Original taxon: Fossarus petitianus. Above and below:
35m deep, Isola dei Porri, Ispica, Ragusa, SE. Sicilia. 2,67mm. Original pictures provided by A. Nappo (IT).
– (CC BY-NC-SA) –
The shell differs from those of azoneus and yoidanyi by its elevated spire, a smaller and shallower umbilicus, and by the weaker and more numerous axials. It is also much smalller than adults of azoneus.