The sail may be an analog of the sail of the Permian synapsid " Dimetrodon ", which lived before the dinosaurs even appeared, produced by convergent evolution.
42.
He later decided that " Naosaurus " must have had a large carnivorous skull similar to " Dimetrodon ", although he had no direct fossil proof.
43.
The episode ends with the wounded mother joining other adult " Dimetrodon " in attacking her own young which race to the trees and hide in dung to escape.
44.
This structure was possibly for thermal regulation, as in other animals of similar appearance, such as the pelycosaurs " Dimetrodon " and " Edaphosaurus ".
45.
Single openings in the skull behind each eye, known as temporal fenestras, and other skull features distinguish " Dimetrodon " and mammals from most of the earliest sauropsids.
46.
Artist Rudolph Zallinger depicted " Edaphosaurus " alongside " Dimetrodon " and " Sphenacodon " to represent the Life " magazine in 1952 to 1954.
47.
Also, a Dimetrodon is depicted as dwarfing St . Basil's Cathedral, several herbivores as flesh-eaters, and other various dinosaurs as being almost Kaiju-like.
48.
These specimens come from the basal group of therapsids, " Lycaenodon " shares many features with earlier and less mammal-like synapsids like " Dimetrodon ".
49.
A pregnant female " Dimetrodon ", another pelycosaur, hunts the " Edaphosaurus " herd, beginning with a fake charge to expose the weak and the juveniles.
50.
In " Dimetrodon ", the neural spines develop into long, narrow, cylindrical projections that support a tall vertical dorsal sail that ends near the base of the tail.
