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Trigonospirifer

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Spiriferida
    Superfamily:  
Delthyriodoidea
    Family:  
Hysterolitidae
    Formal Genus Name and Reference:  
Trigonospirifer Wang, Rong, & CHEN, 1987, p. 132
    Type Species:  
Subcuspidella trigonata Hou & XIAN, 1975, p. 68, OD


Images

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Fossil Image
Fig. 1217, 1 a-d .* T. trigonata (Hou & XiAN), ventral, dorsal, anterior, and side views, X1 (new).


Synonyms



Geographic Distribution

China (central Guangxi)


Age Range

    Beginning Stage in Treatise Usage:  
Lower Devonian (upper Emsian)
    Beginning International Stage:  
Emsian
    Fraction Up In Beginning Stage:  
66
    Beginning Date:  
399.81
    Ending Stage in Treatise Usage:  
Lower Devonian (upper Emsian)
    Ending International Stage:  
Emsian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
394.3


Description

Large, biconvex, transverse, with acute cardinal angles, ventral interarea moderately high, steeply apsacline, with apical deltidium, fold and sulcus prominent, smooth, rounded, flanks with few strong, rounded plications and U-shaped interspaces, concentric lamellae widely to closely spaced, dental plates thick, with umbonal callus, crural plates lacking. Lower Devonian (upper Emsian): China (central Guangxi).




References



Museum or Author Information

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