Stegotretus agyrus (Berman, Eberth and Brinkman 1988; Latest Carboniferous) was a more primitive lepospondyl sister to Pantylus, both derived from Scincosaurus. It probably also had short limbs and a long torso. The teeth were low and blunt. The skull was wide and ovate in cross-section. The jugal forms a descending cheek. The ectopterygoid and palatine are fused. Here the tabular is identified as the supratemporal (st).

Pantylus cordatus (Cope 1882) Early Permian, 25 cm in length was a basal microsaur. Derived from a sister to Scincosaurus, Pantylus was a sister to Stegotretus.

Distinct from Scincosaurus, the skull of Pantylus was larger relative to the body. A canine was present. Large blunt teeth appeared at the anterior dentary. A plate of several dozen teeth appeared on the mandible, unlike any other microsaur. The cervical ribs were longer and more robust to support the large skull. 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.

Below: An alternate pes reconstruction is offered based on sister taxa like Scincosaurus, and to match the metacarpals. The intermedium is reidentified.

Berman DS, Eberth DA and Brinkman DB 1988. Stegotretus agyrus, a new genus and species of microsaur (amphibian) from the Permo-Pennsylvanian of New Mexico. Annals of Carnegie Museum. 57: 293–323.

Cope ED 1882. Third contribution to the history of the Vertebrata of the Permian formation of Texas. Proceedings of the American Philosophical Society 20:447-461.

wiki/Pantylus
wiki/Stegotretus