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Yidunella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Hemithiridoidea
Family:
Cyclothyrididae
Formal Genus Name and Reference:
Yidunella Ching, Sun, & Ye in Ching & OTHERS, 1979, p. 148
Type Species:
Y. magna, OD
Images
(Click to enlarge in a new window)
Fig. 905, 2a-l. *Y. magna, Sichuan, $a-c$, holotype, dorsal, lateral, anterior views, NIGP 42862, x1, d-l$, paratype, transverse serial sections, distances in mm from ventral umbo, 0.25, 0.85, $0.95, 1.15, 1.25, 1.85, 2.45, 3.25, 3.95$, NIGP 42859 (Ching & others, 1979).
Synonyms
Geographic Distribution
southwestern China (Tibet, Sichuan)
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Upper Triassic
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Large, asymmetrical, nearly convexoplane in lateral view, fold and sulcus starting from umbones, but more marked anteriorly, plicae simple, appearing near beak, round-subangular, posterior smooth area obscure or absent, beak short, slightly incurved, beak ridges angular, planarea concave, foramen hypothyrid, delthyrium covered by thickened symphytium. Dental plates subparallel or ventrally convergent, dorsal septum high and long, septalium wide, crura canaliform, extending along plane of commissure, bladelike proximally, passing distally to semicircular canal.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Hemithiridoidea
Family:
Cyclothyrididae
Formal Genus Name and Reference:
Yidunella Ching, Sun, & Ye in Ching & OTHERS, 1979, p. 148
Type Species:
Y. magna, OD
Images
(Click to enlarge in a new window)
Fig. 905, 2a-l. *Y. magna, Sichuan, $a-c$, holotype, dorsal, lateral, anterior views, NIGP 42862, x1, d-l$, paratype, transverse serial sections, distances in mm from ventral umbo, 0.25, 0.85, $0.95, 1.15, 1.25, 1.85, 2.45, 3.25, 3.95$, NIGP 42859 (Ching & others, 1979).
Synonyms
Geographic Distribution
southwestern China (Tibet, Sichuan)
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Upper Triassic
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Large, asymmetrical, nearly convexoplane in lateral view, fold and sulcus starting from umbones, but more marked anteriorly, plicae simple, appearing near beak, round-subangular, posterior smooth area obscure or absent, beak short, slightly incurved, beak ridges angular, planarea concave, foramen hypothyrid, delthyrium covered by thickened symphytium. Dental plates subparallel or ventrally convergent, dorsal septum high and long, septalium wide, crura canaliform, extending along plane of commissure, bladelike proximally, passing distally to semicircular canal.