Ianthasaurus
Ianthasaurus is an extinct genus of small edaphosaurids from the Late Carboniferous. Description. It is one of the smallest pelycosaurs known, with an 8 cm skull and a total body length of 75 cm. "Ianthasaurus" lacks many of the spectacular specializations seen in "Edaphosaurus". For example, the marginal dentition of "Ianthasaurus" is similar to that of insectivorous reptiles, with slender conical teeth which are slightly recurved at the tips, and there is a slight development of a caniniform region. The palatal and mandibular dentition is unspecialized, and there are no batteries of teeth for crushing of plant materials. Also  unlike "Edaphosaurus", "Ianthasaurus" was lightly built and was probably quite agile. The skull was similar to that of "Haptodus", a sphenacodontid, though they were distantly related. Discovery. It was named by Robert R. Reisz and David Berman in 1986. It was discovered by them in the Upper Pennsylvanian Rock Lake Shale near Garnett, Kansas.