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Re: the start
> Was dimetrodon a thecodont?
No, it was a Pelycosaur, which is a group of very early mammal-like
reptiles. That it, it is more closely related to our own lineage
than to either dinosaurs or to modern lizards.
> What separates thecodonts from Archosaurs,
> besides hip structure?
Nothing, thecodonts are a *sub*group of Archosaurs.
Archosaurs include thecodonts and most or all of their descendents
(depending on if you are a cladist or not). That is crocodiles,
pterosaurs, dinosaurs, and, to a cladist, birds are Archosaurs
Some also include a few other distantly related groups in
> Have thecodonts sometimes been called
> "mammal-like reptiles"?
Nope, that is a seperate lineage - the one leading to true mammals.
They are so called because the later members of the group, the
Therapsids, are very much like mammals in many respects.
> If so, why? I know "dont" refers to teeth,
> what does "theco" refer to?
Groove. It refers to the way the teeth are socketed in the jaw,
embedded in a groove.
The peace of God be with you.