Intertidal biodiversity hotspot strikes again: first record of Caliphylla mediterranea A. Costa, 1867 (Mollusca, Sacoglossa) in the Adriatic Sea, Italy

The Mediterranean Sea is considered a hotspot of molluscan diversity even if many marine environments are still poorly explored and could mask rare and/or neglected diversity. During a night survey in a rocky tide pool in the Adriatic Sea, near Ancona, Italy, Caliphylla mediterranea A. Costa, 1867, a rare sacog‑ lossan mollusc, was observed and documented. This finding constitutes the first record of this species for the Adriatic Sea and one of the few for the whole Mediterranean basin extending the known distributional range of this poorly known species.