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Orthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Orthidae
Formal Genus Name and Reference:
Orthis DALMAN, 1828, p. 93
Type Species:
O. callactis Dalman, 1828, p. 112, SD DAVIDSON, 1853, p. 101
Images
(Click to enlarge in a new window)
Fig. 523, 3a-g. *O. callactis Dalman, Arenig-Llanvirn, Sweden, $a$, dorsal exterior, x2.5, b$, dorsal interior, x2, c-e$, dorsal, ventral, lateral views of conjoined valves, $X_{2}$, $f$, ventral interior, x1}, g$, details of capillate ornament, $\\times_{10}$ (Jaanusson & Bassett, 1993).
Synonyms
Geographic Distribution
Baltoscandia
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
Large, planoconvex to weakly concavoconvex, rectimarginate, costate, and capillate, ventral muscle scar suboval, brachiophores widely divergent rods, ventral vascula media parallel proximally
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Orthidae
Formal Genus Name and Reference:
Orthis DALMAN, 1828, p. 93
Type Species:
O. callactis Dalman, 1828, p. 112, SD DAVIDSON, 1853, p. 101
Images
(Click to enlarge in a new window)
Fig. 523, 3a-g. *O. callactis Dalman, Arenig-Llanvirn, Sweden, $a$, dorsal exterior, x2.5, b$, dorsal interior, x2, c-e$, dorsal, ventral, lateral views of conjoined valves, $X_{2}$, $f$, ventral interior, x1}, g$, details of capillate ornament, $\\times_{10}$ (Jaanusson & Bassett, 1993).
Synonyms
Geographic Distribution
Baltoscandia
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
Large, planoconvex to weakly concavoconvex, rectimarginate, costate, and capillate, ventral muscle scar suboval, brachiophores widely divergent rods, ventral vascula media parallel proximally