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Pseudospiriferina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Pennospiriferinoidea
Family:
Spiriferellinidae
Formal Genus Name and Reference:
Pseudospiriferina Yang & XU, 1966, p. 41
Type Species:
P. variabilis, OD
Images
(Click to enlarge in a new window)
Fig. 1278, 4a-f. * P. variabilis, Guizhou, a, holotype, dorsal view, X4, b-e, dorsal, ventral, lateral, and posterior views, X1, f, transverse section, approximately X3 (Yang & Xu, 1966).
Synonyms
Geographic Distribution
southwestern China
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic
Ending International Stage:
Ladinian
Fraction Up In Ending Stage:
100
Ending Date:
237
Description
Small to medium size, transversely to longitudinally subovate, unequally biconvex, cardinal extremities often mucronate or angular, rarely rounded, maximum width usually at hinge line, ventral valve strongly inflated with acute, incurved beak and sharp, angular beak ridges, ventral interarea moderately high, concave, apsacline or nearly catacline, fold and sulcus well defined, smooth, usually rounded, wider than lateral plications, fold may be flattened or with weak median groove, lateral slopes with few (3 to 4, rarely 5 to 6) strong, rounded plicae separated by interspaces almost as wide, anterior growth varices crowded, slightly lamellose, microornament of fine, densely spaced pustules, dental adminicula and median septum discrete, punctae densely and evenly distributed
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Pennospiriferinoidea
Family:
Spiriferellinidae
Formal Genus Name and Reference:
Pseudospiriferina Yang & XU, 1966, p. 41
Type Species:
P. variabilis, OD
Images
(Click to enlarge in a new window)
Fig. 1278, 4a-f. * P. variabilis, Guizhou, a, holotype, dorsal view, X4, b-e, dorsal, ventral, lateral, and posterior views, X1, f, transverse section, approximately X3 (Yang & Xu, 1966).
Synonyms
Geographic Distribution
southwestern China
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Middle Triassic
Ending International Stage:
Ladinian
Fraction Up In Ending Stage:
100
Ending Date:
237
Description
Small to medium size, transversely to longitudinally subovate, unequally biconvex, cardinal extremities often mucronate or angular, rarely rounded, maximum width usually at hinge line, ventral valve strongly inflated with acute, incurved beak and sharp, angular beak ridges, ventral interarea moderately high, concave, apsacline or nearly catacline, fold and sulcus well defined, smooth, usually rounded, wider than lateral plications, fold may be flattened or with weak median groove, lateral slopes with few (3 to 4, rarely 5 to 6) strong, rounded plicae separated by interspaces almost as wide, anterior growth varices crowded, slightly lamellose, microornament of fine, densely spaced pustules, dental adminicula and median septum discrete, punctae densely and evenly distributed