Parvamussium koslovi (Zhizhchenko, 1953)
ZHIZHCHENKO, B. P. 1953. Pectinidae miotsena Chernovitskogo rayona. Trudy VNIIGAZ: 225-242. Gostoptekhizdat, Moscow (in Russian). [p. 238, pl. 2, figs. 1, 2]
1953 Amussium [sic] koslovi Zhizhchenko, 1953
«Zhizhchenko (1953, p. 238, 239) erected the species koslovi on the basis of Middle Miocene material derived from the Lower Badenian deposits in the Bilche–Volytsia Zone of the Carpathian Foredeep Basin in Ukraine. According to the original description, Amussium (Variamussium) koslovi shares many features in common with P. bronni. The two species have the left valve ornamented with numerous commarginal lamellae and both have the same number of internal ribs. For an unknown reason Zhizhchenko de signed as a holotype a right valve of which the external character was not known to him (Zhizhchenko, 1953, pl. 2, fig. 1). The original figure of koslovi (Zhizhchenko, 1953, pl. 2, figs. 1, 2) suggests that it may be more appropriately attributed to P. duodecimlamellatum, with which it shares the same shape and number of internal ribs (Deperet and Roman, 1928, pl. 27, fig. 6a, b; Kojumdgieva, 1960, pl. 25, fig. 9b; Hertlein, 1969, N350, fig. C73. 2a, b).
Unfortunately, the type specimens of koslovi have not been found and the character of the external right valve is not known, and thus the validity of this species must remain uncertain. No material apart from that described by Zhizhchenko is known. Thus, a re-study of the type (apparently lost) or more material is needed for a better founded interpretation of this taxon. At present Parvamussium koslovi is considered as a nomen nudum. It may possibly represent a distinct species, but could also be regarded as conspecific with P. bronni or P. duodecimlamellatum.» STUDENCKA, B., V. A. PRYSYAZHNYUK & S.A. LJUL’EVA. 2012. First record of the bivalve species Parvamussium fenestratum (Forbes, 1844) from the Middel Miocene of the Paratethys. Geological Quarterly, 56 (3): 513-528, figs. 1-5. [p. 524]
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