Cerithidium submammillatum
(de Rayneval & Ponzi, 1854)
Black Sea, Mediterranean and adjacent.
From shallow subtidal gardens to deep circalittoral. Grazer.
Original taxon: Cerithium submamillatum.
Synonym: Turitella pusilla.
Above and below: 150m deep, in grit, Qammieh Bay, Il-Mellieħa, NW. Malta. 2,5-3mm.
Other synonyms: pulchella Pallary.
Sculpture more or less prominent. Juvenile, found at 1,8m deep inside the sediment, bottom at 17m, Prokljan marine lake, Šibenik-Knin Comitat, W. Croatia. 0,8mm.
Subadult from ≈ 8m deep inside the sediment, bottom at 13m, mouth of Krka river, Prokljan marine lake. 2,4mm.
The species differs from the foreign Cerithidium diplax (Watson, 1886) by its more solid shell, its 4 rows of major spiral ridges on the penultimate whorl when diplax bears usually only 2, and by the broader interspaces on the last whorl.

La Franqui, Leucate, Occitania, S. France. 4mm. Original pictures provided by S. Clanzig (FR) – (CC BY-NC-SA).
Downslope transportation.
500m deep, Capo Teulada, Cagliari, S. Sardinia. 3,5mm.
variation of shape and sculpture. Same spot. 2,5-2,7mm.

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