On the occurrence of Atys angustatus E. A. Smith, 1872 and Atys macandrewii E. A. Smith, 1872 (Cephalaspidea: Haminoeidae) in the Mediterranen Sea

The occurrence of two cephalaspidean gastropods, Atys angustatus and A. macandrewii, in the Mediterranean Sea, is reviewed and their distribution updated. Recent findings confirm that both A. angustatus and A. macandrewii are present in the Eastern Mediterranean. The synonymy of A. angustatus with Rhizorus ovulinus (A. Adams, 1862) and Aliculastrum debilis (Pease, 1860) is discussed and considered erroneous.