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Derbyia
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Orthotetida
Superfamily:
Orthotetoidea
Family:
Derbyiidae
Formal Genus Name and Reference:
Derbyia WAAGEN, 1884, p. 576
Type Species:
D. regularis, SD Hall & CLARKE, 1892, p. 262
Images
(Click to enlarge in a new window)
Fig. 474, 2a-c. *D$. regularis, Amb Formation, Lower Permian, Salt Range, Pakistan, dorsal, ventral, posterior views of shell, X1 (new)., ——FIG. 474, 2d, e. D. profunda Cooper & Grant, Wolfcampian, Texas, d, paratype, broken specimen showing cardinalia and dental ridges, $X_{1}$, $e$, paratype, posterior view of dorsal valve, x1$ (Cooper & Grant, 1974)., ——FIG. 474, 2f. D. filosa Cooper & Grant, Wordian, Texas, holotype, posteriorly tilted ventral valve interior, X 1 (Cooper & Grant, 1974).
Synonyms
Derbyaeconcha, Grabauellina, Magniderbyia, Pseudoderbyia, Plicatoderbya, Wardakia, Paraderbyia
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Carboniferous
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
A large, normally distorted in shape and uniplicate, finely costellate by branching and intercalation, pseudodeltidium flat with monticulus, chilidium small, occasionally with median groove, vestigial in later, larger species, dental ridges frequently convergent apically on high ventral median septum ankylosed to internal surface of pseudodeltidium, flabellate ventral muscle scar usually deeply impressed, occasionally with raised boundary, ridgelike brachiophores arising from massive socket plates and ridges fused with cardinal process of variable length, subcircular dorsal adductor scars variably impressed about low myophragm, commonly with interrupted rugation like low plication. Upper Carboniferous-Upper Permian: cosmopolitan.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Orthotetida
Superfamily:
Orthotetoidea
Family:
Derbyiidae
Formal Genus Name and Reference:
Derbyia WAAGEN, 1884, p. 576
Type Species:
D. regularis, SD Hall & CLARKE, 1892, p. 262
Images
(Click to enlarge in a new window)
Fig. 474, 2a-c. *D$. regularis, Amb Formation, Lower Permian, Salt Range, Pakistan, dorsal, ventral, posterior views of shell, X1 (new)., ——FIG. 474, 2d, e. D. profunda Cooper & Grant, Wolfcampian, Texas, d, paratype, broken specimen showing cardinalia and dental ridges, $X_{1}$, $e$, paratype, posterior view of dorsal valve, x1$ (Cooper & Grant, 1974)., ——FIG. 474, 2f. D. filosa Cooper & Grant, Wordian, Texas, holotype, posteriorly tilted ventral valve interior, X 1 (Cooper & Grant, 1974).
Synonyms
Derbyaeconcha, Grabauellina, Magniderbyia, Pseudoderbyia, Plicatoderbya, Wardakia, Paraderbyia
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Carboniferous
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
A large, normally distorted in shape and uniplicate, finely costellate by branching and intercalation, pseudodeltidium flat with monticulus, chilidium small, occasionally with median groove, vestigial in later, larger species, dental ridges frequently convergent apically on high ventral median septum ankylosed to internal surface of pseudodeltidium, flabellate ventral muscle scar usually deeply impressed, occasionally with raised boundary, ridgelike brachiophores arising from massive socket plates and ridges fused with cardinal process of variable length, subcircular dorsal adductor scars variably impressed about low myophragm, commonly with interrupted rugation like low plication. Upper Carboniferous-Upper Permian: cosmopolitan.