<<Were there any mammal groups that were around in the Early Triassic that were not around in the Late Triassic?>>
As the earliest mammals by any current definition are all Upper Triassic, Rodlox, the answer is no.
I see. Thank you (to everyone who replied)
What about the mammal-like-reptiles ? *curious*
<< Are there any websites that show pictures/images of Triassic mammals? (ideally with representatives of all the groups that were around back then)>>
same question, with the mammal-like-reptiles.
again, thank you.