Ringicula

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 : 81

Ringicula sp.

Fig. 19 a–b

Diagnostic characters. Oval, rather inflated shell; stepped whorl profile with canaliculate suture; crescent-shaped aperture; 2 ascending columellar folds; no trace of parietal fold; barely incised spiral grooves, more closely spaced towards the base. Protoconch: heterostophic, coaxially immersed; rather globose; 1 visibile whorl; diameter about 310 µm; surface smooth; transition to the teleoconch marked by a simple orthocline lip.

Remarks. A single juvenile and partially broken specimen was at hand. The present specimen exhibits some resemblance with R. gianninii Nordsieck, 1974 ; however, its juvenile stage and poor preservation hinder a reliable assignment to species.

Occurrence. Box-corer sample BC72 (1 specimen). Height: 1.5 mm.

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).