers that look at the evolutionary impact of shifts in habitat occupation. The first paper looks at a clade of sharks moving into the depths, and the second paper investigates habitat shifts in mammals across the Cretaceous and Paleogene. Meanwhile, Amanda has some opinions, James is doing much better, and Curt is easy to amuse.

 

Up-Goer Five (Curt Edition):

The friends talk about two papers that look into how animals change when they move from one type of place to another. The first paper looks at animals with big teeth that has soft parts inside and live in the water. One group of these animals is found in really deep water today, but in the past they were found in water that is not deep. This paper looks at when this move into the deep happened, and what it happened along with.

The second paper looks at parts of animals that have hair and how these parts have changed over time. These parts are used for moving around and so they can let us know how these animals were moving in the past. This paper shows that before a really bad thing happened, a lot of these animals were moving in the trees, but after that big thing happened these animals were moving in a lot more different ways with more on the ground.

 

References:

Marion, Alexis FP, Fabien L. Condamine, and Guillaume Guinot. "Bioluminescence and repeated deep-sea colonization shaped the diversification and body size evolution of squaliform sharks." Proceedings B 292.2042 (2025): 20242932.

Janis, Christine M., et al. "Down to earth: therian mammals became more terrestrial towards the end of the Cretaceous." Palaeontology 68.2 (2025): e70004.