Database details

Full name:

UNESCO-IOC Register of Marine Organisms

Short name:



Nov 2008

Release date:

November 18th, 2008


J van der Land (ed)

Taxonomic coverage:

Animalia Acoelomorpha(New!), Cephalorhyncha, Chaetognatha, Cnidaria (except order Actiniaria), Ctenophora, Echiura, Gastrotricha, Gnathostomulida, Hemichordata, Mesozoa, Placozoa, Sipuncula; Platyhelminthes Cestoda Amphilinidea (New!) & Gyrocotylidea (New!), Trematoda Aspidogastrea (New!); Annelida Pogonophora; Arthropoda Merostomata & Pycnogonida; Mollusca Monoplacophora (New!), Polyplacophora (New!), Scaphopoda (New!); Chordata Appendicularia, Ascidiacea, Cephalochordata & Thaliacea

Number of species names:

16,905 accepted names; 1,917 synonyms

Number of infraspecies names:

36 accepted names; 3 synonyms

Number of common names:


Total number of names:



The UNESCO-IOC Register of Marine Organisms (URMO) is an already large and gradually growing dataset that is being edited by Jacob van der Land at the National Museum of Natural History, Leiden and many co-authors. URMO is hosted by the Flanders Marine Institute (VLIZ) as a contribution to IODE. The Register contains a number of global species databases for exclusively marine invertebrates and 25 of these are included in this Annual Checklist in 12 phyla and 10 classes.


National Museum of Natural History (Naturalis), Leiden, The Netherlands

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