UPPER ORDOVICIAN BRACHIOPODS FROM KAZAKHSTAN 



33 



9 (5.0) 



5 10 mm 



_i i i i i i 



Fig. 11 Transverse serial sections of Teratelasmella chugaevae sp. nov. from Sample 100. Distance in mm is measured from the posterior tip of ventral 

 beak. Dorsal valve uppermost. Also lateral view to show section positions and schematic reconstruction. 



ribs and ornament becomes unequally parvicostellate, with up to 4 

 accentuated ribs and 9-15 parvicostellae per 3 mm along the anterior 

 margin. 



Ventral interior with delicate teeth and long, divergent dental 

 plates. Ventral muscle field subtriangular, open anteriorly. Dorsal 

 interior with bilobed cardinal process. Other characters of dorsal 

 interior unknown. 



Discussion. Within the Furcitellidae as revised by Cocks & Rong 

 (2000) these shells are comparable with Quondongia (Percival 

 1 99 1 : 1 5 1 ) and Molongcola (Percival 1 99 1 : 1 53) from the Caradoc of 



Australia in their planoconvex lateral shell profile and in the absence 

 of geniculation, but they differ from Molongcola in possessing 

 parvicostellate ornament. The absence of information on the dorsal 

 interior makes precise generic attribution impossible. 



Family GLYPTOMENIDAE Cooper, 1956 

 Genus GLYPTOMENA Cooper, 1956 



TYPE SPECIES. Glyptomena sculpturata Cooper, 1956. from the 

 Chatham Hill Formation (Llandeilo), Virginia, U.S.A. 



