Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key Author Rasmussen, Arne Redsted Author Elmberg, Johan Author Gravlund, Peter Author Ineich, Ivan text Zootaxa 2011 2894 1 20 journal article 46820 10.5281/zenodo.277666 479010ae-6e99-4cc9-b4d3-b39ccc814f9a 1175-5326 277666 Thalassophis Schmidt Thalassophis anomalus Schmidt : ( Kharin, 1984b , 2006 ). Diagnostic characters: A pair of elongated shields separate the nasals, rostral divided into four or five scales. Head shields with thickened edges. Scale rows around neck 27–30; scale rows around body 31–35; ventrals 210– 256. Maxillary teeth behind fangs 5. Colouration: Greyish above. Whitish below with dark bands, which taper to a point laterally or continue as narrow bands ventrally to encircle the body. Size: 81 cm . General distribution: Singapore , Gulf of Thailand , Vietnam , East Sumatra, Borneo and Moluccas ( David & Ineich, 1999 ).