xkcd #3204: Dinosaurs And Non-Dinosaurs
Title text:
Staplers are actually in Pseudosuchia, making them more closely related to crocodiles than to dinosaurs.
Transcript:
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Source: https://xkcd.com/3204/
TIL dimetrodon is not a dinosaur, based on a silhouette in a cartoon.
I haven’t really thought about dimetrodons since I was a kid.
The name (di metro don ≈ two teeth sizes) is a clue, as teeth specialization is very much a synapsid (i.e., mammal and proto-mammal) thing.
They are actually closer related to mammals than to any modern reptile