Scaeochlamys Iredale, 1929
IREDALE, T. 1929. Mollusca from the continental shelf of eastern Australia. No .2. Records of the Australian Museum, 17: 157-189. [p. 162]
«Four very distinct series are at once noted, the asperrimus, lividus, bifrons and "hedleyi" groups, and it will clarify matters to designate these groups as genera, so I herewith propose Mlimachlamys "with P. asperrimus as type, Scaeochlamys with Pecten lividus as type, Equichlamys with P. bifrons as type and Mesopeplum with M. caroli as type.
(...)
In Scaeochlamys a somewhat different growth sequence can be traced the auricles being more unequal, but otherwise the immature is similar to that of the preceding. The sculpture begins with plain radials, ten to twelve on the left valve but twenty to thirty on the right valve. The interstices between the riblets are threaded radially with irregular scratches, but this interradial sculpture develops into the well-known "Camptonectes" form and then vanishes. On the valves the original ribbing develops in strength, but remains constant in number, scales appearing according to situation, and growing more strongly on the left valve, thus producing a dissimilar effect in the mature stage. The valves also become distorted with age, while the hinge area is more pronounced.»
TOM IREDALE, 1929
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Pecten lividus Lamarck; L. A Reeve, 1852-1853, Monograph of the genus Pecten. In: L. A. Reeve (Ed.), 1843-1878, Conchologia Iconica; or illustrations of the shells of molluscous animals, volume 8, plate 19, figure 71.
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Scaeochlamys livida (Lamarck); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of Australia and adjacent waters, figures 76B, 76E, 76G, 76I.
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«Scaeochlamys Iredale, 1929: 162. Type species (by original designation): Pecten lividus Lamarck, 1819; Recent, southwestern, southern and southeastern Australia.
Diagnosis. Pedini attached by byssus, prosocline or prosogyrate in form, right valve flattened (distorted in most specimens), left valve convex; macrosculpture of unevenly spaced, strongly scaly, primary radial plicae and secondary interstitial riblets at least in early ontogeny; prominent interstitial shagreen microsculpture on anterior auricle of left valve and on disc at least in early ontogeny; byssal notch deep, ctenolium well-developed. Hinge with prominent resilial and dorsal teeth. Interior weakly plicate.
Distribution. Pleistocene [e.g., Japan (Masuda, 1962), Red Sea (Cox, 1929)]–Recent. (Sub)tropical Indo-West Pacific to temperate waters of the NW and SW Pacific, living in the intertidal to sublittoral zones, byssally attached to rocks, gravel or other hard substrates.
Discussion. Hertlein (1969: N355) treated Scaeochlamys as a junior synonym of Chlamys Röding, 1798, placed in the suprageneric Chlamys group. Vaught (1989: 118) followed Hertlein. Waller (1993: 203) recognized Scaeochlamys as a genus in Chlamydini (i.e., Pedini).»
DIJKSTRA, H. H. & A. G. BEU. 2018. Living scallops of Australia and adjacent waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae). Records of the Australian Museum, 70 (2): 113-330, figs. 1-102. [p. 255]
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