Taxonomic notes on the Alvania dictyophora-complex with the description of Alvania desabatae spec. nov. (Gastropoda, Rissoidae) from the Mediterranean Sea

A new Mediterranean species of the genus Alvania (Rissoidae, Rissooidea) is here described: Alvania desabatae spec. nov. All known specimens come from the Ventotene Island (type locality), and from the Ponza and Zannone Islands in the Central Tyrrhenian Sea. The new species is compared with the most similar congeners: Alvania dictyophora (Philippi, 1844), Alvania clathrella L. Seguenza, 1903 ex Monterosato ms., Alvania bicingulata (G. Seguenza, 1876) and Alvania tenuicostata (G. Seguenza, 1876). A lectotype of Rissoa tenuicostata G. Seguenza, 1876 is hereby designated to stabilize its use.