The Mini Dimtrodon

Publication Info:

Transcript:

Aurore Canoville et al, Contrasting life history in the diminutive Dimetrodon species from North America and Germany, Scientific Reports (2026). DOI: 10.1038/s41598-026-52199-y

Why are there two miniature species of Dimetrodon from two very different parts of the world? Some new research is giving paleontologists some hints about how and why they grew so differently.

Episode 295

Notes:

Do you know there was a pet-sized Dimetrodon? There there were actually two. And now paleontologists may have at least some idea why. Here's your most recent paleontology news almost daily or whenever I get around to it. So, Dimetrodon is at least one of the most famous prehistoric non-dinosaurs. Big part of that is because they got included in a lot of dinosaur toy bags when a lot of us were kids. And they're definitely not dinosaurs even though they they kind of look like it. And Dimetrodon did really well on our planet. It was a crazy diverse genus with some species getting to 10-plus feet. But, the smaller species like Dimetrodon teutonis barely got above 2 feet. And keep in mind, that's including its tail. So, we're talking kind of an average-size small iguana. Another species, natalis, barely got above 5 and 1/2 feet. So, still kind of in that iguana range. It's always weird when you have variation like that within a genus, especially when the smallest animals come from very different environments. With natalis being from North America in a complex and full food web that it was a part of, not on top of. It was definitely prey as much as it was predator. And teutonis being from Germany in an environment where it probably was the apex predator and probably struggled because there was a ton of drought and there was only really seasonal food. Well, paleontologists were recently able to take a look at bones from both species using various kind of age indicators like but not limited to lines of arrested development or growth. And found that both species, even inside the same genus, grew completely differently. With natalis living in this rich food web in North America and having plenty of predators, grew to its maximum size extremely quickly, potentially meaning that it could reproduce that much faster. While teutonis in Germany grew to even its smaller size much slower, probably because its environment experienced extreme droughts and it would have had limited resources for a good chunk of the year, meaning its body had to really conserve what it had. And both of these indicate that probably part of the reason Dimetrodon in general did so well is because it could adapt so easily to different environments. As usual, if you want more information, here's the source.