Drilliola emendata ( Monterosato, 1872 )

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 : 65-66

Drilliola emendata ( Monterosato, 1872)

Fig. 14 n–p

Taranis emendata Monterosato, 1872 (p. 17, 34).

Homotoma emendatum Monterosato—Hidalgo, 1917 (p. 355).

Asthenotoma (Drilliola) emendata (Monterosato) — Nordsieck 1968 (p. 157, pl. 26, fig. 91.10); Di Geronimo & Panetta 1973 (p. 83, pl. 1, figs. 8–9); Di Geronimo 1975 (p. 127, pl. 1, fig. 8).

Drilliola emendata (Monterosato, 1870) — Nordsieck 1977 (p. 18, pl. 2, fig. 13).

Drilliola emendata (Monterosato) — Sabelli & Spada 1977 (p. 2, fig. 5; not fig. 6 = Drilliola loprestiana ).

Drilliola emendata ( Monterosato, 1872) — Bouchet & Warén 1980 (p. 32, figs. 29, 83, 207); Cossignani et al. 1992 (fig. 173); Repetto et al. 2005 (p. 205, top right fig.).

Diagnostic characters. Slender fusiform shell; obliquely oval aperture; moderately long and twisted siphonal canal; shallow C-shaped anal sinus; thin spiral keels (the most prominent placed halfway between sutures) increasing in number by intercalation during growth; dense and very sinuous superimposed collabral riblets; base with several distinct spiral cords. Protoconch: stout, low conical; slightly less than 2.5 whorls; diameter about 870 µm; height about 840 µm; surface finely granulated; spiral keel at the abapical third; adapical weaker keel high on first whorl, later reduced; faint axial ribs on the last 0.5 whorl; transition to the teleoconch ill-defined, marked by the appearance of the adult sculpture.

Occurrence. Box-corer samples BC67 (1 specimen), BC72 (3); core BC72 (1). Maximum height: 8 mm.

Distribution and habitat. Drilliola emendata is distributed across the Mediterranean; in the Atlantic it seems to be restricted to Iberian and northwestern African coasts. It is a bathyal species sporadically found at circalittoral depths ( Hidalgo 1917; Di Geronimo & Panetta 1973; Bouchet & Warén 1980; Di Geronimo et al. 2001).

Fossil record. Upper Miocene to Lower Pliocene of Malaga, Spain ( Vera-Pelaez et al. 1999); Pliocene of Sicily ( Monterosato 1872; Cipolla 1914); Pleistocene of southern Italy ( Di Geronimo 1975; Di Geronimo & La Perna 1997; Di Geronimo et al. 2005).

Figures

FIGURE 14. a – c: Pagodula echinata (Kiener, 1840), sample BC 72, scale bars: 5 mm (a), 0.5 mm (b – c, protoconch); d – g: Nassarius lima (Dillwyn, 1817), sample BC 72, scale bars: 5 mm (d), 1 mm (e, juvenile), 0.5 mm (f – g, protoconch); h – j: Amphissa acutecostata (Philippi, 1844), sample BC 72, scale bars: 2 mm (h), 0.5 mm (i – j, protoconch); k – m: Fusinus rostratus (Olivi, 1792), sample BC 72, scale bars: 5 mm (k), 0.5 mm (l – m, protoconch); n – p: Drilliola emendata (Monterosato, 1872), sample BC 67, scale bars: 2 mm (n), 0.5 mm (o – p, protoconch).