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Plectorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Plectorthoidea
Family:
Plectorthidae
Formal Genus Name and Reference:
Plectorthis Hall & CLARKE, 1892, p. 194
Type Species:
Orthis plicatella HALL, 1847, p. 122, OD
Images
(Click to enlarge in a new window)
Fig. 548, 2a, b. *P. plicatella (Hall), Ashgill, Ohio, $a$, dorsal interior, x1.5, b$, ventral interior, x1.5$ (Schuchert & Cooper, 1932).-Fig. 548, 2c, d. P. compacta, Caradoc, Tennessee, $c$, dorsal interior, x2$
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Transversely semioval, subequally gently biconvex with faintly sulcate to uniplicate anterior commissure, costate to coarsely costellate, filate, ventral interarea short, shorter dorsal interarea orthocline to faintly distributed aditicules in some species
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Plectorthoidea
Family:
Plectorthidae
Formal Genus Name and Reference:
Plectorthis Hall & CLARKE, 1892, p. 194
Type Species:
Orthis plicatella HALL, 1847, p. 122, OD
Images
(Click to enlarge in a new window)
Fig. 548, 2a, b. *P. plicatella (Hall), Ashgill, Ohio, $a$, dorsal interior, x1.5, b$, ventral interior, x1.5$ (Schuchert & Cooper, 1932).-Fig. 548, 2c, d. P. compacta, Caradoc, Tennessee, $c$, dorsal interior, x2$
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Transversely semioval, subequally gently biconvex with faintly sulcate to uniplicate anterior commissure, costate to coarsely costellate, filate, ventral interarea short, shorter dorsal interarea orthocline to faintly distributed aditicules in some species