The content of the registry is edited and maintained by scientific specialists on each group of organism. These taxonomists control the quality of the information, which is gathered from malacological journals and several regional and taxon-specific databases. WoRMS maintains valid names of all marine organisms, but also provides information on synonyms and invalid names. It will be an ongoing task to maintain the registry, as new species are constantly being discovered and described by scientists. In addition, the nomenclature and taxonomy of existing species is often corrected or changed as new research is constantly being published.
As of February 2018, WoRMS contained listings for 480,931 marine species names (including synonyms) of which 240,633 are valid marine species (95 % checked). Their goal is to have a listing for each of the approximately more than 240,000 marine species.
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