Cuspidaria lamellosa Sars M. in Sars G. O. 1878

Cuspidaria lamellosa (Sars M. in Sars G. O., 1878)

Fig. 10 f–h

Neaera lamellosa Sars M. in Sars G. O., 1878 (p. 88, pl. 6, figs. 9a–c).

Cuspidaria lamellosa M. Sars [in text] Sars [in plate]—Dall 1889[b] (p. 66, pl. 45, fig. 3). Cuspidaria lamellosa (M. Sars) Dall—Verrill & Bush 1989 (p. 799, pl. 74, fig. 10).? Cuspidaria jugosa (S. Wood, 1856) — Nordsieck 1969 (p. 176, pl. 25, fig. 98.74). Cuspidaria lamellosa (M. Sars, 1858) — Thomsen & Vorren 1986 (pl. 8, fig. A).

? Cuspidaria jugosa (Wood S., 1856) — Repetto et al. 2005 (p. 354, bottom right fig.). Cuspidaria lamellosa (G.O. Sars, 1872) — Oliver et al. 2016 (online resource).

Diagnostic characters. Oval shell; rounded anterior side; long and truncate posterior rostrum; right valve hinge with a strong posterior lateral tooth; radial ridge from the beaks to the ventral angle of the rostrum; rather evenly spaced commarginal lamellae, vanishing on the umbonal area and over the rostrum. Prodissoconch: shell type ST- 2D; length about 130 µm; ellipsoidal outline; convex profile; P-1 surface finely granulated; P-1/P-2 boundary illdefined; rim-like P-2; transition to the nepioconch well marked.

Remarks. G.O. Sars (1878, p. 88) erroneously considered the valid species Neaera lamellosa M. Sars as conspecific with Neaera jugosa S. Wood. Actually, Cuspidaria jugosa (Wood S.V., 1857), although subsequently put in synonymy of C. lamellosa by some authors (e.g. Nordsieck 1969), appears to be a different species, as Wood (1857: p. 272) described it as possessing “eight to ten rounded ridges, with depressions or sulci between them of about the same breadth”.

Occurrence. Box-corer samples BC05 (2 specimens), BC66 (1), BC72 (6); core BC72 (2). Maximum length: 3.5 mm.

Distribution and habitat. The species is found at outer shelf depths in Norway waters, and at deeper settings (down to 1100 m) along both the Atlantic margins; it is an infaunal burrower inhabiting soft bottoms (Dall 1889[b]; Thomsen & Vorren 1986; Buhl-Mortensen & Høisaeter 1993; Oliver et al. 2016).

Fossil record. Holocene of Norway (Thomsen & Vorren 1986).