Cyclochlamys Finlay, 1926
FINLAY, H. J. 1926. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute, 57: 320-485, pls. 18-23. [p. 452]
«Pecten transenna Suter has a peculiar facies quite different from that of true Cyclopecten; it is rhomboidal, the ears are not marked on the right valve and only slightly on the left, and both valves have the same sculpture of strong, rather distant nodulous ribs, while the texture of the shell differs from that of Cyclopecten, being similar to that of a young Chlamys. I supply for it the new generic name Cyclochlamys, and mention as a second member a shell described and well figured by Miss Mestayer (Trans. N.Z. Inst., vol. 51, p. 135, 1919), but misidentified by her as Suter's species; it, differs frolptransenna in its much larger size, and in'having about twice' as many ribs. I propose for it the name Cyclochlamys secundus n. sp. Suter,'s drawing of transenna gives the appearance of his species quite well, and his specimens were adult, numerous topotypes I have examined not reaching any larger size.»
HAROLD JOHN FINLAY, 1926
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Cyclochlamys transenna (Suter, 1913); H. H. Dijkstra & B. A. Marshall, 2008, The recent Pectinoidea of the New Zealand region, figures 29A–29E, 29G–29I.
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Cyclochlamys nepeanensis (Pritchard & Gatliff); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 23C, 23F, 23H–23J.
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«Cyclochlamys Finlay, 1926
Cyclochlamys Finlay, 1926: 452. Type species (by original designation): Pecten transenna [sic] Suter, 1913; Recent, near the Snares Islands, New Zealand, 91 m; widespread around New Zealand.
Diagnosis. Shell inequivalve, minute, circular to posteriorly oblique; protruding conical to triangular prodissoconch on left valve, almost flat on right valve; 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. Oligocene?; lower Miocene–Recent (Cotton, 1961: 104; Pastorino & Griffin, 2018: 2). Australia, New Zealand, subantarctic, Japan, 73–274 m. A species referred previously to Cyclopecten from the latest Eocene or earliest Oligocene (early Whaingaroan New Zealand Stage) Ototara Limestone in North Otago, New Zealand (Robinson & Lee, 2011, p. 138, fig. 3D–H) has a characteristic outer layer of elongate hexagonal calcite prisms on the right valve and is referred to Cyclochlamys, although it also has weak commarginal ridges and possibly belongs in Chlamydella.
Discussion. Cyclochlamys Finlay, 1926 was erroneously mentioned as a “nom. null.” by Hertlein (1969: N353), but is an available name, and is distinguishable from Cyclopecten Verrill by its pteriiform shell, its tall, conical prodissoconch on the left valve, and the commarginally elongate hexagonal (honeycomb-like) microsculpture of the right valve. The genus is known from New Zealand, southern Australia, the subantarctic region (Hayami & Kase, 1993), southern Japan (Hayami & Kase, 1993: 61), the Southwest Pacific (Dijkstra & Maestrati, 2012: 394), and southern Argentina (Pastorino & Griffin, 2018).»
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]
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