Emarginula adriatica

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 : 52

Emarginula adriatica Costa O.G., 1830

Fig. 11 l–n

Emarginula adriatica Costa O.G., 1830 (pp. 119, 122).

Emarginula adriatica O.G. Costa, 1829 — Poppe & Goto 1991 (p. 67, pl. 2, fig. 17); Mastrototaro et al. 2010 (fig. 5 d). Emarginula adriatica Costa O.G., 1829— Cossignani et al. 1992 (fig. 020); Giannuzzi-Savelli et al. 1994 (p. 46, figs. 73–74);

Repetto et al. 2005 (p. 74, bottom right fig.); Beck et al. 2006 (p. 40, bottom fig.); Crocetta & Spanu 2008 (p. 68, fig. 3M). Emarginula adriatica (Costa O.G., 1829)— Portalatina 2008 (p. 149, figs. 3A–F).

Diagnostic characters. Elevated limpet-shaped shell; oval basal outline; recurved apex nearly reaching the posterior margin; anal slit moderately deep and adapically rounded; selenizone bordered by raised flanges; strong, nodulose to spiny radial ribs gradually increasing in number by intercalation; densely packed concentric riblets in the interspaces. Protoconch: almost planispiral, slightly turned to the right; 1.25 whorls; diameter about 170 µm; fine, irregularly shaped granules roughly arranged in spiral alignments; transition to the teleoconch marked by a low varix.

Remarks. Although dated 1829, the work by Costa was published in 1830 according to Fasulo (2013).

Occurrence. Box-corer samples BC22 (2 specimens), BC66 (2), BC71 (12), BC72 (6); core BC67 (1). Maximum length: 11 mm.

Distribution and habitat. The species is distributed in the Mediterranean and adjacent Atlantic waters ( Spain to the Canaries), including seamounts ( Poppe & Goto 1991; Beck et al. 2006); it is often found associated with deep-water corals, e.g. Corallium rubrum off Sardinia coasts, possibly feeding on Porifera ( Beck et al. 2006; Crocetta & Spanu 2008). In the Santa Maria di Leuca CWC biotope, it was found on dead colonies of Madrepora oculata (Mastrototaro et al. 2010) , rarely occurring in solitary coral thanatofacies (Rosso et al. 2010). Fossil record. Pliocene of Sicily ( Monterosato 1872).

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).