Similipecten similis ( Laskey, 1811 )

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 : 28-29

Similipecten similis ( Laskey, 1811)

Fig. 5 m–o

Pecten similis Laskey, 1811 (p. 387, pl. 8, fig. 8).

Pecten similis Laskey—Jeffreys 1879 (p. 560).

Palliolum simile (Lask.) — Sacco 1897 (p. 45, pl. 13, figs. 19–25).

Chlamys similis Laskey—Hidalgo 1917 (p. 238).

Similipecten similis (Laskey) — Tebble 1966 (p. 63, text-fig. 26).

Palliolum (Similipecten) similis ( Laskey, 1811) — Nordsieck 1969 (p. 44, pl. 7, fig. 30.05). Palliolum (Similipecten) simile (Laskey) — Di Geronimo & Panetta 1973 (p. 99). Palliolum (Delectopecten) simile (Lask.) — Brambilla 1976 (p. 99, pl. 24, figs. 6–7). Palliolum similis ( Laskey, 1811) — Barash & Danin 1992 (p. 254).

Hyalopecten (Similpecten) similis [sic] ( Laskey, 1811)— Cossignani et al. 1992 (fig. 285).

Similipecten similis ( Laskey, 1811) — Poppe & Goto 1993 (p. 71, pl. 10, fig. 8); Giannuzzi-Savelli et al. 2001 (p. 172, fig. 327); Repetto et al. 2005 (p. 298, mid right fig.); Beck et al. 2006 (p. 99, bottom fig.); Oliver et al. 2016, (online resource).

Diagnostic characters. Shell oval, longer than high; bluntly pointed anterior side; subequal auricles; smooth outer surface. Prodissoconch: shell type ST-2D; length about 120 µm; roundish D-shaped outline; low convex profile; P- 1 surface pitted; rim-like P-2 barely separated from P-1; transition to the nepioconch well marked.

Occurrence. Box-corer samples BC66 (1 specimen), BC71 (1), BC72 (6); core BC72 (1). Maximum height: 4 mm.

Distribution and habitat. The species is reported to have a cosmopolitan distribution, usually on sand (often coralline sand) and fine gravel with a variable amount of mud, from infralittoral to bathyal depths ( Nordsieck 1969; Poppe & Goto 1993; Oliver et al. 2016).

Fossil record. Miocene of Poland, France and Italy; Pliocene of the Mediterranean, Belgium and Great Britain; Pleistocene of Denmark, Italy and Great Britain ( Monterosato 1872; Sacco 1897; Brambilla 1976; Barrier et al. 1987; Monegatti & Raffi 2001; Petersen 2004).

Figures

FIGURE 5. a – d: Delectopecten vitreus (Gmelin, 1791); RV (a, c, d) and LV (b), sample BC 72, scale bars: 5 mm (a – b), 1 mm (c, juvenile), 0.1 mm (d, prodissoconch); e – g: Parvamussium fenestratum (Forbes, 1844); LV, samples BC 70 (e – f) and BC 72 (g), scale bars: 5 mm (e – f), 0.1 mm (g, prodissoconch); h – l: Cyclopecten hoskynsi (Forbes, 1844); RV (h, i, l) and LV (j, k), sample BC 72, scale bars: 5 mm (h – k), 0.1 mm (l, prodissoconch); m – o: Similipecten similis (Laskey, 1811); RV (n, o) and LV (m), sample BC 72, scale bars: 1 mm (m – n), 0.05 mm (o, prodissoconch).