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Eoorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Plectorthoidea
Family:
Eoorthidae
Formal Genus Name and Reference:
Eoorthis WALCOTT, 1908, p. 102
Type Species:
Orthis remnicha WINCHELL, 1885, p. 317, OD
Images
(Click to enlarge in a new window)
Fig. 555, 1a-e. *E. remnicha (Winchell), Upper Cambrian, Montana, $a, b$, interior, exterior of dorsal valve, $X_{2}, c, d$, internal mold, rubber replica of ventral valve, $X_{3}$ (Bell, 1941), $e$, dorsal interior, x2$ (Schuchert & Cooper, 1932).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Radial ornamentation of coarse costellae with superimposed capillae, dental plates receding, ventral muscle scar enclosed by a low ridge, cardinal process simple, dorsal median ridge wide
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Plectorthoidea
Family:
Eoorthidae
Formal Genus Name and Reference:
Eoorthis WALCOTT, 1908, p. 102
Type Species:
Orthis remnicha WINCHELL, 1885, p. 317, OD
Images
(Click to enlarge in a new window)
Fig. 555, 1a-e. *E. remnicha (Winchell), Upper Cambrian, Montana, $a, b$, interior, exterior of dorsal valve, $X_{2}, c, d$, internal mold, rubber replica of ventral valve, $X_{3}$ (Bell, 1941), $e$, dorsal interior, x2$ (Schuchert & Cooper, 1932).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Radial ornamentation of coarse costellae with superimposed capillae, dental plates receding, ventral muscle scar enclosed by a low ridge, cardinal process simple, dorsal median ridge wide