Status of the Asiatic sea snakes of the Hydrophis nigrocinctus group (H. nigrocinctus, H. hendersoni, and H. walli; Elapidae, Hydrophiinae)

The literature of the Hydrophis nigrocinctus group, including Hydrophis nigrocinctus, H. hendersoni and H. walli, is reviewed. Based on internal and external morphological data from the literature and own examination of museum specimens, we recognize two valid species in the complex: Hydrophis nigrocinctus and H. hendersoni. Hydrophis walli is synonymised with H. nigrocinctus.