Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889)
BUCQUOY, E., P. DAUTZEMBERG & G. DOLLFUS. 1889. Les mollusques marins du Rousillon. Tome II. Pélécypodes. Avec Atlas de 99 planches en phototypie. Paris [p. 88, pl. 20, fig. 3]
1889 Pecten glaber var. pontica Bucquoy, Dautzenberg & Dollfus, 1889
E. Bucquoy, P. Dautzenberg & G. Dollfus, 1889, plate 20.
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«Var ex forma D, pontica B. D. D. = unicolor Sowerby, Reeve (non Lamarck). Chez cette variété, nettement inéquivalve, que nous avons représentée pl. XX, fig. 3, la valve droite est presque tout à fait plane, tandis que la gauche est bien convexe et sa forme est souvent assez irrégulière et un peu oblique. La coloration semble plus constante que celle des var. distans et sulcata: nous n'en connaissons, en effet, que des spécimens monochromes et nous ne pensons pas qu'elle présente jamais la coloration bigarrée.
Nous n'avons pu conserver le nom unicolor sous lequel Sowerby et Reeve ont parfaitement décrit et figuré la présente variété, car il existait déjà un P. unicolor Lamarck que nous considérons comme identique au P. glaber de Linné. C'est donc à tort que M. Locard a fait figurer dans la synonymie du P. unicolor Lk les références de Sowerby et de Reeve qui se rapportent à une forme très différente.» MARIE EDME JULES BUCQUOY, PHILIPPE DAUTZENBERG & GUSTAVE FRÉDÉRIC DOLLFUS, 1889
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«Concept of the specific morphological features of the F. ponticus in comparison with those of the parent F. glaber was based on some exaggeration of the differences and partly on incompleteness and inaccurate interpretation of the data. Our research completes the comprehension of the variability of morphological features and allows to make more precise interpretation of the available information. Analysis of the Smooth Scallop shell morphology, based on comparison of own and published data, gives the basis for confirmation the identity of F. ponticus to the parent F. glaber.
A subspecies formation happens in conditions of sufficiently long-time geographical isolation. The Black Sea is relatively isolated from the other seas of the Mediterranean region, that allowed the most euryhaline fauna to colonize and spread in the Black Sea with increasing salinity to a level close to the Recent one. The Kalamitian period, when the introduction of F. glaber started, dates back to 7,000 years ago and the Smooth Scallop population development covered the Dzhemetin stage which began less than 3,000 years ago [1]. Obviously, this time interval is not sufficient for subspecies’ generation in the Black Sea that is confirmed by the absence of any other recognized endemic bivalve mollusk subspecies there. Actually, Late Quaternary (Q4) Black Sea F. glaber specimens do not have any significant morphological differences as compared with Recent ones (Table 1). Thus, one of the most variable Pectinidae – F. glaber – did not have any natural historical conditions for a subspecies generation in the Black Sea. Conclusion. The shell morphology data of the Smooth Scallop shows no distinct differences between populations from the Black Sea and Mediterranean basin. Morphological and brief life history analyses gives basis for confirming the identity of F. ponticus to the parent F. glaber. Thus, F. glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) has to be accepted as a synonym of Flexopecten glaber (L., 1758).»
[1] Bondarev I. P. Main features and stages of the Black Sea ecosystem formation in the Late Pleistocene-Holocene. Geologiya i poleznye iskopaemye Mirovogo okeana, 2012, no. 2 (28), pp. 53–71. (in Russ.).
BONDAREV, I. P. 2018. Taxonomic status of Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) – the Black Sea Flexopecten glaber (Linnaeus, 1758) (Bivalvia: Pectinidae). Marine Biological Journal, 3 (4): 29-35, figs. 1, 2. [p. 33, 34]
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F. glaber; I. P. Bondarev, 2018, Taxonomic status of Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) – the Black Sea Flexopecten glaber (Linnaeus, 1758) (Bivalvia: Pectinidae), figure 2.
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