Article: A reappraisal of the early Permian amphibians Memonomenos dyscriton and Cricotillus brachydens
Andrew R. Milner
Memonomenos dyscriton Steen from the Autunian of Kost'alov in Czechoslovakia is a temnospondyl amphibian of the family Archegosauridae, and not an anthracosaur as previously believed. Because of its close similarity to Archegosaurus decheni it is transferred to the same genus as a distinct species, A. dyscriton comb. nov. It appears to have been an inhabitant of a large stratified perennial lake in the Krkonose-piedmont basin. Other material referred to the genus 'Memonomenos' is not generically or specifically determinate. Another supposed anthracosaur, Cricotillus brachydens Case, from the Permian of Orlando, Oklahoma, is reidentified as large uro-cordylid nectridean material subjectively synonymous with Crossotelos annulatus Case. The North American genus Archeria represents the only lineage of anthracosaur (sens. Panchen) to survive into the Permian.