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Cyrtonotella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Nanorthidae
Formal Genus Name and Reference:
Cyrtonotella Schuchert & COOPER, 1931, p. 243
Type Species:
Orthis semicircularis von EICHWALD, 1829, p. 276, OD
Images
(Click to enlarge in a new window)
Fig. 537, 4a-c. * C. semicircularis (von Eichwald), middle Ordovician, Russia, ventral, dorsal, posterior views of conjoined valves, X5 (Schuchert & Cooper, 1932)., Fig. 537, 4d, e. C. kukersiana (Wysogórski), middle Ordovician, Russia, $d$, dorsal interior, x2.25$, e, internal mold of ventral valve, x1$ (Sarytcheva, 1960).
Synonyms
Geographic Distribution
Northern Hemisphere
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Upper Ordovician (Caradoc)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
"Medium size, transversely semioval with acute cardinal extremities, plano- to concavoconvex, rectimarginate, coarsely costellate and filate, ventral interarea anacline, divergent dental plates, short, divergent, bladelike brachiophores."
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Nanorthidae
Formal Genus Name and Reference:
Cyrtonotella Schuchert & COOPER, 1931, p. 243
Type Species:
Orthis semicircularis von EICHWALD, 1829, p. 276, OD
Images
(Click to enlarge in a new window)
Fig. 537, 4a-c. * C. semicircularis (von Eichwald), middle Ordovician, Russia, ventral, dorsal, posterior views of conjoined valves, X5 (Schuchert & Cooper, 1932)., Fig. 537, 4d, e. C. kukersiana (Wysogórski), middle Ordovician, Russia, $d$, dorsal interior, x2.25$, e, internal mold of ventral valve, x1$ (Sarytcheva, 1960).
Synonyms
Geographic Distribution
Northern Hemisphere
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Upper Ordovician (Caradoc)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
"Medium size, transversely semioval with acute cardinal extremities, plano- to concavoconvex, rectimarginate, coarsely costellate and filate, ventral interarea anacline, divergent dental plates, short, divergent, bladelike brachiophores."