Tomura depressa (Granata-Grillo, 1877)
Mediterranean to NW. Morocco (Rabat). Infralittoral.
Original taxon: Oxystele depressa. Synonym: tinostomoides.
8-12m deep, in sediments on sandy bottom, Vignola bay, Marina di Davia, Corbara, NW. Corsica. 1,2mm.
Original pictures provided by S. Clanzig (FR) – (CC BY-NC-SA).
« The shell […] is very small, Natica-like, with an umbilical callus, transparent and rather solid. The larval shell […] is hyperstrophic […]. Protoconch I is only partly visible, and is mainly sculptured by a system of branching and anastomosing small ridges, except close to the demarcation to protoconch II. Protoconch II is almost smooth with only a few incremental lines and spirally arranged granulae, and consists of about 0.7 whorl. The teleoconch consists of about 2.0 whorls, usually almost perfectly smooth, separated by a very indistinct and shallow suture. Occasional specimens differ in having the initial part of the teleoconch equipped with a few spiral ridges […], but this character varies in strength. The aperture is prosocline, almost tangential with the inner lip spread out to form a solid parietal and umbilical callus. […] Operculum […] thin and transparent, multispiral with short growth zone and central nucleus.  » – Warén, Gofas & Schander: “Systematic position of three European heterobranch gastropods”, The veliger vol. 36, Berkeley 1993, p.3.

Tharsiella tinostomoides Fekih & Gougerot, specimen MNHN-IM-2000-31687 in the collection of the Muséum national d’Histoire naturelle, Paris, France. Original pictures provided by M. Caballer for the MNHN (CC BY).
Presence of some growth-lines in subsutural position.
Original picture provided by S. Clanzig (FR) – (CC BY-NC-SA).
Other specimen with some spiral ridges near the apex.
7m deep, in shellgrit from cave, La Azohia, west of Cartagena, Murcia, S. Spain. 1mm. The shell is almost completely smooth, with only some weak traces of radial microsculpture.
Same spot. A specimen with better marked growth marks. 1mm.
45m deep, in muddy sands, Saronic Gulf, SE. Greece. 1,37mm.

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