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Vagrania

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Atrypida
    Superfamily:  
Palaferelloidea
    Family:  
Karpinskiidae
    Formal Genus Name and Reference:  
Vagrania Alekseeva, 1959, p. 389, Totia Rzhonsnitskaia & MIZENS, 1977, p. 20
    Type Species:  
Atrypa kolymensis NALIVKIN, 1936, p. 17, OD


Images

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Fossil Image
Fig. 986, 1a-e. *V. kolymensis (Nalivkin), upper Emsian, ?lower Eifelian, Kolyma, northeastern Siberia, $a-d$, dorsal, ventral, anterior, lateral views, x1, e$, serial section, x2$ (Rzhonsnitskaia & Mizens, 1977).


Synonyms



Geographic Distribution

Europe, Urals, arctic Canada, southern China


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:  
Middle Devonian (Eifelian)
    Ending International Stage:  
Eifelian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
385.3


Description

Small to medium, rounded, biconvex, prominent apsacline-orthocline area, apical foramen, ribs medium to coarse, consistently spaced, bifurcating ventrally, intercalating dorsally, rectimarginate to weakly plicate commissure, large deltidial plates fused into collar, teeth with prominent dental cavities, strong ventral vascular ridges, hinge plate thick, crural bases, crura delicate, spiralia dorsomedial, fewer than 20 whorls, jugal processes terminating in jugal plates curving away from each other. [Distinguished from Mimatrypa by its convexity, bifurcating and intercalating coarser ribs, dental cavities; differs from Desatrypa by having dental cavities (dental plates), coarser ribs. Totia has been distinguished from Vagrania by its somewhat finer ribs and the presence of microornamental tubercles, but these characters appear to be variable.]




References



Museum or Author Information

Rzhonsnitskaia & Mizens, 1977