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).