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Wilbernia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Dikelocephalacea
Family:
Idahoiidae
Formal Genus Name and Reference:
Wilbernia WALCOTT, 1924
Type Species:
Ptychoparia pero WALCOTТ, 1890
Images
(Click to enlarge in a new window)
Fig. 189, 5a, b. W. explanata (Whitfield), Wis., 5a, ceph., 5b, pyg., both x1.5 (8). —Fig. 189, 5c, d. *W. pero (Walcotr), Tex., cran., x1.5 (321).
Synonyms
Geographic Distribution
N. Am.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Francon.)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
73.3
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian(Francon.)
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
87.5
Ending Date:
491.4
Description
Glabella elongate, tapering to subrectangular, lateral furrows faint to obsolete, eyes of medium size, somewhat behind center of glabella, frontal area broad (tr.), about 0.25 of length of cranidium, ratio of preglabellar field to border variable, anterior border furrow narrow, straight or curved, fixigenae slightly upsloping, with palpebral areas somewhat more than 0.3 of glabellar width, posterior area very narrow (exsag.), librigenae with long slender genal spine. Pygidium transverse, axis narrower than pleural field, 0.83 of length of pygidium, pleural furrows and interpleural grooves distinct, slightly curved, abutting against a narrow ridge in position of border furrow, border narrow, flat. Surface may be smooth
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Dikelocephalacea
Family:
Idahoiidae
Formal Genus Name and Reference:
Wilbernia WALCOTT, 1924
Type Species:
Ptychoparia pero WALCOTТ, 1890
Images
(Click to enlarge in a new window)
Fig. 189, 5a, b. W. explanata (Whitfield), Wis., 5a, ceph., 5b, pyg., both x1.5 (8). —Fig. 189, 5c, d. *W. pero (Walcotr), Tex., cran., x1.5 (321).
Synonyms
Geographic Distribution
N. Am.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Francon.)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
73.3
Beginning Date:
494.95
Ending Stage in Treatise Usage:
Upper Cambrian(Francon.)
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
87.5
Ending Date:
491.4
Description
Glabella elongate, tapering to subrectangular, lateral furrows faint to obsolete, eyes of medium size, somewhat behind center of glabella, frontal area broad (tr.), about 0.25 of length of cranidium, ratio of preglabellar field to border variable, anterior border furrow narrow, straight or curved, fixigenae slightly upsloping, with palpebral areas somewhat more than 0.3 of glabellar width, posterior area very narrow (exsag.), librigenae with long slender genal spine. Pygidium transverse, axis narrower than pleural field, 0.83 of length of pygidium, pleural furrows and interpleural grooves distinct, slightly curved, abutting against a narrow ridge in position of border furrow, border narrow, flat. Surface may be smooth