Volachlamys sinomarina (Hertlein, 1936)
HERTLEIN, L. G. 1936. Three new sections and rectifications of some specific names in the Pectinidae (I). The Nautilus, 50 (1): 24-27. [p.27]
Chlamys ambiguus Bavay; A. Bavay, 1904, Description de quelques nouvelles espèces du genre Pecten, plate 6, figures 15, 16.
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«PECTEN SINOMARINUS, new name
Pecten ambiguus Bavay, Journ. de Conchyl., Vol. 52, no. 3, October, 1904, p. 198, pl. 6, figs. 15 and 16. "mare sinense boreale." Recent. Not Pecten ambiguus Münster, in Goldfuss, Petref. Germaniae, Th. 2 (4), 1833, p. 46, Tab. 90, figs. 5a, b. "Findet sich im unteren Oolith bei Gräfenberg im Baireuthischen." [Jurassic] ; not p. 64, Tab. 96, figs. 2a, b, c. "bei Bünde." [Oligocene.] The specific name ambiguus was applied to a species of Pecten from Jurassic beds, and on another page to an Oligocene species in Germany by Miinster whose use of the name is much earlier than that of Bavay. Münster's species is usually classified under the subgenus Chlamys and in that case Bavay's use of ambiguus is untenable. The name sinomarinus is here proposed for the Chinese species. As indicated by Bavay, the species appears to belong to the group which includes Pecten hirasei Bavay, P. singaporinus Sowerby and P. tranquebaricus Gmelin.» LEO GEORGE HERTLEIN, 1936
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«Regarding the form name of the awajichihiro form, Hayami's view that Chlamys ambiguus is an identical species to Volachlamys hirasei, which was the basis for the form name, is doubtful. According to the description of Chlamys ambiguus (the specific name was rewritten as ambigua in Hayami [1985] and Bernard et al. [1993], because the genus name of Chlamys is female gender), width of the radial costae is rather wide and its number is 13, visually underscoring the difference from V. hirasei (awajichihiro form) from the Seto Inland Sea examined in the present analytical studies. The radial costae numbers of nearly 1000 individuals from the Seto Inland Sea are 13-21, and individuals with 13 costae occupy only 0.6% of the whole (see Chapter 2). Thus, if species are defined with the difference in the radial costae number, C. ambigua may be a distinct species from V. hirasei.
The definitions by Hayami (1985) are followed by Okutani et al. (1989), who described "Volachlamys hirasei (awajichihiro form)" from the Yellow Sea. The described specimen is probably from the identical population (species?) of C. ambigua. In their description, the radial costae number of the illustrated specimen is 13, which is equivalent to that of the type specimen of C. ambigua (Bavay, 1904). While Zhongyan (2004) described "Volachlamys hirasei (awajichihiro form)" from China, the radial costae number of the illustrated specimen also is 13. Although there can be a certain variation range in the radial costae number, such information suggests that mode of the radial costae number of C. ambigua is located around 13, significantly differing from V. hirasei in the specific level. Regarding the marine life populating the China coast, many species are common to those species that inhabit Japan. However, for such species as the top shell, Turbo (Batillus) cornutus (Ozawa and Tomida, 1995), the red ark shell, Scapharca broughtonii (Yokogawa, 1997), and the sea bass, Lateolabrax japonicus (Yokogawa and Seki, 1995), morphological or genetic analysis revealed that the Chinese species actually was a distinct species from the Japanese one. Those reports suggest necessity of careful examination for Chinese "Volachlamys hirasei" (Chlamys ambigua). Regarding the above-discussed reason, the basis to use var. ambigua as the form name of the awajichihiro form is now doubtful; moreover, there even is a view to regard Chlamys ambigua by Bavay (1904) as a valid species (Bernard et al., 1993). Consequently, this form name is inappropriate. Instead, a new name of the awajichihiro form should be proposed, that is Volachlamys hirasei var. awajiensis after Pecten awajiensis, which is the species name described by Pilsbry (1905), based on the type specimen of the awajichihiro form from the Seto Inland Sea». YOKOGAWA, K. 2005. Biological characteristics and phylogeny of the genus Volachlamys (Bivalvia: Pectinidae) from Japan. Ph. D. thesis submitted to Kochi University in August, 2005. [p. 48, 49]
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