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Platyorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Dalmanelloidea
Family:
Platyorthidae
Formal Genus Name and Reference:
Platyorthis Schuchert & COOPER, 1931, p. 246
Type Species:
Orthis planoconvexa HALL, 1859a, p. 168, OD
Images
(Click to enlarge in a new window)
Fig. 588, 1a-e. *P. planoconvexa (HALL), Emsian, eastern North America, $a-c$, dorsal, ventral, lateral views of conjoined valves, x1, d$, ventral interior, x1.5, e$, dorsal interior, x1.5$ (Schuchert & Cooper, 1932)."
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
upper Silurian (Přídolí)
Beginning International Stage:
Pridoli
Fraction Up In Beginning Stage:
0
Beginning Date:
422.73
Ending Stage in Treatise Usage:
Middle Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
"Subcircular, biconvex valves with aditicules, ventral interarea long, curved, and orthocline, dorsal interarea vestigial, ventral interior with quadrate muscle scar and median ridge, dorsal interior with brachiophores as spikelike rods with divergent plates, muscle scar with anterior scars larger than posterior pair."
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Dalmanelloidea
Family:
Platyorthidae
Formal Genus Name and Reference:
Platyorthis Schuchert & COOPER, 1931, p. 246
Type Species:
Orthis planoconvexa HALL, 1859a, p. 168, OD
Images
(Click to enlarge in a new window)
Fig. 588, 1a-e. *P. planoconvexa (HALL), Emsian, eastern North America, $a-c$, dorsal, ventral, lateral views of conjoined valves, x1, d$, ventral interior, x1.5, e$, dorsal interior, x1.5$ (Schuchert & Cooper, 1932)."
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
upper Silurian (Přídolí)
Beginning International Stage:
Pridoli
Fraction Up In Beginning Stage:
0
Beginning Date:
422.73
Ending Stage in Treatise Usage:
Middle Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
"Subcircular, biconvex valves with aditicules, ventral interarea long, curved, and orthocline, dorsal interarea vestigial, ventral interior with quadrate muscle scar and median ridge, dorsal interior with brachiophores as spikelike rods with divergent plates, muscle scar with anterior scars larger than posterior pair."