Pantylus cordatus (Cope 1882) Early Permian, 25 cm in length was a basal microsaur. Derived from a sister toMicrobrachis, Pantylus phylogenetically preceded Tuditanus and Anthracodromeus
Distinct from Microbrachis, the skull of Pantylus did not fuse the jugal and postorbital and no trace of the supratemporal/tabular shelf was apparent. The skull bulged at the sides giving the occiput an oval appearance. The jugal descended, overhanging the mandible in lateral view. The teeth were fewer in number and blunt. A canine was present. The jaw joint was lower than the tooth row. Large blunt teeth appeared at the anterior dentary. A plate of several dozen teeth appeared on the mandible, unlike any other microsaur.
Distinct from Doleserpeton, the cervical ribs were longer and more robust. The the dorsal ribs were longer and curved around the torso. The tail was shorter.
The shoulder girdle was moved back, creating a longer neck. The cleithrum was smaller. The interclavicle was T-shaped.
The ilium was narrower dorsally. The ventral pelvis was more robust.