They are the most abundant fishes today. These fleshy appendages provide sensory information for the caterpillar. They are often mistaken for antennae. The Tertiary period lasted from 65 to 1.8 million years ago. Many mammals developed then, including primitive whales, rodents, pigs, cat, rhinos, etc.
Therapsids are a clade of advanced synapsid animals from the late Permian period.
They had teeth that were differentiated into post-canines and incisors. Dominant among the early therapsids were the large dinocephalians. The clade of therapsids includes the mammals, some close relatives, and their recent common ancestors. Fossils have been found in the Karroo desert in Africa. Each of these legs has a grasping hook at the end.