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Nemys is an online species information system. It acts as a digital platform, storing all kinds of information on biological taxa of free-living marine, brackish, fresh-water and terrestrial nematodes. Storing data on morphology, biogeography, taxonomy, literature, pictures, collections and molecular aspects in one single dataset creates a large group of possible end users and allows data analysis and comparison for a specific taxonomic group from a variety of approaches.

The entire global species information system was developed at the Marine Biology Research Group, primarily focusing on marine free-living Nematoda.

Nemys data is collected and managed by an international team of taxonomic editors and shared with a number of global and regional biodiversity information portals (eg. the European Register of Marine Species, OBIS and GBIF). The Nemys website is integrated into the World Register of Marine Species (WoRMS) hosted at the Flanders Marine Institute (VLIZ).