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Archaeorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Nanorthidae
Formal Genus Name and Reference:
Archaeorthis Schuchert & COOPER, 1931, p. 243
Type Species:
Orthis electra BILLINGS, 1865 in 1861-1865, p. 79, OD
Images
(Click to enlarge in a new window)
Fig. 537, 2a. *A. electra (Billings), Tremadoc, Quebec, dorsal interior, x4$ (Schuchert & Cooper, 1932)., Fig. 537, 2b-d. A. biconvexa, Tremadoc, Oklahoma, $b$, dorsal interior, $\\mathbf{X}_{\\mathbf{3}}$, $c$, ventral interior, $\\mathbf{X}_{\\mathbf{3}}$, $d$, ventral interior, $\\times_{3}$ (Cooper, 1956).
Synonyms
Geographic Distribution
North America, Europe, South America, Asia
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Lower Ordovician (Arenig)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Medium size, subcircular with obtuse cardinal extremities, multicostellate, elongately oval ventral muscle scar impressed on callosity prolonged forward of scar as wide, median ridge, cardinal process absent
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Nanorthidae
Formal Genus Name and Reference:
Archaeorthis Schuchert & COOPER, 1931, p. 243
Type Species:
Orthis electra BILLINGS, 1865 in 1861-1865, p. 79, OD
Images
(Click to enlarge in a new window)
Fig. 537, 2a. *A. electra (Billings), Tremadoc, Quebec, dorsal interior, x4$ (Schuchert & Cooper, 1932)., Fig. 537, 2b-d. A. biconvexa, Tremadoc, Oklahoma, $b$, dorsal interior, $\\mathbf{X}_{\\mathbf{3}}$, $c$, ventral interior, $\\mathbf{X}_{\\mathbf{3}}$, $d$, ventral interior, $\\times_{3}$ (Cooper, 1956).
Synonyms
Geographic Distribution
North America, Europe, South America, Asia
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Lower Ordovician (Arenig)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Medium size, subcircular with obtuse cardinal extremities, multicostellate, elongately oval ventral muscle scar impressed on callosity prolonged forward of scar as wide, median ridge, cardinal process absent