BASTERIA, 70: 29-31, 2006 Indo-Pacific migrants into the Mediterranean.3. Atys angustatus Smith, 1872 (Gastropoda, Opisthobranchia) J.J. van Aartsen & J. Goud National Museum of Natural HistoryNaturalis, P.O. Box 9517, NL 2300 RALeiden, The Netherlands;
[email protected] /
[email protected] The Red Sea of the revised in order unravel the iden- species opisthobranch genus Atys are to in in tity of anAtys species that has settled the Mediterranean. The species questionturned out tobe Atys angustatus. Key words: Gastropoda,Opisthobranchia, Haminoeidae, Atys, taxonomy, Red Sea, Mediterra- nean, migrant species. Figs 1-3. Atys spec. 1, Atys angustatus Smith, 1872, lectotype BMNH 196972, Suez; 2, Atys angustatus Smith, 1872, specimen from Haifa Bay, Israel; 3, Atys cylindricus (Helbling, 1779), juvenile from Azaiba, Gulf ofOman. All on the same scale. ') No. 2: Basteria 70: 1-6, 2006. 30 BASTERIA, Vol. 70, No. 1-3, 2006 Among several Indo-Pacific molluscan species found in the Mediterranean, but not yet recorded as such, is a small opisthobranch of the genusAtys Montfort, 1810. Although A already known for thirty years, its identificationproved difficult. critical revision of the of from the Red is known species Atys Sea necessary. Issel (1869: 168) mentions: Atys solida Bruguiere, 1792, usually considered a form of Atys cylindricus (Helbling, 1779) after Pilsbry (1895: 265);Alicula cylindrica ”L.”, probably referring to the species of that name first describedby Helbling (1779: 122); Alicula bacil- lus Ehrenberg, 1831, considered to be a Cylichna by Pilsbry (1895: 311); Alicula succisa after and described Ehrenberg, 1831, a young A. cylindricus, Pilsbry (1895: 268); as new (1869: 281) Alicula ehrenbergi Issel, 1869.