Tropidomya abbreviata ( Forbes, 1843 )

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 : 48

Tropidomya abbreviata ( Forbes, 1843)

Fig. 10 l–n

Neaera abbreviata Forbes, 1843 (p. 75).

Neaera abbreviata Forbes—Jeffreys 1882 [a] (p. 943); Hidalgo 1917 (p. 493).

Cuspidaria (Tropidomya) abbreviata (Forbes) — Tebble 1966 (p. 205, text-fig. 110).

Tropidomya abbreviata ( Forbes, 1843) — Nordsieck 1969 (p. 173, pl. 24, fig. 98.30); Oliver et al. 2016 (online resource). Cuspidaria abbreviata ( Forbes, 1843) — Poppe & Goto 1993 (p. 139, pl. 26, fig. 7); Repetto et al. 2005 (p. 355, mid left fig). Cuspidaria (Tropidomya) abbreviata ( Forbes, 1843) — Salas 1996 (p. 76, figs. 129–130).

Diagnostic characters. Oval-trigonal shell; rather pointed beaks; short, rounded posterior rostrum; hinge with a very small cardinal tooth in each valve; single thin radial ridge from the beaks to the postero-ventral margin; shallow radial depression posterior to the ridge, corresponding to an internal strong fold. Prodissoconch: shell type ST-2D; length about 130 µm; slightly inequilateral (longer anteriorly), ellipsoidal outline; convex profile; P-1 surface with arcuate wrinkles in the cicatrix area; P-2 almost absent; transition to the nepioconch rather well marked.

Occurrence. Box-corer samples BC71 (3 specimens), BC72 (26); core BC72 (2). Maximum length: 7 mm.

Distribution and habitat. The species is distributed from northern Norway to Morocco and the Mediterranean, in the 460–1350 m depth interval ( Nordsieck 1969; Buhl-Mortensen & Høisaeter 1993; Poppe & Goto 1993; Oliver et al. 2016).

Fossil record. Pliocene of Sicily ( Monterosato 1872).

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).