Full reference: F. B. Nopcsa. 1923. Eidolosaurus und Pachyophis, Zwei neue Neocom-Reptilien. Palaeontographica 65:97-154
Parent taxon: Serpentes according to J. J. Head 2020
See also Albino 2000, Augé and Rage 2006, Fernicola and Albino 2012, Gardner and Cifelli 1999, Holman and Case 1988, Ikeda et al. 2016, Longrich et al. 2012, Nessov et al. 1998, Palci et al. 2013, Parmley and DeVore 2005, Rage 1984, Smith 2013, Snetkov and Bannikov 2010, Stocker and Kirk 2016, Venczel and Stiuca 2008, Vidal and Hedges 2002, Wilcox et al. 2002, Wilson et al. 2010 and Zvonok and Snetkov 2012
Sister taxa: Botrophis, Cheilophis, Cholophidia, Coluber steinheimensis, Colubridae, Coniophis, Coniophis cosgriffi, Coniophis dabiebus, Coniophis precedens, Diablophis, Dinilysia, Dinilysiidae, Dipsadidae, Eophis, Goinophis, Hoffstetterella, Hoffstetterella brasiliensis, Hoplocephalus, Lunaophis, Madtsoiidae, Natricidae, Ophidion, Ophidioniscus, Ophidium, Ophidium, Palaeophiidae, Portugalophis, Pseudonaja, Pythonoidea, Scolecophidia, Tomodon, Xiaophis
Subtaxa: Acrochordoidea Afrotortrix Aniliidae Anilioidea Caenophidia Cerberophis Colombophis Colubroidea Cylindrophiidae Henophidia Itaboraiophis Macrostomata Paulacoutophis Pseudoxyrhophiidae Simoliopheoidea Tuscahomaophis