Redondasaurus at the Carnegie Museum, by the author
As I settle into university life for the first time, I take it upon myself in my free time to become better acquainted with the base of the archosaur tree. If you haven’t noticed the blog’s tag by now, it calls out Archosauria (Cope, 1869) by name, establishing the crown-archosaurs as its focus, and although I make obvious digressions to post about other animals now and again (I am a flighty, easily-distracted individual), this is treated as, more or less, gospel. Unfortunately, this maxim implicitly excludes the more basal archosauriforms and archosauromorphs, who reside along the stem of this tree, and which may well have a fair claim to “archosaurishness” themselves.
But I find myself worrying. This limitation omits a variety of fascinating critters from the Permian, the Triassic, and… otherwise. And on top of this, the boundaries of the “true” archosaurs occasionally blur and shift subtly. Case in point…
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