Poromya granulata ( Nyst & Westendorp, 1839 )

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 : 45

Poromya granulata ( Nyst & Westendorp, 1839)

Fig. 10 d–e

Corbula granulata Nyst & Westendorp, 1839 (p. 398, fig. 3).

Poromya granulata Nyst & Westendorff—Jeffreys 1882 [a] (p. 936).

Poromya granulata Nyst—Hidalgo, 1917 (p. 567).

Poromya granulata (Nyst and Westendorp) — Tebble 1966 (p. 202, text-figs. 107a–c).

Poromya granulata ( Nyst und Westendorp, 1839)— Nordsieck 1969 p. 171, pl. 24, fig. 97.00).

Poromya granulata ( Nyst & Westendorp, 1839) — Barash & Danin 1992 (p. 321); Salas 1996 (p. 72, figs. 106–108); Repetto et al. 2005 (p. 352, bottom left fig.); Oliver et al. 2016 (online resource).

Poromya granulata ( Nyst and Westendorp, 1839) — Poppe & Goto 1993 (p. 138).

Diagnostic characters. Oval thin shell; truncate subvertical posterior margin; radial angulation from the beaks to the postero-ventral angle; radial rows of minute, subcylindrical pustules. Prodissoconch: not available.

Remarks. Poromya granulata , as figured in literature, seems to exhibit some degree of variability in terms of heigth/length ratio, shape of the anterior side (rounded to oval), sharpness of the posterior angulation and heigth of the posterodorsal area.

Occurrence. Box-corer sample BC72 (1 specimen); cores BC05 (5), BC72 (1). Maximum length: 3 mm.

Distribution and habitat. The species is distributed from boreal and subarctic northern Atlantic waters southward to Brazil and Senegal, entering the Mediterranean as far east as Israel. It is a mud burrower found from about 30 to 1300 m depth, gradually deepening moving southward ( Nordsieck 1969; Barash & Danin 1992; Poppe & Goto 1993; Oliver et al. 2016).

Fossil record. Pliocene of southern Italy ( Monterosato 1872); bathyal Pleistocene of southern Italy (Di Geronimo & La Perna 1997).

Figures

FIGURE 10. a – c: Allogramma formosa (Jeffreys, 1882); RV, sample BC 72, scale bars: 2 mm (a – b), 0.1 mm (c, prodissoconch); d – e: Poromya granulata (Nyst & Westendorp, 1839); LV, sample BC 72, scale bar 1 mm; f – h: Cuspidaria lamellosa (Sars G. O. ex Sars M., 1872); RV (f, h) and LV (g), sample BC 72, scale bars: 1 mm (f – g), 0.1 mm (h, prodissoconch); i – k: Cuspidaria rostrata (Spengler, 1793); RV, samples BC 66 (i – j) and BC 72 (k), scale bars: 5 mm (i – j), 0.1 mm (k, prodissoconch); l – n: Tropidomya abbreviata (Forbes, 1843); LV, sample BC 72, scale bars: 5 mm (m), 2 mm (l, juvenile), 0.1 mm (n, prodissoconch); o – q: Cardiomya costellata (Deshayes, 1835); RV, sample BC 72, scale bars 2 mm (o – p), 0.1 mm (q, prodissoconch).