Alvania garrafensis Peñas & Rolán 2008 (Gastropoda: Rissoidae) from Croatian waters

We report on the presence of numerous specimens of Alvania garrafensis Peñas & Rolán 2008 from shell grit dived in shallow waters near several islands of the Quarnero Gulf, North Adriatic Sea, Croatia. The species was up to now known only from the Garraf littoral, Barcelona, East Spain and the present records greatly extend its geographical distribution. Hypotheses that could explain such a large range extension are considered