Rissoa parvaRissoa parva is a species of small sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae.TaxonomyThe status of R. interrupta in relation to R. parva is still a point of discussion. Based on research of Wigham, R. interrupta is considered by many authors as a variety of form of R. parva. Nordsieck and Verduin think however that R. interrupta and R. parva are two different species. Both species have a sympatric appearance.DistributionThis species occurs in European waters, the Mediterranean Sea and the Black Sea. Fossils have been found in Quaternary strata of Rhodos, Greece.