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Trematorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Orthidiellidae
Formal Genus Name and Reference:
Trematorthis Ulrich & COOPER, 1938, p. 112
Type Species:
T. masoni, OD
Images
(Click to enlarge in a new window)
Fig. 539, 4a-f. *T. masoni, Llanvirn, Nevada, $a$, ventral interior, $X_{3}$, $b$, dorsal interior, $X_{3}$, $c, d$, dorsal, ventral views of conjoined valves, $X_{3}$, $e$, posterior views of ventral valve, $X_{3}$, $f$, posterior view of dorsal valve, x4$ (Cooper, 1956).
Synonyms
Geographic Distribution
North America, South America (Argentina)
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:
0
Ending Date:
463.02
Description
Subquadrate with variable cardinal extremities, ramicostellate, delthyrium partly covered by deltidium with apical foramen, notothyrium open, ventral interarea relatively long, curved, ventral muscle scar suboval.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Orthidiellidae
Formal Genus Name and Reference:
Trematorthis Ulrich & COOPER, 1938, p. 112
Type Species:
T. masoni, OD
Images
(Click to enlarge in a new window)
Fig. 539, 4a-f. *T. masoni, Llanvirn, Nevada, $a$, ventral interior, $X_{3}$, $b$, dorsal interior, $X_{3}$, $c, d$, dorsal, ventral views of conjoined valves, $X_{3}$, $e$, posterior views of ventral valve, $X_{3}$, $f$, posterior view of dorsal valve, x4$ (Cooper, 1956).
Synonyms
Geographic Distribution
North America, South America (Argentina)
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:
0
Ending Date:
463.02
Description
Subquadrate with variable cardinal extremities, ramicostellate, delthyrium partly covered by deltidium with apical foramen, notothyrium open, ventral interarea relatively long, curved, ventral muscle scar suboval.