Rissoa monodonta Philippi, 1836
Alborán, W. Mediterranean, Adriatic.
Possibly also in NE. Mediterranean.
Grazer and detritus feeder, in the infralittoral and the circalittoral, peculiarly around Cymodocea nodosa meadows.
25m deep, on sand, Cittadella del Capo, Cosenza, Calabria, SW. Italy. 5,6mm. Original pictures provided by A. Nappo (IT).
– (CC BY-NC-SA) –
« Testa oblongo-conoidea, acuta, laevissima, pellucida, hyalina, anfractibus planulatis; labro intus marginato; columella basi unidentata. » – R. A. Philippi: Enumeratio molluscorum Siciliae vol. I, Berlin 1836, p.155.

100-150m deep, Motril, Granada, Andalucia, S. Spain. 5mm.
The species is close to auriformis Pallary but is slightly taller, with a more pointed apex, and a less expanded labial margin.
 
Specimen from the early Holocene, found at 1m deep inside the sediment, 65m deep, Kornati channel, Šibenik-Knin Comitat, W. Croatia. 5,5mm.
Phillippi: « Saepe specimina recentia lineis pallidis rufo corneis in ziczac flexis ornata sunt. » – Genoveses, Almería, Andalucia, among Cymodocea seagrass. 6,3mm. Original pictures provided by S. Gofas for WoRMS – (CC BY-NC-SA).
15-20m deep, in Cymodocea nodosa field, Cetraro, Calabria, SW. Italy. 5,5mm.
Same spot. 4,1-5,4mm.

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