Hydrophis

Hydrophis is a genus of sea snakes, venomous snakes in the subfamily Hydrophiinae of the family Elapidae. Species in the genus Hydrophis are typically found in Indo-Australian and Southeast Asian waters. Currently, around 36 species are recognized as being valid.

==Systematics and classification== There are more than 30 recognized species in the genus. {| class="wikitable sortable" !Species !Authority !Subsp.* !Common name !Geographic range |- |H. annandalei |(Laidlaw, 1901) |align="center"|0 |bighead sea snake, Annandale's sea snake |Indian Ocean |- |H. anomalus |P. Schmidt, 1852 |align="center"|0 |anomalous sea snake |South Chinese Sea, Indian Ocean |- |H. atriceps |Günther, 1864 |align="center"|0 |black-headed sea snake | |- |H. belcheri |(Gray, 1849) |align="center"|0 |Belcher's sea snake |Queensland and New Territories, Australia |- |H. bituberculatus |W. Peters, 1873 |align="center"|0 | Peters' sea snake | Indian Ocean (Sri Lanka, Thailand) |- |H. brookii |Günther, 1872 |align="center"|0 |Brooke's sea snake | |- |H. caerulescens |(Shaw, 1802) |align="center"|2 |dwarf sea snake |Queensland, Australia |- |H. cantoris |Günther, 1864 |align="center"|0 |Cantor's narrow-headed sea snake, Cantor's small-headed sea snake | |- |H. coggeri |(Kharin, 1984) |align="center"|0 |slender-necked sea snake, Cogger's sea snake |Western Australia |- |H. curtus |(Shaw, 1802) |align="center"|0 |Shaw's sea snake, short sea snake, Hardwicke's sea snake, spine-bellied sea snake | |- |H. cyanocinctus |Daudin, 1803 |align="center"|0 |annulated sea snake, blue-banded sea snake | |- |H. czeblukovi |(Kharin, 1984) |align="center"|0 |fine-spined sea snake | |- |H. donaldi |Ukuwela, Sanders & Fry, 2012 |align="center"| |rough-scaled sea snake |Northern Australia |- |H. elegans |(Gray, 1842) |align="center"|0 |elegant sea snake | |- |H. fasciatus |(Schneider, 1799) |align="center"|0 |striped sea snake | |- |H. hardwickii |(Gray, 1834) |align="center"|0 |Hardwicke's spine-bellied sea snake | |- |H. inornatus |(Gray, 1849) |align="center"|0 |plain sea snake |Western Australia |- |H. jerdonii |(Gray, 1849) |align="center"|2 |Jerdon's sea snake |Indian Ocean |- |H. kingii |Boulenger, 1896 |align="center"|0 |King's sea snake | |- |H. klossi |Boulenger, 1912 |align="center"|0 |Kloss' sea snake | |- |H. laboutei |Rasmussen & Ineich, 2000 |align="center"|0 |Laboute's sea snake |New Caledonia |- |H. lamberti |M.A. Smith, 1917 |align="center"|0 |Lambert's sea snake | |- |H. lapemoides |(Gray, 1849) |align="center"|0 |Persian Gulf sea snake | |- |H. macdowelli |Kharin, 1983 |align="center"|0 |small-headed sea snake, McDowell's sea snake |Western Australia |- |H. major |(Shaw, 1802) |align="center"|0 |greater sea snake, olive-headed sea snake | |- |H. mamillaris |(Daudin, 1803) |align="center"|0 |Bombay sea snake | |- |H. melanocephalus |Gray, 1849 |align="center"|0 |slender-necked sea snake | |- |H. melanosoma |Günther, 1864 |align="center"|0 |black-banded robust sea snake | |- |H. nigrocinctus |Daudin, 1803 |align="center"|0 |black-banded sea snake |Sunderbans,(Bangladesh, India) |- |H. obscurus |Daudin, 1803 |align="center"|0 |estuarine sea snake, Russel's sea snake | |- |H. ocellatus |(Gray, 1849) |align="center"|0 |spotted sea snake | |- |H. ornatus |(Gray, 1842) |align="center"|4 |ornate reef sea snake | |- |H. pacificus |Boulenger, 1896 |align="center"|0 |large-headed sea snake | |- |H. parviceps |M.A. Smith, 1935 |align="center"|0 |Smith's small-headed sea snake | |- |H. peronii |(A.M.C. Duméril, 1853) |align="center"|0 |Peron's sea snake | |- |H. platurus |Linnaeus, 1766 |align="center"|0 |yellow-bellied sea snake | |- |H. schistosus |Daudin, 1803 |align="center"|0 |beaked sea snake |Indian Ocean and Persian Gulf to Pacific Ocean |- |H. semperi |Garman, 1881 |align="center"|0 |Lake Taal snake, Garman's sea snake, Philippine freshwater sea snake, Luzon sea snake | |- |H. sibauensis |A. Rasmussen, Auliya & W. Böhme, 2001 |align="center"|0 |Kalimantan sea snake | |- |H. spiralis |(Shaw, 1802) |align="center"|0 |yellow sea snake | |- |H. stokesii |(Gray, 1846) |align="center"|0 |Stokes' sea snake, Stokes's sea snake | |- |H. stricticollis |Günther, 1864 |align="center"|0 |collared sea snake | |- |H. torquatus |Günther, 1864 |align="center"|2 |west coast black-headed sea snake | |- |H. viperinus |P. Schmidt, 1852 |align="center"|0 |viperine sea snake |Persian Gulf and Western Indian Ocean to Western Pacific Ocean |- |H. vorisi |Kharin, 1984 |align="center"|0 |estuarine sea snake |Torres Strait, Queensland |- |H. zweifeli |(Kharin, 1985) |align="center"|0 |Sepik beaked sea snake, Zweifel's beaked sea snake | |- |} ) Not including the nominate subspecies (typical form).