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Irvingella

Classification

    Phylum:  
Unknown
    Class:  
Trilobata
    Order:  
Ptychopariida
    Superfamily:  
Komaspidacea
    Family:  
Komaspididea
    Formal Genus Name and Reference:  
Irvingella Ulrich & Resser in WALCOTT, 1924
    Type Species:  
I. major


Images

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Fossil Image
Fig. 218, 2. *I. major, Wis., 2a, b, cran. (with librigena), dorsal, profile, x1, 2 c, d, pyg., dorsal, profile, x3(48, 363)


Synonyms

lrvingellina, Parairvingella


Geographic Distribution

N. Am.-S. Am.-W.Eu.-Arct.Asia-E.Asia-C.Asia


Age Range

    Beginning Stage in Treatise Usage:  
Upper Cambrian(Francon, )
    Beginning International Stage:  
Paibian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
494.95
    Ending Stage in Treatise Usage:  
Upper Cambrian(Francon, )
    Ending International Stage:  
Jiangshanian
    Fraction Up In Ending Stage:  
0
    Ending Date:  
491.4


Description

Glabella convex, subquadrate, tapering, with 2 or 3 pairs of lateral furrows, posterior pair complete, preglabellar field narrow or absent, anterior border furrow faint or obsolete, eyes large, bowed, with point of flexure near center of glabella, fixigenae downsloping, with palpebral areas 0.5 or more of glabellar width, librigenae with eye platforms narrow anteriorly, wider posteriorly, genal spines of medium size. Pygidium subrectangular, with axis tapered nearly full length to rounded end, 2 axial rings and terminal, no pleurae, faint border furrow, rimlike border, commonly sinuous.




References



Museum or Author Information