WoRMS - World Register of Marine Species
Search WoRMS. News. Who is using WoRMS?. Citation. Disclaimer. Statistics. About WoRMS. Citations (Google scholar). [ Advanced search ] Statistics 214,341 accepted species; of which 196,842 checked (92%) 367,504 species names including synonyms 459,641 taxa (infraspecies to kingdoms) 26,839 image...
marinespecies.org alternate of register.php, isn't it?