Teretia teres ( Reeve, 1844 )

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 : 68-69

Teretia teres ( Reeve, 1844)

Fig. 15 m–p

Pleurotoma teres Reeve, 1844 (species n. 161, pl. 19, fig. 161).

Homotoma anceps Eichwald—Hidalgo 1917 (p. 354).

Teretia anceps (Eichwald) — Nordsieck 1968 (p. 179, pl. 30, fig. 94.80).

Teretia anceps (Eichwald, 1830) — Nordsieck 1977 (p. 61, pl. 19, fig. 161).

Teretia teres ( Forbes, 1844) — Bouchet & Warén 1980 (p. 81, figs. 168, 229); Giribet & Peñas 1997 (fig. 69).

Teretia teres ( Reeve, 1844) — Fretter & Graham 1984 (p. 543, figs. 373–374); Poppe & Goto 1991 (p. 168, pl. 35, fig. 7); Cossignani et al. 1992 (fig. 182); Repetto et al. 2005 (p. 221, top right fig.); Beck et al. 2006 (p. 80, bottom fig.); De Frias Martins et al. 2009 (p. 65, figs. 246–247).

Diagnostic characters. Fusiform shell; oval aperture; moderately long, wide and twisted siphonal canal; deep Ushaped anal sinus; sharp spiral cords increasing in number by intercalation during growth; most prominent cord marking periphery of whorls; minute granulation in interspaces between spirals. Protoconch: conical; 4.5 whorls; diameter about 540 µm (protoconch I: 200 µm); height about 800 µm; first 1.3 whorls (protoconch I) with spirally connected T-shaped granules; subsequent whorls (protoconch II) with an oblique reticulate pattern of sinuous, collabral axial riblets and non-collabral prosocline riblets; the latter riblets absent in the adapical fourth, where only collabral riblets are present; transition to the teleoconch marked by a sinusigera.

Remarks. Teretia anceps (Eichwald, 1830) is a Miocene fossil. According to Bouchet & Warén (1980), its Recent citations actually refer to Teretia teres .

Occurrence. Box-corer samples BC04 (2 specimens), BC11 (1), BC72 (4); cores BC04 (1), BC05 (6), BC21 (2), BC51 (4). Maximum height: 3.5 mm.

Distribution and habitat. Teretia teres is distributed from Scandinavian waters to Angola, the Canaries, the Azores and the Mediterranean; it dwells on sand and sandy mud bottoms in the 30–1385 m bathymetric interval ( Bouchet & Warén 1980; Fretter & Graham 1984; Poppe & Goto 1991; Pons-Moyà & Pons 1999).

Fossil record. Pliocene and Pleistocene of Italy ( Monterosato 1872; Di Geronimo & La Perna 1997; Tabanelli 2008).

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).