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Calvinaria

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Rhynchonellida
    Superfamily:  
Camarotoechioidea
    Family:  
Leiorhynchidae
    Formal Genus Name and Reference:  
Calvinaria STAINBROOK, 1945, p. 43
    Type Species:  
Rhynchonella ambigua CALVIN, 1878, p. 729, OD


Images

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Fossil Image
Fig. 783, $1 a-j$. *C. ambigua (Calvin), upper Frasnian, Iowa, USA, $a-b$, hypotype, dorsal and posterior views, Amana Beds, Amana, x1.2$, c, holotype, ventral view, Independence Shale, Independence, $d$, hypotype, anterior view, Independence Shale, Brandon, x1$ (Stainbrook, 1945), $e-j$, serial sections 2.6, 2.7, $2.95, 3.3, 3.5, 3.8 \\mathrm{~mm}$ from posterior, x2$ (Sartenaer, 1955).


Synonyms



Geographic Distribution

North America, Europe, northern Africa, China


Age Range

    Beginning Stage in Treatise Usage:  
Upper Devonian (Frasnian)
    Beginning International Stage:  
Frasnian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
378.9
    Ending Stage in Treatise Usage:  
Upper Devonian (Frasnian)
    Ending International Stage:  
Frasnian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
371.1


Description

Large with markedly transversely ovate outline, Biconvex profile with lateral and anterior slopes low, Beak incurved, foramen oval, Fold and sulcus strong, arising at umbones, anterior commissure broadly uniplicate, tongue high, trapezoid, serrate, Costae broad, arising near umbones, present on fold, sulcus, and flanks, Dental plates convergent ventrally, often obscured by thick callus, ventral muscle field deeply impressed, Dorsal median septum long, thin, high, septalium short, narrow, hinge plates divided anterior of septalium, crura long, ventrally curved




References



Museum or Author Information

Stainbrook, 1945, Sartenaer, 1955