WoRMS- World Register of Marine Species

A species list of marine organisms, with current taxonomic information, including any synonomies that might exist. Can search by geographic region.

Dataset available here: http://www.marinespecies.org/index.php

Available with CC-BY license, cite individual pages as listed on those pages.

Suggested citation for entire database:

Boxshall, G.; Mees, J.; Costello, M. J.; Hernandez, F.; Vandepitte, L.; Gofas, S.; Hoeksema, B. W.; Klautau, M.; Kroh, A.; Poore, G. C. B.; Read, G.; Stöhr, S.; de Voogd, N. J.; Walter, C. T.; De Broyer, C.; Horton, T. & Kennedy, M. (eds) (2013). World Register of Marine Species. Accessed at http://www.marinespecies.org on year-month-day