Erpetonyx is an extinct genus of bolosaurian parareptile from the Gzhelian stage of the Carboniferous period, with a single known species: Erpetonyx arsenaultorum...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

Procolophonomorpha+Neodiapsida. The oldest known parareptiles are the bolosaur Erpetonyx and the acleistorhinid Carbonodraco from the Late Carboniferous (Moscovian-Gzhelian)...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...

†Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey...