Original taxon: Bulla orbignyana.
The shell is devoid of any spiral sculpture, and only bears some longitudinal growth marks; the aperture is broad anteriorly, narrow posteriorly; labial margin « slightly larger than the spire, which is involute » (Malaquias & Cervera, 2006). « Columella covered by thin callus ».
Sant’Antioco island, Carbonia-Iglesias, SW. Sardinia. 10mm.
Notice the dark colour of the parapodial lobes. Specimen laying eggs on sea lettuce at the Pialassa Baiona, an eutrophic coastal lagoon connected to the Adriatic Sea through the channel-port of Ravenna, Italy. Original picture provided by M. Ponti for iNaturalist.org – (CC BY-NC).