Diaphana cf. lactea ( Jeffreys, 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 : 82

Diaphana cf. lactea ( Jeffreys, 1877)

Fig. 19 e–f

Utriculus lacteus Jeffreys, 1877 (p. 334).

Diaphana jonica Di Geronimo, 1974 (p. 151, pl. 2, fig. 2).

Diaphana lactea ( Jeffreys, 1877) — Repetto et al. 2005 (p. 255, mid left fig); Ohnheiser & Malaquias 2014 (p. 507, figs. 5–6).

Diagnostic characters. Ovate-cylindrical shell; moderately wide ear-shaped aperture; barely reflexed basal lip; very narrow umbilical chink; outer surface smooth except for growth lines. Protoconch: heterostrophic, half immersed, transaxial; about 2 visible whorls; diameter about 300 µm; surface smooth; transition to the teleoconch marked by a thin orthocline lip.

Remarks. The present specimen resembles D. lactea , except for the lack of the spiral striation mentioned in Jeffreys’ original description. Diaphana jonica Di Geronimo, 1974 is currently regarded as a junior synonym of D. lactea (CLEMAM 2016).

Occurrence. Box-corer sample BC05 (1 specimen). Height: 2.5 mm.

Distribution and habitat. Diaphana lactea seems to range from northern to the central Atlantic and the Mediterranean, being more commonly found in deep bathyal settings ( Linse & Schiøtte 2002; Høisaeter 2009, 2010).

Fossil record. None recorded.

Figures

FIGURE 19. a – b: Ringicula sp., sample BC 72, scale bars: 0.5 mm (a), 0.1 mm (b, protoconch); c – d: Diaphana globosa (Lovén, 1846), sample BC 05, scale bars: 1 mm (c), 0.2 mm (d, protoconch); e – f: Diaphana cf. lactea (Jeffreys, 1877), sample BC 05, scale bars: 1 mm (e), 0.2 mm (f, protoconch); g – j: Philine quadrata (Wood, 1839), samples BC 72 (g – h) and BC 05 (i – j), scale bars: 2 mm (g – h), 0.2 mm (i – j, protoconch); k – n: Philine scabra (Müller, 1784), sample BC 72, scale bars: 2 mm (k), 0.5 mm (l, juvenile), 0.2 mm (m – n, protoconch); o – q: Roxania monterosatoi Dautzenberg & Fischer, 1896, samples BC 67 (o) and BC 72 (p – q), scale bars: 1 mm (o), 0.5 mm (p, juvenile), 0.2 mm (q, protoconch).