After Caldwell & Lee, 1997, Zaher, 1998, Scanlon, & Lee, 2000 and Zaher & Rieppel, 2002

Alternative phylogeny of basal snakes after Zaher, 1998, Tchernov, Rieppel, Zaher, Polcyn, & Jacobs, 2000, Zaher & Rieppel, 2002 and Rieppel, Kluge & Zaher, 2002

<==o Serpentes Linnaeus, 1758 [Ophidia sensu Lee & Caldwell, 2000] (snakes; käärmeet)
   |?- †Najash rionegrina Apesteguía & Zaher, 2006
   |?-o †Pachyophiidae sensu Caldwell & Lee, 1997 [Pachyrhachidae]
   |  |-- †Pachyophis woodwardi Nopsca, 1923
   |  |-- †Eupodophis descouensi (Rage & Escuiillié, 2000) Rage & Escuillié, 2002 [Podophis descouensi Rage & Escuiillié, 2000]
   |  |-- †Pachyrhachis problematicus Haas, 1979?, 1980? [Ophiomorphus colberti, Estesius colberti]
   |  `-- †Haasiophis terrasanctus (Tchernov, Rieppel, Zaher, Polcyn & Jacobs, 2000) Polcyn, Tchernov & Jacobs, 2003 [Haasia Polcyn, Tchernov & Jacobs, 1999; non Haasia Bollman, 1893 (Myriapoda) nor Haasia Yuan, 1988 (Trilobita)]
   `--o Serpentes Linnaeus, 1758 sensu Lee & Caldwell, 2000
      |?-o †Coniophis
      |  |-- †C. cosgriffi
      |  |-- †C. precedens
      |  |-- †C. carinatus
      |  |-- †C. platycarinatus
      |  `-- †C. dabeidus
      |?- †Palaeophidae Lydekker, 1888
      |?- †Madtsoiidae Hoffstetter, 1961 sensu Scanlon & Lee, 2000
      `--+?-o Scolecophidia Duméril & Bibron, 1844 (sokkokäärmeet)
         |  |-- Leptotyphlopidae (matokäärmeet) [2/93]
         |  `--+-- Typhlopidae (sokkokäärmeet)
         |     `-- Anomalepididae
         `--+?- †Dinilysia patagonica Smith-Woodward, 1901 sensu Zaher, 1998 [Dinilysiidae McDowell, 1987]
            `--o Alethinophidia Nopcsa, 1923
               |--o Lapparentophidae
               |  |?- †Lapparentopheidae genera et species indet. 1 [Sudan]
               |  |?- †Lapparentopheidae genera et species indet. 2 [Sudan]
               |  |?- †Pouitella pervetus
               |  `-- †Lapparentophis defrennei 
               `--+-- †Simoliophis sauvagei [Simoliophidae]
                  |-- Anilioidea (telakäärmeensukuiset)
                  `-- Macrostomata
          

Serpentes incertae sedis:

Many of these are probably madtsoniids or booids.

OphidiumMesophisAlbaneryxCadurceryxCadurcoboaDaunoplisDawsonophisDunnophisHelagras prisciformisLithopbisPaleopythonPaleryxPlesiotortrixPterygoboaTregophis

Reference(s):