Cirsonella romettensis ( Granata-Grillo, 1877 )

Negri, Mauro Pietro & Corselli, Cesare, 2016, Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy), Zootaxa 4186 (1), pp. 1-97 : 54

Cirsonella romettensis ( Granata-Grillo, 1877)

Fig. 12 e–g

Oxystele romettensis Granata-Grillo, 1877 (p. 7).

Tharsis romettensis Seguenza—Jeffreys 1883 [b] (p. 93, pl. 19, fig. 7).

Cirsonella romettensis ( Granata, 1877) —Warén 1991[a] (p. 160, figs. 4C, 9E, 11C–E, 12A).

Cirsonella romettensis (Seguenza G., 1873) — Giannuzzi-Savelli et al. 1994 (p. 106, fig. 350); Repetto et al. 2005 (p. 91, top right fig.).

Cirsonella romettensis ( Granata-Grillo, 1877) — Beck et al. 2006 (p. 48, mid fig.).

Diagnostic characters. Globose-conoidal shell; moderately low spire; circular and slightly prosocline aperture; thick parietal callus often closing the umbilical chink; smooth and glossy outer surface. Protoconch: very low conical; 1.25 whorls; diameter about 260 µm; surface finely granulated; transition to the teleoconch marked by a thin, slightly everted lip.

Occurrence. Core BC67 (1 specimen). Height: 2 mm.

Distribution and habitat. Cirsonella romettensis is a NE Atlantic (as far South as the Azores) and Mediterranean species; it is a stenobathic element living on small hard substrates in the 100–1000 m depth interval, being commonly recovered from present-day Gryphus vitreus bottoms ( Dautzenberg 1889; Corselli & Bernocchi 1988; Warén 1991[a]). It was regarded as an element of CB (deep-sea white corals) biocoenosis ( Di Geronimo et al. 1982).

Fossil record. Pliocene and Pleistocene of Italy (Warén 1991[a]; Di Geronimo & La Perna 1997; Di Geronimo et al. 1997; Di Geronimo et al. 1982; Di Geronimo et al. 2005).

Figures

FIGURE 12. a – c: Anatoma aspera (Philippi, 1844), sample BC 71, scale bars: 1 mm (a – b), 0.1 mm (c, protoconch); d: Danilia tinei (Calcara, 1839), sample BC 72, scale bar 5 mm; e – g: Cirsonella romettensis (Granata – Grillo, 1877), sample BC 67, scale bars: 1 mm (e – f), 0.1 mm (g, protoconch); h – j: Putzeysia wiseri (Calcara, 1842), sample BC 66, scale bars: 2 mm (h), 0.2 mm (i – j, protoconch); k – m: Mikro? sp., sample BC 52, scale bars: 0.2 mm (k – l), 0.1 mm (m, protoconch); n – p: Adeuomphalus densicostatus (Jeffreys, 1884), sample BC 72, scale bars: 0.2 mm (n – o), 0.1 mm (p, protoconch).