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Nudispiriferina

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Spiriferinida
    Superfamily:  
Pennospiriferinoidea
    Family:  
Balatonospiridae
    Formal Genus Name and Reference:  
Nudispiriferina Yang & XU, 1966, p. 47
    Type Species:  
N. minima, OD


Images

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Fossil Image
Fig. 1281, 4a-k. *N. minima, Guizhou, a-e, dorsal, ventral, lateral, posterior, and anterior views, f, enlarged dorsal view, X4, g-k, transverse sections, approximately X2 (Yang & Xu, 1966).


Synonyms



Geographic Distribution

southwestern China


Age Range

    Beginning Stage in Treatise Usage:  
Middle Triassic
    Beginning International Stage:  
Anisian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
246.7
    Ending Stage in Treatise Usage:  
Middle Triassic
    Ending International Stage:  
Ladinian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
237


Description

Strongly inequivalved with high, strongly convex ventral and weakly convex dorsal valves, cardinal extremities angular, ventral beak incurved, fold and sulcus poorly delineated, rounded, smooth, lateral slopes with few rounded plicae, microornament absent, dental adminicula and spondylium absent, dental flanges and median septum connected by very short, transverse callus or plate, cardinal process nonstriate, knoblike, sessile, jugum unknown.




References



Museum or Author Information

Yang & Xu, 1966