Erpetonyx arsenaultorum by lythronax argestes-d8ef9oe
An artist;s illustration of Erpetonyx arsenaultorum
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Procolophonomorpha
Genus: Erpetonyx
Modesto et al., 2015
Type species
Erpetonyx arsenaultorum
Modesto et al., 2015

Erpetonyx was a genus of early parareptile, specifically a bolosaur, described in 2015. It lived in Gzhelian stage of the Carboniferous period. It is one of the few fossil taxa known from the Canadian province of Prince Edward Island. It is known from a single small, complete, and articulated specimen. It is the oldest currently known parareptile, and has brought back ghost lineages for several groups within the clade.