Dimetrodons don't count.
July 22, 2014 6:52 AM Subscribe
How many kinds of dinosaurs were alive at the same time?
I understand that there are fewer than 1,000 distinct kinds or species of dinosaurs (maybe many fewer), but that dinosaurs lived on earth for about 150 million years. This would mean that even if a single species lived for 10 million years, there could be no more than 50 or so species alive at any one time. Yet I had assumed that dinosaurs were a bit like mammals in the sense that hundreds or thousands of distinct kinds lived all at once.
So if you went back to the time when dinosaurs lived, how many species would be alive on any given day?
(I'm not asking how many individuals could have been alive at one time, as that is a different ask altogether.)