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Skenidium

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Protorthida
    Superfamily:  
Skenidioidea
    Family:  
Skenidiidae
    Formal Genus Name and Reference:  
Skenidium HALL, 1860a, p. 70
    Type Species:  
Orthis insignis Hall, 1859a, p. 173, SD Hall & CLARKE, 1892, p. 241


Images

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Fossil Image
Fig. 515, 1a-d. *S. insignis (Hall), Lochkovian, Albany, $a$, dorsal interior, x6}$, b, ventral interior, x6}$, c, posterior view of conjoined valves, $\\boldsymbol{X} 6, d$, dorsal exterior, x6$ (Schuchert & Cooper, 1932).


Synonyms



Geographic Distribution

cosmopolitan


Age Range

    Beginning Stage in Treatise Usage:  
Lower Devonian (Lochkovian),
    Beginning International Stage:  
Lochkovian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
419
    Ending Stage in Treatise Usage:  
Upper Devonian (Frasnian)
    Ending International Stage:  
Frasnian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
371.1


Description

Coarsely costate to dichotomously costellate, ventral interarea usually procline, dorsal interarea vestigial, fulcral plates very wide, flat to concave, defining elongate sockets restricted to concave zones adjacent to hinge line, cardinal process ridgelike, apparently formed of upturned posteromedial edges of brachiophore plates, not continuous with dorsal median septum




References



Museum or Author Information

Schuchert & Cooper, 1932