Database details

Full name:

UNESCO-IOC Register of Marine Organisms

Short name:



Dec 2007

Release date:

December 18th, 2007


J van der Land (ed)

Taxonomic coverage:

Animalia – Cephalorhyncha, Chaetognatha, Cnidaria (except order Actiniaria), Ctenophora, Echiura, Gastrotricha, Gnathostomulida, Hemichordata, Mesozoa, Phoronida, Placozoa, Sipuncula; Annelida – Pogonophora; Arthropoda – Merostomata & Pycnogonida; Chordata - Appendicularia, Ascidiacea, Cephalochordata & Thaliacea

Number of species names:

14,919 accepted names; 1,760 synonyms

Number of infraspecies names:

36 accepted names; 0 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 20 of these are included in this Annual Checklist in 12 phyla and 7 classes.


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

Web site:

New search