Pusillina marginata (Michaud, 1830)
Mediterranean. Grazer and detritus feeder in the shallow infralittoral, often in lagunar environments.
Original taxon: Rissoa marginata.
Synonyms: puella, salinae.
Close to Pusillina inconspicua but with a less pointy apex.
5m deep, in grit, Salamina island, Attikí, E. Greece. 3,24mm.
As many Rissoids, the species is highly variable: « …the species shows considerable variation, comprising specimens with distinctly convex whorls, or a somewhat inflated body-whorl, […] obsolete and at the same time more numerous ribs, […] completely absent ribs, absent labial rib, absent spiral sculpture between the ribs, a more or less dark reddish-brown colour, or with numerous long, dark brown, longitudinal bands which are about as broad as their interstices… » – A. Verduin: “On the systematics of recent Rissoa of the subgenus Turboella Gray, 1847, from the Mediterranean and European Atlantic coast”, Basteria vol.40, 1976, p.50. – Same spot. 3mm.
3m deep, in grit, at the foot of the citadel, south of the harbour, Methóni, Messinia, Peloponnese, SW. Greece. 2,8mm.
Beach drift, Elafonisi area, SW. of Kissamos, W. Crete. 1,9mm.
52m deep, Ljubačka Vrata channel, southern end of Pag island, Zadar Comitat, W. Croatia. 2,4mm.
Young specimen with more numerous radials, from the same spot. 1,6mm. Notice, on these two shells from Pag channel, the faint spiral ribs on the abapical half of the most recent whorls. This feature is shared with some P. inconspicua.

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