| The therapsids of this time belonged to several distinct lineages, none with clear antecedents. |
| The Russian and South African sites contain the remains of many therapsids. |
| However, he was the first to spot the connection between the early therapsids and the mammals. |
| These basal forms evolved through the primitive pelycosaur stage, to the therapsids or mammal-like reptiles, and finally the mammals themselves. |
| This gap is all the more extreme because pelycosaurs and therapsids are each large, internally-diverse groups. |
| On land amphibians and therapsids were both badly affected, while vascular plant diversity dropped by 50 per cent. |
