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Ptychaspis
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychaspidacea
Family:
Ptychaspididae
Formal Genus Name and Reference:
Ptychaspis Hall, 1863
Type Species:
Dikelocephalus miniscaensis Owen, 1852, SD MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. 237, 5a-e. * P. miniscaensis (Owen), Wis., 5a, b, cran., 5c, librigena, 5d, e, pyg., all x0.7 (53)., Fig. 237, 5f-j. P. granulosa (Owen), Wis., 5f, g, cran., x1.2, x1, 5 h, librigena, x1, 5 i, j, pyg., x1(8, 53).
Synonyms
Asioptychaspis, Fengshania
Geographic Distribution
N.Am.E.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 subrectangular to subquadrate, front rounded, anterior lobe commonly swollen, anterior border furrow obsolete, eyes opposite or in front of mid-length of glabella, fixigenae upsloping, with palpebral areas slightly more than 0.3 of glabellar width, posterior areas stout, of medium length (tr.). Pygidium with all furrows distinct, 4 or 5 axial rings, 4 or 5 pleurae, border flat. Surface granulose, irregular ridges invariably on border of cephalon and in some also on genae and glabella.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychaspidacea
Family:
Ptychaspididae
Formal Genus Name and Reference:
Ptychaspis Hall, 1863
Type Species:
Dikelocephalus miniscaensis Owen, 1852, SD MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. 237, 5a-e. * P. miniscaensis (Owen), Wis., 5a, b, cran., 5c, librigena, 5d, e, pyg., all x0.7 (53)., Fig. 237, 5f-j. P. granulosa (Owen), Wis., 5f, g, cran., x1.2, x1, 5 h, librigena, x1, 5 i, j, pyg., x1(8, 53).
Synonyms
Asioptychaspis, Fengshania
Geographic Distribution
N.Am.E.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 subrectangular to subquadrate, front rounded, anterior lobe commonly swollen, anterior border furrow obsolete, eyes opposite or in front of mid-length of glabella, fixigenae upsloping, with palpebral areas slightly more than 0.3 of glabellar width, posterior areas stout, of medium length (tr.). Pygidium with all furrows distinct, 4 or 5 axial rings, 4 or 5 pleurae, border flat. Surface granulose, irregular ridges invariably on border of cephalon and in some also on genae and glabella.