from the GNU version of the Collaborative International Dictionary of English
- n. A large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America
Sorry, no etymologies found.
Fossil fish in Romer Hall (with a specimen of the pelycosaur Edaphosaurus on the right).
I was under the impression that “therapsid” always referred to a kind of synapsid reptile and was distinct from “pelycosaur” another kind of synapsid think dimetrodon.
I had no sooner spoken than I remembered the pelycosaur we had seen in the jungle.
The last "pelycosaur": a varanopid synapsid from the Pristerognathus Assemblage Zone, Middle Permian of South Africa Naturwissenschaften, 98 12, 1027-1034 DOI:
2. Which of these were not dinosaurs: the pelycosaur Dimetrodon, the winged pterosaurs, and the aquatic ichthyosaurs, plesiosaurs and mosasaurs.
From my readings on The Ancestor’s Tale and elsewhere, it looks like the primate/mammal split occurred 70 million years ago, which is before the dinosaurs died out 65 million years ago, and the split between the dinos and the lines that would become mammals and marsupials Dimetrodon, though it looked like a dinosaur, was a pelycosaur on our branch, not theirs occurred before dinosaurs actually walked the earth.