PaleoDB taxon number: 346431
Full reference: J. A. Holman. 1993. A new genus of primitive colubroid snake from the upper Eocene, Isle of Wight, England. Tertiary Research 14(4):151-154
Sister taxa: none
Type specimen: MSUVP 1342 (single trunk vertebra). Its type locality is Headon Hill HH2, Lower Headon Beds, Isle of Wight, which is in an Eocene marine claystone/claystone in the Lower Headon Beds Formation of the United Kingdom.