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Anomalorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Anomalorthidae
Formal Genus Name and Reference:
Anomalorthis Ulrich & COOPER, 1936b, p. 622
Type Species:
A. utahensis, OD
Images
(Click to enlarge in a new window)
Fig. 527, 1a-e. *A. utahensis, ArenigLlanvirn, Utah, $a-c$, exterior together with normal
Synonyms
Geographic Distribution
USA (Utah, Nevada, Oklahoma, Vermont)
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Arenig)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Lower Ordovician (Llanvirn)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
56.9
Ending Date:
463.02
Description
Unequally biconvex to convexoconcave, weakly uniplicate, multicostellate valves with long ventral interarea, delthyrium open with small apical plate, ventral interior with muscle scars impressed on raised callus, dorsal interior with simple ridgelike cardinal process.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Anomalorthidae
Formal Genus Name and Reference:
Anomalorthis Ulrich & COOPER, 1936b, p. 622
Type Species:
A. utahensis, OD
Images
(Click to enlarge in a new window)
Fig. 527, 1a-e. *A. utahensis, ArenigLlanvirn, Utah, $a-c$, exterior together with normal
Synonyms
Geographic Distribution
USA (Utah, Nevada, Oklahoma, Vermont)
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Arenig)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Lower Ordovician (Llanvirn)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
56.9
Ending Date:
463.02
Description
Unequally biconvex to convexoconcave, weakly uniplicate, multicostellate valves with long ventral interarea, delthyrium open with small apical plate, ventral interior with muscle scars impressed on raised callus, dorsal interior with simple ridgelike cardinal process.