Scalpellum stearnsii Pilsbry, 1890

Figures 2 C, 18

Material examined. CEL-BB-56, 1 specimen, Nan Fang Ao Fishing market (27 May 2004), CL 34.6 mm, CW 22.84 mm, PL 26.27 mm.

Diagnosis. Carina strongly bowed; tergum triangular; scutum with umbo at tergo-occludent angle; inframedian latus pentagonal, umbo sub-basal; carinolateral horn-shaped, umbo at basicarinal angle, angle extending beyond carina.

Description. Capitulum almost square-shaped; 14 perfectly calcified plates, covered by yellow membrane (Fig. 2 C); tergum triangular, umbo apical, tergal margin slightly convex (Fig. 2 C); scutum quadrilateral, lateral margin concave (Fig. 2 C); upper latus pentagonal (Fig. 2 C); inframedian latus pentagonal, smaller than upper latus, umbo submedial (Fig. 2 C); carinolatus strongly curved, horn-shaped, extending beyond carina, umbo apical (Fig. 2 C); rostrolatus wider than high, narrow; rostrum small (Fig. 2 C); carina strongly bowed, thick. Peduncle long, cylindrical, covered by calcified scales (Fig. 2 C); peduncular scales arranged in concentric patterns (Fig. 2 C). Maxilla subtriangular with fine setae (Fig. 18 A); maxillule without a clear notch,> 35 strong cuspidate setae on cutting edge (Fig. 18 B); mandible with 5 major teeth excluding inferior angle (Fig. 18 C), lower margin with fine denticles, inferior angle terminating in dense setae (Fig. 18 C); mandibular palps elongated, narrow, with serrulate-type setae on superior margin (Fig. 18 D); labrum strongly V-shaped, with fine teeth on cutting edge. Cirrus I with rami unequal, inner ramus oval (12-segmented), outer ramus long, slender (18-segmented) (Fig. 18 E); cirri II–VI similar in morphology, rami almost equal length, outer and inner rami 25–36-segmented (Fig. 18 F); caudal appendages short, 5–6 segmented (Fig. 18 G).

Distribution. Indo-Pacific waters including Taiwan.

Remarks. The Nan Fang Ao fishing market is a local deep-sea fishery market in Taiwan, selling fishery catches collected daily by the fishermen operating in the deep-sea in the eastern Taiwanese waters. The sample collected in the Nan Fang Ao fish market was found among the local catches from the fishermen.