Heteromysis arianii sp.n., a new benthic mysid (Crustacea, Mysidacea) from coralloid habitats in the Gulf of Naples (Mediterranean Sea)

Using a diver-operated suction pipe, Heteromysis (Heteromysis) arianii sp.n. was sampled from coralloid habitats in the biological protection zone Banco di Santa Croce (southern Gulf of Naples). Among known European species of Heteromysis, the new species is especially remarkable by a strong sexual dimorphism of the third thoracic endopod. Only the males show a peculiar subcuticular ornamentation in the precervical region of the carapace. A key to the six species of Heteromysis known from the Mediterranean Sea is given.