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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
(Click to enlarge in a new window)
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
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
(Click to enlarge in a new window)
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.