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Orthotetes
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Orthotetida
Superfamily:
Orthotetoidea
Family:
Orthotetidae
Formal Genus Name and Reference:
Orthotetes Fischer de WALDHEIM, 1829, p. 375
Type Species:
O. radiata Fischer de Waldheim, 1850, p. 491, SD GIRTY, 1909, p. 192
Images
(Click to enlarge in a new window)
Fig. 469, 2a-d. *O. radiata Fischer de Waldheim, Moscovian, Russia, $a$, ventral valve exterior, x1$ (Sokolskaya, 1954), $b, c$, ventral valve interior, dorsal valve interior, $X_{1}$, $d$, dorsal valve interior, x2$ (Manankov, 1973).
Synonyms
Pseudoorthotetes, Orthotetoides
Geographic Distribution
Eurasia
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Lower Permian
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Biconvex, rectimarginate, finely costellate by branching, usually with symmetrical ventral beak, convex pseudodeltidium, dorsal interarea linear to vestigial, chilidium small, grooved, dental ridges strong, convergent on high ventral median septum to define small delthyrial chamber commonly filled with secondary shell, less commonly extending anteromedianly for entire length of ventral interarea, socket ridges recurved, ventral muscle scar impressed, large, flabellate, dorsal myophragm onyms of Orthotetes. Lower Carboniferous-Lower Permian: Eurasia.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Orthotetida
Superfamily:
Orthotetoidea
Family:
Orthotetidae
Formal Genus Name and Reference:
Orthotetes Fischer de WALDHEIM, 1829, p. 375
Type Species:
O. radiata Fischer de Waldheim, 1850, p. 491, SD GIRTY, 1909, p. 192
Images
(Click to enlarge in a new window)
Fig. 469, 2a-d. *O. radiata Fischer de Waldheim, Moscovian, Russia, $a$, ventral valve exterior, x1$ (Sokolskaya, 1954), $b, c$, ventral valve interior, dorsal valve interior, $X_{1}$, $d$, dorsal valve interior, x2$ (Manankov, 1973).
Synonyms
Pseudoorthotetes, Orthotetoides
Geographic Distribution
Eurasia
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Lower Permian
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Biconvex, rectimarginate, finely costellate by branching, usually with symmetrical ventral beak, convex pseudodeltidium, dorsal interarea linear to vestigial, chilidium small, grooved, dental ridges strong, convergent on high ventral median septum to define small delthyrial chamber commonly filled with secondary shell, less commonly extending anteromedianly for entire length of ventral interarea, socket ridges recurved, ventral muscle scar impressed, large, flabellate, dorsal myophragm onyms of Orthotetes. Lower Carboniferous-Lower Permian: Eurasia.