Cricotus

Cricotus is an extinct genus of Embolomeri.

It was erected by Cope in 1875,[1] on the basis of fragmentary, not clearly associated remains including caudal vertebrae, on which the name was established (in fact, based on a single intercentrum), as well as a few other postcranial bones.

It was little-used in the subsequent literature, contrary to Archeria, which appears to be a junior synonym of Cricotus.

This led to Holmes[2] suggesting using the name Archeria for this taxon, though he provided no evidence that he made a formal appeal to the International Commission on Zoological Nomenclature for this (and presumably did not do so).

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A skeleton of Cricotus crassidens (specimen AMNH 4550)
Detail of the skull and limbs of AMNH 4550
Illustration of the skull and ventral scutes of Cricotus heteroclitus by Edward Drinker Cope .