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Re: Are dinosaurs really reptiles?



That would indeed be an excellent name for the sauropsid crown group!

Perhaps it should be reserved for something apomorphy-based, though, because many early amniotes are preserved in materials that might occasionally preserve skin impressions (and regularly preserve the relief of ossified dermal, as opposed to epidermal, scales). It's not like the amnion, where the probability of fossilization is completely negligible. Scales of Cretaceous squamates are regularly preserved in KonservatlagerstÃtten, and there's a Middle Triassic *Macrocnemus* with scales; the JVP of December has a paper on a *Leptorophus* specimen (called *Melanerpeton*, which nobody else seems to do; may or may not make sense) that preserves the pigment pattern of the skin -- and that's around the Carboniferous-Permian boundary.


And then, how old exactly are mammalian tail scales? Monotremes lack them, but is that just because there are no mouse-sized monotremes with long tails (anymore)?