Drilliola loprestiana ( Calcara, 1841 )

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 : 66

Drilliola loprestiana ( Calcara, 1841)

Fig. 15 a–d

Pleurotoma loprestiana Calcara, 1841 (p. 89).

Pleurotoma (Mangilia) comatotropis Dall, 1881 (p. 58).

Mangilia comatotropis Dall—Dall 1889 [a] (p. 116, pl. 11, fig. 12).

Homotoma loprestiana Calcara—Hidalgo 1917 (p. 355).

Acrobela loprestiana (Calcara) — Nordsieck 1968 (p. 157, pl. 26, fig. 91.00).

Asthenotoma (Drilliola) loprestiana (Calcara) — Di Geronimo & Panetta 1973 (p. 82, pl. 1, fig. 12).

Acropota loprestiana ( Calcara, 1841) — Nordsieck 1977 (p. 18, pl. 2, figs. 14–15).

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

Drilliola loprestiana ( Calcara, 1841) — Bouchet & Warén 1980 (p. 32, figs. 82, 208–209); Poppe & Goto 1991 (p. 169, pl. 35, fig. 5); Barash & Danin 1992 (p. 151, fig. 172); Repetto et al. 2005 (p. 205, mid left fig.).

Microdrillia loprestiana ( Calcara, 1841) — Cossignani et al. 1992 (fig. 174); Giribet & Peñas 1997 (p. 74, fig. 56).

Diagnostic characters. Biconical-fusiform shell; obliquely oval aperture; wide and twisted siphonal canal; moderately deep U-shaped anal sinus; sharp spiral keels, the most prominent bordering the subsutural shelf; thin, sinuous collabral riblets in the interspaces between spirals. Protoconch: conical; 5.5 whorls; diameter about 810 µm (protoconch I: 270 µm); height about 1250 µm; first 2 whorls (protoconch I) densely granulated; subsequent whorls (protoconch II) with opisthocyrt collabral riblets, fine spiral threads and sparse granules; transition to the teleoconch marked by a deeply sinuated lip.

Remarks. Drilliola comatotropis ( Dall, 1881) is currently regarded as a junior synonym ( Bouchet & Warén 1980; CLEMAM 2016).

Occurrence. Box-corer sample BC05 (2 specimens); cores BC05 (5), BC51 (2), BC67 (1). Maximum height: 2.5 mm.

Distribution and habitat. The species is distributed on both sides of the Atlantic, from Georgia to Brazil and from the Bay of Biscay to West Africa, the Azores and the Mediterranean; it dwells on bathyal soft bottoms, being apparently shallower at some Mediterranean locations ( Di Geronimo & Panetta 1973; Bouchet & Warén 1980; Pons-Moyà & Pons 1999; Di Geronimo et al. 2001).

Fossil record. Type-locality of the species: Pliocene or Pleistocene of Sicily ( Calcara 1841); Pleistocene of Sardinia ( Di Geronimo & Bellagamba 1985).

Figures

FIGURE 15. a – d: Drilliola loprestiana (Calcara, 1841), sample BC 05, scale bars: 1 mm (a), 0.5 mm (b – c, protoconch), 0.1 mm (d, PI detail); e – h: Mangelia nuperrima (Tiberi, 1855), samples BC 05 (e) and BC 72 (f – h), scale bars: 2 mm (e), 0.5 mm (f – g, protoconch), 0.1 mm (h, PI detail); i: Mangelia serga (Dall, 1881), sample BC 72, scale bar 2 mm; j – l: Pleurotomella eurybrocha (Dautzenberg & Fischer, 1896), sample BC 21, scale bars: 0.5 mm (j), 0.2 mm (k – l, protoconch); m – p: Teretia teres (Reeve, 1844), sample BC 72, scale bars: 1 mm (m), 0.2 mm (n – o, protoconch), 0.1 mm (p, PI detail); q – t: Pleurotomella demosia (Dautzenberg & Fischer, 1896), sample BC 71, scale bars: 2 mm (q), 0.2 mm (r – s, protoconch), 0.1 mm (t, PI detail).