Parthenina flexuosa (Monterosato, 1874)
Azores to Cabo Verde, to Central Mediterranean.
Ectoparasit in the infralittoral, down to « a considerable depth » according to Monterosato (at least -480m, as mentioned in van der Linden & Eikenboom, 1992 – cf. infra).
Original taxon: Odostomia flexuosa.
On beach, Málaga, Andalucia, S. Spain. 1,5mm.
« Shell small, solid but delicate, subcylindrical, white or cream-coloured with blunt apex. Protoconch type C tending to B (see Linden & Eikenboom, 1992). Whorls slightly convex. Suture distinct, moderately deep. Axial ribs not very elevated, flexuous and orthocline or slightly ophistocline. The axial ribs are about as broad as interspaces, disappearing at the periphery of the ultimate whorl or continuing on the base as diffuse lines. » – Lygre & al.: “Three species of Parthenina new to West Africa”, Journal of Conchology vol. XL, London 2011, p. 480 via ResearchGate.

Synonym: interspatiosa van der Linden & Eikenboom, 1992.
Same spot. 1,8mm.
« Spiral sculpture consisting of a thin ridge abapically, two in ultimate whorl. The spiral ridge is sometimes weak and difficult to observe. When axial ribs end at the periphery the lowermost ridge of the ultimate whorl is more like a border at the base. Aperture oval, apically narrowed. A small tooth can be seen if the shell is turned left. The umbilical fissure is narrow. »Ibid.

Cap Croisette, Les Goudes, S. of Marseille, Provence, S. France. E. Vial legit (FR). 2mm.

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