Ciclopecten Seguenza 1877
SEGUENZA, G. (1877) Studii stratigrafici sulla formazione pliocenica dell’Italia Meridionale (continuazione). Bollettino del Reale Comitato Geologico d’Italia, 8 (5, 6): 359-367. [p. 362]
«GEN. Ciclopecten n. g.
La conchiglia in forma di Pecten manca di costole radianti interne ed esterne ed invece offre delle pieghe incurvate, concentriche, parallele al margine.»
GIUSEPPE SEGUENZA, 1877
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Ciclopecten fluctuatus (Bavay, 1905); H. H. Dijkstra & B. A. Marshall, 2008, The recent Pectinoidea of the New Zealand region, figures 40C, 40 G
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«Genus Ciclopecten G. Seguenza, 1877
Ciclopecten G. Seguenza, 1877: 362. Type species (by original designation): Ciclopecten peloritanus G. Seguenza, 1877; Pliocene, Italy.
Diagnosis
Pectinidae with commarginally undulated, weakly inflated valves; fragile, slightly oblong, prominent radial and weak commarginal sculpture, radial microsculpture throughout; byssal notch moderately deep, byssal fasciole distinct, functional ctenolium present. Distribution
Pliocene (Italy) to Recent (bathyal tropical Indo-West Pacific). Remarks
The phylogenetic relationship between Ciclopecten, Hyalopecten and Delectopecten Stewart, 1930 is not well understood and Ciclopecten is here provisionally placed between Hyalopecten and Delectopecten, based on such similarities as undulated shell surface similar to that in Hyalopecten, shape and radial microsculpture similar to that in Delectopecten, and a reticulate macrosculpture similar to that in both genera. Byssal notch and functional ctenolium are well-developed in all three genera.» DIJKSTRA, H. H. & B. A. MARSHALL. 2008. The recent Pectinoidea of the New Zealand region (Mollusca: Bivalvia: Propeamusiidae,Pectinidae and Spondylidae). Molluscan Research, 28 (1): 1-88, figs. 1-70. [p. 47]
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