Emarginula multistriata Jeffreys, 1882

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 : 53

Emarginula multistriata Jeffreys, 1882

Fig. 11 o–q

Emarginula multistriata Jeffreys, 1882 [b] (p. 30).

Emarginula multistriata Jeffreys—Jeffreys 1883 [a] (p. 680, pl. 50, fig. 12); Hidalgo 1917 (p. 303); Nordsieck 1968 (p. 11, pl. 1, fig. 03.07).

Emarginula multistriata Jeffreys, 1882 — Ghisotti & Melone 1969 (p. 22, fig. 03.07); Bogi & Giusti 1994 (pp. 41–44, figs. 1– 4); Repetto et al. 2005 (p. 75, bottom left fig.).

Diagnostic characters. Elevated and limpet-shaped shell; oval basal outline; recurved apex extending beyond the posterior margin; anal slit moderately deep and adapically rounded; selenizone bordered by raised flanges; strong, nodulose radial ribs gradually increasing in number by intercalation; concentric ribs forming a squarish reticulated patern with the radials. Protoconch: almost planispiral, slightly turned to the right; 1.25 whorls; diameter about 180 µm; surface with flocculent sculpture; transition to the teleoconch marked by a cord-like varix.

Remarks. The present species differs from E. adriatica in having a more recurved apex, lunulae not emerging from the selenizone, and radial and commarginal ribs of equal strenght.

Occurrence. Box-corer samples BC11 (1 specimen), BC66 (1), BC70 (1), BC71 (3), BC72 (1). Maximum length: 9 mm.

Distribution and habitat. Emarginula multistriata is distributed in the Mediterranean and nearby Atlantic waters, from the Gulf of Gascogne to the Canaries and Morocco; it is a circalittoral to bathyal species, often associated with deep water white corals ( Ghisotti & Melone 1969; Poppe & Goto 1991; Bogi & Giusti 1994).

Fossil record. Lower Pleistocene of Sicily, in need for confirmation ( Di Geronimo et al. 2005); the species was formerly considered extinct in the Mediterranean since the Pleistocene, but living specimens were recently found in the Thyrrenian Sea ( Bogi & Giusti 1994).

Figures

FIGURE 11. a – c: Antalis agilis (Sars M. in Sars G. O., 1872), samples BC 04 (a) and BC 72 (b – c), scale bars: 5 mm (a), 0.2 mm (b, posterior aperture), 1 mm (c, anterior aperture); d – f: Entalina tetragona (Brocchi, 1814), sample BC 72, scale bars: 2 mm (d), 0.1 mm (e, posterior aperture), 0.5 mm (f, anterior aperture); g: Cadulus subfusiformis (Sars M., 1865), sample BC 52, scale bar 0.5 mm; h – k: Propilidium exiguum (Thompson, 1844), sample BC 66, scale bars: 1 mm (h – i), 0.1 mm (j – k, protoconch); l – n: Emarginula adriatica (Costa O. G., 1830), sample BC 72, scale bars: 2 mm (l – m), 0.1 mm (n, protoconch); o – q: Emarginula multistriata Jeffreys, 1882, sample BC 70, scale bars: 1 mm (o – p), 0.1 mm (q, protoconch); r – t: Emarginula tenera Locard, 1982, sample BC 71, scale bars: 1 mm (r – s), 0.1 mm (t, protoconch).