. Bulletin of the Natural Histort Museum. Geology series. 0 5mm i i i i i i -k^' 0 I L 5 mm j i i Fig. 16 Transverse serial sections from Sample 948, Tesik River. A, Parastrophina iliana sp. nov., BC 57560; B, Parastrophinaplena Sapelnikov & Rukavishnikova, BC 57564. Distance in mm is measured from the posterior tip of ventral beak. Dorsal valve uppermost. variable in the studied samples. There is also a strong tendency to asymmetry in the anterior commissure of the Kazakh shells. How- ever, as mentioned by Cooper, his specimens were somewhat different from Hall's types and the specie
. Bulletin of the Natural Histort Museum. Geology series. 0 5mm i i i i i i -k^' 0 I L 5 mm j i i Fig. 16 Transverse serial sections from Sample 948, Tesik River. A, Parastrophina iliana sp. nov., BC 57560; B, Parastrophinaplena Sapelnikov & Rukavishnikova, BC 57564. Distance in mm is measured from the posterior tip of ventral beak. Dorsal valve uppermost. variable in the studied samples. There is also a strong tendency to asymmetry in the anterior commissure of the Kazakh shells. How- ever, as mentioned by Cooper, his specimens were somewhat different from Hall's types and the species needs more substantial revision. Specimens from the Anderken Formation described by Rukavishnikova (1956) as Camerella haemiplicata (Hall) var. ro- tunda seem likely to represent a mixture of several taxa. In particular, the specimens illustrated on her pi. 2, fig. 2 may belong to Liostrophia, but others appear to be conspecific with ours. It is possible that the Kazakh shells are conspecific with the specimens described as Parastrophina haemiplicata by Fu (1982: 129, pi. 36, fig. 16) from the Jinhe Formation (Caradoc) of northwest China. The only illustrated specimen is similar to some of the juvenile Kazakh shells in ribbing and in the lateral profile of both valves, but it is impossible to estimate the limits of morphological variation in the Chinese population of Parastrophina from the published illustrations and description. There is remarkable general similarity between the brachiopod assemblage from the Jinhe Formation and the fauna from the carbonate mud-mounds in the upper Anderken Formation. In particular, both assemblages contain distinctive genera such as Schizostrophina and Pectenospira (Popov et al. otherwise unknown elsewhere. 1999) which are Parastrophina plena Sapelnikov & Rukavishnikova, 1975 PI. 13, figs 51-58; Figs 15, 16 1975 1982 Parastrophina plena Sapelnikov & Rukavishnikova: 27, pi. 12-14. Parastrophina uniplicata Fu:130, pi. 36, fig. 1
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