Scabrilucina melvilli, Taylor, John D. & Glover, Emily A., 2013

Taylor, John D. & Glover, Emily A., 2013, New lucinid bivalves from shallow and deeper water of the Indian and West Pacific Oceans (Mollusca, Bivalvia, Lucinidae), ZooKeys 326, pp. 69-90 : 74-76

Scabrilucina melvilli sp. n. Figs 3C, 6

Type material.

Holotype: 1 whole shell (AM C. 360708), H 21.2 mm, L 21.0, T (single valve) 5.2 mm. Paratypes: single left valve, H 20.5mm, L 18.3 mm, juvenile shells 4 LV and 4 RV, locality as holotype (AM C. 479181).

Type locality.

Northeastern Australia,Queensland, E of Bowen 19°45.7'S, 148°19'E, 46 m, thin, grey mud, coll. PH Colman & F Rowe.

Other material examined.

Australia, Queensland: 6 valves (AM C. 036166), Albany Passage, Cape York Peninsula, 10°45'S, 142°37'E, 4-14 fthms (7-26 m), mud & sand, coll. C. Hedley & A. Mc Culloch. (3 LV, 3 RV+ juveniles. Left valves - H 26.3 mm, L 24.3 mm; H 24.3 mm, L 23.2 mm; H 23.3 mm, L 20.9 mm; right valves - 19.0 mm L 18.6 mm; H 18.7 mm, L 17.2 mm). 1 valve (AM C. 360707), Horn Island, Torres Strait, 10° 35.6S, 142°14.6'E, mangroves and sand flats, near jetty, coll. W.F. Ponder & I. Loch. (1 LV H 18.6 mm, L 17.3 mm).

Description.

Shell fragile, thin, white, semi-translucent, subtrigonal, L to 26.3 mm, H to 26.3 mm, higher than long H/L = 1.05 ± SD 0.04 (n = 9), moderately inflated T/L = 0.27 ± 0.02 (n = 9). Posterior sulcus broad, shallow with marginal sinus. Anterior dorsal area weakly defined. Sculpture (Fig. 6K, L) of regularly spaced, low, thin, sharp, commarginal lamellae with faint radial folds in interspaces. Commarginals more closely spaced in larger specimens. Commarginal lamellae elevated to scales along dorsal margin. Protoconch (Fig. 6M): 150 µm, PII a narrow rim. Lunule short, lanceolate, with more prominent growth increments in LV. Ligament short, set in groove. Hinge plate narrow (Fig. 6I, J), LV with two small cardinal teeth, anterior tooth larger, RV with single cardinal tooth, in larger specimens teeth sometimes obscure. Small anterior lateral present in RV of juveniles. Anterior adductor scar long, thin, detached ventrally from pallial line for ¾ of length at angle of 25°. Posterior adductor scar ovoid. Pallial line narrow, entire. Shell inside pallial line with small round points of mantle attachment, radial grooves, track of pallial blood vessel visible as shallow groove. Shell margin smooth.

Distribution.

Torres Strait, northeastern Australia (Fig. 4) shallow water mud to 50 m.

Remarks.

See above for comparison with Scabrilucina victorialis .

Etymology.

Named for James Cosmo Melvill (1845-1929), British malacologist who described many IWP species. Noun in genitive case.