Graphis gracilis ( Monterosato, 1874 )

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 : 78-79

Graphis gracilis ( Monterosato, 1874)

Fig. 18 d–f

Cioniscus gracilis Monterosato, 1874 (p. 264).

Cioniscus gracilis Jeffreys—Jeffreys 1884 [b] (p. 341, pl. 26, fig. 1).

Aclis (Cioniscus) gracilis, Jeffreys—Kobelt 1905 (p. 63, pl. 64, Figs. 18–19 ).

Aclis gracilis Jeffreys—Hidalgo 1917 (p. 112).

Graphis gracilis ( Monterosato, 1874 ex Jeffreys ms.)— Cossignani et al. 1992 (fig. 118); Cachia et al. 1996 (p. 141, pl. 15, fig. 11); Repetto et al. 2005 (p. 161, mid right fig.).

Graphis gracilis ( Monterosato, 1874) — Beck et al. 2006 (p.88, top fig.); Peñas et al. 2006 (p. 130, figs. 305–307).

Diagnostic characters. Slender, turreted shell; spire whorls distinctly convex; periphery at the adapical one third; oval aperture; 12–13 sinuous axial ribs per whorl. Protoconch: stout, broadly conical; slightly more than 2 whorls; diameter about 430 µm; height about 540 µm; distinct submedian spiral keel and some weaker ones abapically and adapically; irregular commarginal wrinkles between the keels; sparse pits throughout; transition to the teleoconch marked by a simple sinuous lip.

Remarks. WoRMS (2016) places the genus Graphis into the family Tofanellidae Bandel, 1995 . Occurrence. Box-corer sample BC72 (1 specimen); core BC04 (1). Maximum height: 2 mm. Distribution and habitat. The species seems to be restricted to the Mediterranean and the nearby Atlantic (Bay of Biscay and Lusitanian seamounts), on circalittoral to bathyal mud ( Kobelt 1905; Di Geronimo et al. 2001; Beck et al. 2006; Peñas et al. 2006).

Fossil record. Pliocene of Sicily (Seguenza 1876[b]); Pleistocene of southern Italy (Di Geronimo & La Perna 1997; Di Geronimo et al. 2005).

Figures

FIGURE 18. a – c: Turbonilla micans (Monterosato, 1875), sample BC 51, scale bars: 0.5 mm (a), 0.2 mm (b – c, protoconch); d – f: Graphis gracilis (Monterosato, 1874), sample BC 72, scale bars: 0.5 mm (d), 0.2 mm (e – f, protoconch); g – i: Crenilabium exile (Jeffreys, 1870), samples BC 67 (g) and BC 04 (h – i), scale bars: 2 mm (g), 0.2 mm (h – i, protoconch); j – l: Japonacteon pusillus (MacGillivray, 1843), sample BC 72, scale bars: 2 mm (j), 0.2 mm (k – l, protoconch); m – o: Callostracon thyrrenicum (Smriglio & Mariottini, 1996), sample BC 71, scale bars: 1 mm (m), 0.2 mm (n – o, protoconch).

FIGURE 19. a – b: Ringicula sp., sample BC 72, scale bars: 0.5 mm (a), 0.1 mm (b, protoconch); c – d: Diaphana globosa (Lovén, 1846), sample BC 05, scale bars: 1 mm (c), 0.2 mm (d, protoconch); e – f: Diaphana cf. lactea (Jeffreys, 1877), sample BC 05, scale bars: 1 mm (e), 0.2 mm (f, protoconch); g – j: Philine quadrata (Wood, 1839), samples BC 72 (g – h) and BC 05 (i – j), scale bars: 2 mm (g – h), 0.2 mm (i – j, protoconch); k – n: Philine scabra (Müller, 1784), sample BC 72, scale bars: 2 mm (k), 0.5 mm (l, juvenile), 0.2 mm (m – n, protoconch); o – q: Roxania monterosatoi Dautzenberg & Fischer, 1896, samples BC 67 (o) and BC 72 (p – q), scale bars: 1 mm (o), 0.5 mm (p, juvenile), 0.2 mm (q, protoconch).