Hyalopecten bavayi (Dijkstra, 1990)
DIJKSTRA, H. H. 1990. Three new pectinacean species from the Indonesian Archipelago collected
during the Siboga Expedition (1899-1900), with additional information and
corrections on the previous report (Mollusca: Propeamussiidae, Pectinidae).
Beaufortia, 40 (1): 1-14, pls. 1, 2. [p. 5, pl. 2, fig. 9]
1990 Cyclopecten (Cyclopecten) bavayi Dijkstra, 1990
H. H. Dijkstra, 1990, plate 2.
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«Material examined. Holotype: one specimen, without soft parts (right valve broken). Measurements of left valve: height 6.8 mm, length 7 mm (ZMA Moll. no. 3.89.008).
Locus typicus. SIBOGA stat. 178. Indonesia, Ceram Sea, 2'40' S, 128"37'.5 E. Deep sea trawl. 835 m. Blue muddy bottom. 2 .IX. 1899.
Description. Shell small, fragile, of approximately 7 mm, subcircular and inaequivalve; left valve more convex than the right one. Anterior and posterior auricles unequal, umbonal angle about 90°. The left valve has concentric lamellae on the entire external surface. Near the umbonal top only small concentric lamellae, with wider interstices near the central part of the disc, and smaller near the ventral margin. The lamellae are spiny near the posterior side and ventral margin.
Small radial riblets between the concentric lamellae, which lack on the auricles. The auricles bear only concentric lamellae, which continue on the disc. The right valve is smoothly sculptured with concentric lamellae and microscopic interstitial radial striae. Near the ventral margin a miscroscopic fine granular interstitial structure can be observed (60 x ). The concentric lamellae on the anterior auricle are irregularly arranged, separated from the disc by a rising suture. The internal surface of the left valve is composed of fine radial grooves, and near the ventral margin crossed by some concentric grooves. The small hinge line is straight with an inclined rounded resilial insertion. The internal surface of the right valve is smooth, glossy and translucent with visible external concentric striae. The anterodorsal hinge line is spiny, caused by concentric external lamellae. Etymology. The new species is named after Arthur Bavay (1 840- 1923), a French pharmacist, who published with Dautzenberg (1912) on the Pectinacean Mollusca of the SIBOGA Expedition.
Distribution and ecology. The new species is so far only known from the type locality, and trawled from a blue muddy bottom.
Discussion. Another species with the same conchological characters of the left valve is Cyclopecten vidalensis Barnard, 1964, from off Zululand, South-Africa. This species has a finer sculpture with more concentric lamellae on the central part of the disc, and some rudimental internal lirae.»
HENK H. DIJKSTRA, 1990
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