Reptilia Linnaeus 1758 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Class Reptilia Linnaeus, 1758
   †Parareptilia Olson 1947 [deBraga & Reisz 1996] see Subclass Parareptilia Olson, 1947
     †Procolophonomorpha Romer, 1964 see Order Procolophonomorpha Romer, 1964
       †Bolosauria Kuhn 1959 [Modesto, Scott, MacDougall, Sues, Evans & Reisz 2015]
         Genus †Erpetonyx Modesto, Scott, MacDougall, Sues, Evans & Reisz, 2015 [monotypic]
           1 †Erpetonyx arsenaultorum Modesto, Scott, MacDougall, Sues, Evans & Reisz, 2015