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Pterocephalia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Dikelocephalacea
Family:
Pterocephaliidae
Formal Genus Name and Reference:
Pterocephalia F. Roemer, 1852
Type Species:
P. sanctisabae
Images
(Click to enlarge in a new window)
Fig. 192, 1. *P. sanctisabae, Tex., 1 a, b, ceph., pyg., x1.3 (15).
Synonyms
Pterocephalus
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 tapering to truncate-tapering, eye ridges distinct, frontal area 0.5 or more of length (sag.) of cranidium, with concave preglabellar field and border, anterior border furrow obsolete, eyes of medium size, somewhat posterior to center of glabella, fixigenae upsloping, with palpebral areas about 0.5 of glabellar width, posterior areas narrow, straplike, long (tr.), librigenae with very broad concave border but no marginal furrow, bearing broad-based medium-length genal spine. Pygidium broadly semicircular, axis narrower than pleural fields, tapered 0.5 to 0.7 of its length, with 7 to 10 axial rings and terminal, pleurae 4 to 7 , pleural furrows broad, shallow, curving backward onto broad concave border, short narrow interpleural groove may appear just behind the posterior edge of several pleurae. Surface finely granulose.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Dikelocephalacea
Family:
Pterocephaliidae
Formal Genus Name and Reference:
Pterocephalia F. Roemer, 1852
Type Species:
P. sanctisabae
Images
(Click to enlarge in a new window)
Fig. 192, 1. *P. sanctisabae, Tex., 1 a, b, ceph., pyg., x1.3 (15).
Synonyms
Pterocephalus
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 tapering to truncate-tapering, eye ridges distinct, frontal area 0.5 or more of length (sag.) of cranidium, with concave preglabellar field and border, anterior border furrow obsolete, eyes of medium size, somewhat posterior to center of glabella, fixigenae upsloping, with palpebral areas about 0.5 of glabellar width, posterior areas narrow, straplike, long (tr.), librigenae with very broad concave border but no marginal furrow, bearing broad-based medium-length genal spine. Pygidium broadly semicircular, axis narrower than pleural fields, tapered 0.5 to 0.7 of its length, with 7 to 10 axial rings and terminal, pleurae 4 to 7 , pleural furrows broad, shallow, curving backward onto broad concave border, short narrow interpleural groove may appear just behind the posterior edge of several pleurae. Surface finely granulose.