Summations Only

btw, your spinosaurus reconstruction is wrong. some of the missing portions (like the legs) were reconstructed from closely related dinosaurs. apparently, it should look a bit more like this: crazy, right? well, they didn't. there's no clear clade we can associate with "reptile" except maybe sauropsids, and the ancestors of mammals actually diverge lower than sauropsids. mammals evolved from synapsids, which aren't exactly reptiles. they're kind of reptile-like amniotes.some people use "reptile" as a kind of evolutionary grade, because the things we call "reptiles" are a paraphyletic grouping, including a bunch of things but not their common ancestor, and excluding certain crown groups like mammals and birds.Edited by arachnophilia, : No reason given.