UPPER ORDOVICIAN BRACHIOPODS FROM KAZAKHSTAN 



67 



5mm 



i i i i i i 



-k^' 



1.2 









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, Parastrophina plena 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. 



l.figs 12-14. 



Parastrophina uniplicata Fu:130, pi. 36, fig. 17. 



HOLOTYPE. IGNA 436/1 86 1 , conjoined valves, from the Anderken 

 Formation, Sample 302 of Keller (1956), Anderkenyn-Akchoku 

 section. 



Material. 102 pairs of conjoined valves, 1 ventral and 2 dorsal 

 valves from Samples 100 (=K-98/1970), 8223a (BC 56595), 8223b 

 (BC 57248-52), 8226, Anderkenyn-Akchoku section; Samples 8214 

 (BC 57216-37, 57563), 8215 (BC 57238-47), west side of Ashchisu 

 River; Samples 628 (BC 56598-600), 2536 (BC 56605-10), 2538 

 (BC 57562), 8217, 8219, 8256 (BC 56603-4), Kujandysai Section; 

 Sample 948 (BC 57200-15), Tesik River. 



Table 24 



Measurements of ventral valves of Par 



astrophina plena 



Sapelnikov 



and Rukavishnikova, Sample 



948. Tesik river. 









L 



W 



T 



Ld 



Sw 



St LAV 



T/L 



LdAV 



SwAV 



N 



34 



34 



34 



34 



31 



33 34 



34 



34 



31 



X 



6.6 



7.1 



4.8 



6.7 



4.3 



3.1 93.6% 



72.7% 



94.3% 



60.7% 



s 



0.74 



0.95 



0.91 



0.75 



0.55 



0.82 5.7 



8.7 



5.5 



5.3 



MIN 



5.5 



5.8 



3 



5.5 



3.4 



1 .4 83.0% 



52.6% 



83.6% 



52.9% 



MAX 



9 



9.7 



7.5 



9 



5.4 



4.8 107.5% 



87.7% 



107.5% 



76.8% 



