Parthenina interstincta (J. Adams, 1797)
Norway to Cabo Verde, Madeira to Mediterranean, Black Sea.
Ectoparasit in the infralittoral-circalittoral.
Original taxon: Turbo interstinctus.
 
« Spire elongated composed of four whorls (not including the embryonic ones) convex, with thin, arched, slightly flexuous ribs and a decurrent cord at the base of the whorls a little above the suture, where it determines a well pronounced angle. This cord extends on the middle of the last whorl. Suture deep and canaliculate. Aperture oval; columella slightly arched, with a weak tooth. Labrum simple, rounded, slightly flexuous. Colour: uniform white. Operculum thin and flexible, very finely streaked. » – Bucquoy, Dautzenberg & Dollfus: Les mollusques marins du Roussillon vol. I, Paris 1883, p.170.

40-44m deep, Scilla, Messina Strait, SW. Italy. 1,3-2mm.
Synonyms: farolita, flexicosta, obtusa…
150-180m deep, Almería, Andalucia, S. Spain. 1,9mm.
« Concha alargada, cónica, muy polimorfa, de vueltas aplanadas y perfil casi rectilíneo; costillas axiales anchas; presenta un patente cordón espiral suprasutural; diente patent. » – Peñas, Templado & Martinez: “Contribución al conocimiento de los Pyramidelloidea (Gastropoda: Heterostropha) del Mediterráneo español”, Iberus vol. 14(1), Barcelona 1996, p.22.

Same spot. 1,85mm.

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