Nematopsis spp. Schneider, 1892 (Apicomplexa: Gregarinida) in bivalve molluscs off Ria de Vigo (Galicia, NW Spain).
A study of protozoan parasites within the genus Nematopsis was carried out in different species of commercially-exploited bivalve molluscs in Ria de Vigo, northwest Spain. Prevalence was frequently high (>60%), ranging from 14.28% in Tapes decussatus and 25% in T. philippinarum to 100% in Gari depressa, Mytilus galloprovincialis, Solen vagina and T. rhomboideus. Parasites were found in the connective tissue of all organs examined, with the highest levels of infection located in the gills.