Did Synapsids Have Fur?

While more direct evidence of fur in early cynodonts has been proposed in the form of small pits on the snout possibly associated with whiskers, such pits are also found in some reptiles that lack whiskers. ... However, Permian coprolites from Russia showcase that at least some synapsids did already have fur in this epoch.

Did therapsids have fur?

Fur and endothermy

Therefore, like modern mammals, non-mammalian therapsids were most likely warm-blooded. Recent studies on Permian coprolites showcase that hair was present in at least some therapsids.

What did synapsids look like?

Archaeothyris looked vaguely like a lizard, but many anatomical features such as the single skull opening behind the eye prove it to be an early synapsid. Our synapsid forbearers first came to real prominence during the Permian period, a time that began almost 300 million years ago, long before the first dinosaurs.