Chlamydella Iredale, 1929
IREDALE, T. 1929b. Mollusca from the continental shelf of eastern Australia. No .2. Records of the Australian Museum, 17: 157-189, pls. 38-41. [p. 164]
«The minute shells, referred by Hedley to Cyclopecten, do not agree at all well with the type of the genus, differing in shape, sculpture, and hinge details, and must be classed in a new genus Chlamydella, the species favus being named as type.»
TOM IREDALE, 1929
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Cyclochlamys favus (Hedley, 1902) comb. nov.; H. H. Dijkstra, 1995, Bathyal Pectinoidea (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae) from New Caledonia and adjacent areas, figures 87-90.
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Chlamydella favus (Hedley); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of Australia and adjacent waters, figures 21C, 21F-21L.
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«Chlamydella Iredale, 1929
Chlamydella Iredale, 1929: 164, 188. Type species (by original designation): Cyclopecten favus Hedley, 1902; Recent, off New South Wales, Australia, 75–91 m.
Diagnosis. Shell inequivalve, minute, up to c. 3 mm high, circular to posteriorly oblique; prodissoconch weakly inflated; left valve sculptured with radial and/or commarginal riblets or striae or smooth, right valve with commarginally elongate hexagonal (honeycomb-like) microstructure (simple calcitic prismatic outer layer); auricles unequal; byssal notch well-developed; no ctenolium; no internal lirae.
Distribution. Pleistocene–Recent. Australia, New Zealand, Japan, sublittoral to bathyal. Cyclopecten (Chlamydella) sp. from the early Miocene (Aquitanian) Bhuban Formation, NE India (Mazumder & Tiwari 2012: 31, pl. 1, fig. 8) is based on an unidentifiable mould. This is the only published fossil record we are aware of, although D. Jablonski (pers. comm. 27 Jun 2017) reported an unpublished Pleistocene record from Henderson Island.
Discussion. Hayami & Kase (1993: 61) enumerated representative species of Chlamydella from Australia, subantarctic seas and Japan. They also suggested that Cyclochlamys might be a senior synonym of Chlamydella. Although they placed both newly described species, i.e. Chlamydella incubata Hayami & Kase, 1993 and Chlamydella tenuissima Hayami & Kase, 1993 in the present genus, the figured prodissoconchs of the two species differ strongly (Hayami & Kase, 1993, fig. 204, lv prodissoconch of C. incubata conical, typical of Cyclochlamys; figs 215–216, lv prodissoconch of C. tenuissima weakly inflated, typical of Chlamydella). Dijkstra & Marshall (2008: 22) synonymized the two genera, but Dijkstra & Maestrati (2012: 394) differentiated them, based mainly on their distinct prodissoconchs, and placed both genera in family Cyclochlamydidae.»
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. 158, 159]
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