Trianguloscalpellum ovale (Hoek, 1883)

Fig. 32

Scalpellum regium Wyville-Thomson, 1873: in part, only figs 1–2; Wyville-Thomson, 1877: in part, figs 2–3; Pilsbry, 1907a: in part, only pl. III, fig. 4.

Scalpellum regium ovale: Hoek, 1883: 109, pl. V, figs 5–6.

Scalpellum gigas Gruvel, 1902a: 52, 126, pl. II, fig. 3A, pl. III, figs 22–26 [not Scalpellum gigas Hoek, 1883 = Trianguloscalpellum ovale (Hoek, 1883)].

Trianguloscalpellum gigas: Foster & Buckeridge, 1995b: 169, fig. 2E [not Scalpellum gigas Hoek, 1883) = Trianguloscalpellum ovale (Hoek, 1883)].

Trianguloscalpellum regium ovale: Zevina, 1981a: 311, fig. 235.

Trianguloscalpellum ovale: Young, 1998b: 32–33, fig. 21a, b; 1999a: 181; 2001a: 741; 2001b: 464, fig. 7; 2002: 342; Poltarukha & Zevina, 2006b: 166, fig. 4; Poltarukha, 2010: 455–457, fig. 456.

Material examined. Holotype NHM UK 2013.1126, Stn 61: Atlantic, Western Central (North Western Atlantic Basin); 5210 m.

Supplementary description. Poltarukha & Zevina (2006b).

Distribution. Atlantic, Northwest, Northeast and Western Central. Known depth range 1199 to 5315 m.

Habitat. Natural and artificial substrata (Poltarukha, 2010).

Remarks. This material was dredged together with T. regium regium (W. Thomson, 1873) and it was initially considered as a subspecies. However, Young (1998 b) separated T. ovale as a distinct species based on shell plate characters. Trianguloscalpellum ovale is also similar to T. gigas, but differs in the tectum of the carina and the peduncular plates (Young, 1998b).