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Perigeyerella
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Orthotetida
Superfamily:
Orthotetoidea
Family:
Meekellidae
Formal Genus Name and Reference:
Perigeyerella Wang, 1955a, p. 101, Perigeyerella WANG, 1955b, p. 346
Type Species:
P. costellata, OD
Images
(Click to enlarge in a new window)
Fig. 477, 3a-g. * P. costellata, Upper Permian, northern Guizhou, $a$, dorsal view of complete shell, x1}, b-d$, serial sections at intervals shown on $a, X 2$ (Wang, 1955), $e-g$, dorsal, ventral, lateral views of shell, x1$ (Yang & others, 1977)."
Synonyms
Geographic Distribution
China
Age Range
Beginning Stage in Treatise Usage:
Upper Permian
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Similar to Geyerella but without secondary costation and rounded in outline, usually with less conical ventral valve with sharply pointed beak, broadly unisulcate, finely costellate mainly by branching cancellated by strong, concentric fila, dental plates becoming less convergent with growth so that narrow chamber with supporting median septum is characteristic of young ventral valve and sessile septal chamber or discrete dental plates typical of adult valve. Upper Permian: China.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Orthotetida
Superfamily:
Orthotetoidea
Family:
Meekellidae
Formal Genus Name and Reference:
Perigeyerella Wang, 1955a, p. 101, Perigeyerella WANG, 1955b, p. 346
Type Species:
P. costellata, OD
Images
(Click to enlarge in a new window)
Fig. 477, 3a-g. * P. costellata, Upper Permian, northern Guizhou, $a$, dorsal view of complete shell, x1}, b-d$, serial sections at intervals shown on $a, X 2$ (Wang, 1955), $e-g$, dorsal, ventral, lateral views of shell, x1$ (Yang & others, 1977)."
Synonyms
Geographic Distribution
China
Age Range
Beginning Stage in Treatise Usage:
Upper Permian
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Similar to Geyerella but without secondary costation and rounded in outline, usually with less conical ventral valve with sharply pointed beak, broadly unisulcate, finely costellate mainly by branching cancellated by strong, concentric fila, dental plates becoming less convergent with growth so that narrow chamber with supporting median septum is characteristic of young ventral valve and sessile septal chamber or discrete dental plates typical of adult valve. Upper Permian: China.