Laevichlamys mollita (Reeve, 1853)
REEVE, L. A. 1852-1853. Monograph of the genus Pecten. In: Conchologia Iconica: or illustrations of the shells of molluscous animals, vol. 8. London [unnumbered pages], pls. 1-35. [sp. 100, pl. 25, sp. 100]
1853 Pecten mollitus Reeve, 1853
L. A. Reeve, 1852-1853, plate 25
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«PECTEN MOLLITUS. Pect. testâ suborbiculari, paululum altiore quam longâ, compressâ, tenui, semipellucidâ, aequilaterali, aequivalvi, radiatim undique densè subtilissimè serrato-siriatâ; albidâ aut lutescente, pellucido-roseo concentricè tinctâ, punctis numerosis fuscescentibus aspersâ; auriculis peculiariter inaequalibus.
THE DELICATE PECTEN. Shell nearly orbicular, a little higher than long, compressed, thin, semitransparent, equilateral, equivalve, radiately densely very finely serrately striated throughout; whitish or yellowish, concentrically stained with transparent rose, and sprinkled throughout with light brownish dots; ears peculiarly unequal.
Hab. Japan. This, as will be seen by the above description, is an extremely characteristic species; delicate in its substance, sculpture, and colouring, and quite distinct from any hitherto known.» LOVELL AUGUSTUS REEVE, 1853
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«Type data. — Two syntypes (pv) BMNH 1995081. Type locality: Japan.
Remarks. — The largest specimen in the type lot does not belong to the type series. Reeve (1853) described Pecten mollita from Japan. However, the type lot has three labels, on two of which is written "Celebes" (Sulawesi, Indonesia). This again suggests confusion by Cuming over the true locality for these shells. The smallest syntype of L. mollita was refigured by Higo et al. (2001: 156, fig. B438). Material examined. — Philippines: PMBP 2004, Stn B2, 5 m, 1 pv (A); Stn B15, 2-4 m, 2 pv (A); Stn B16, 20 m, 3 pv (A); Stn B38, 17-18 m, 1 v; Stn B39, 17-25 m, 1 pv (A); Stn P4, 80-120 m, 1 v; Stn R19, 2-54 m, 2 pv (A); Stn R25, 2-32 m, 1 pv (A); Stn R34, 1-12 m, 1 pv (A); Stn R54, 8-10 m, 1 pv (A); Stn S1, 5 m, 1 v; Stn S8, 28-32 m, 1 pv (A), 5 v; Stn S21, 4-12 m, 3 v; Stn S28, 28-32 m, 1 pv (A), 4 v.
Description. — Shell thin, up to c. 50 mm high, circular, weakly inflated, almost equally inflated, somewhat inequivalve, equilateral, auricles unequal in shape and size, umbonal angle c. 100˚; colour highly variable, yellow, orange, red, pink, purple or brown, mottled, with c. 8 paler radial streaks. Both valves sculptured with numerous, evenly spaced, weak, delicate, squamous, round-crested radial riblets (c. 10 per cm in adult stage near ventral margin). Antimarginal microsculpture in radial interspaces in early radial stage and on posterolateral area of disc. Anterior auricles much larger than posterior ones, with squamous radial riblets (c. 12 on lv, 6-8 on rv); c. 4-6 weaker riblets on posterior auricles. Byssal notch relatively deep, byssal fasciole broad. Functional ctenolium welldeveloped, with 6-9 teeth.
Distribution. — Indo-West Pacific, from southern Japan, Philippine Islands, Malaysia, Indonesia, Papua New Guinea, Solomon Islands to northeastern Australia (Raines & Poppe, 2006: 204). Present specimens from the Philippines alive at 4-28 m (minimum depth range). Living byssally attached under coral boulders or amongst coral rubble on sandy bottoms. Remarks. — The present specimens of L. mollita from the Philippines are indistinguishable from the type material. Juveniles could easily be confused with other small specimens of congeneric multiradial species such as L. cuneata and L. squamosa.» DIJKSTRA, H. H.. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32 pls, 2 tabs. [p. 68]
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Laevichlamys mollita (Reeve, 1853); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, plate 18, figures 2a-2d; plate 20, figures 3a, 3b (juvenile).
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«Remarks: - This species can be distinguished from Chlamys irregularis (Sowerby) by its numerous, close-set, finely scaled, fine radial ribs which usually remain undivided and finely scaled intercalary threads.
The present record may be the first from the Cenozoic formations of Japan. Type locality: - Japan, Recent. Distribution: - Shirahama formation, Shizuoka Prefecture; Living in the Pacific (31-35°N.) and Japan Sea (-41°N.): Early Pliocene to Recent Occurrence: - Few in the calcareous coarse-grained sandstone of the Shirahama formation.» MASUDA, K. 1962. Tertiary Pectinidae of Japan. Science Reports of the Tohoku University [2nd. Series - Geology], 33 (2): 117-238, pls. 18-27. [p. 179]
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Chlamys mollita (Reeve); K. Masuda, 1962, Tertiary Pectinidae of Japan, plate 23, figures 6-8.
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