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Hesperorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Hesperorthidae
Formal Genus Name and Reference:
Hesperorthis Schuchert & COOPER, 1931, p. 244
Type Species:
Orthis tricenaria CONRAD, 1843, p. 333, OD
Images
(Click to enlarge in a new window)
Fig. 534, $1 a-f .{ }^{*} H$. tricenaria (Conrad), Caradoc, eastern USA, $a$, ventral interior, $X_{2}, b$, dorsal interior, $X_{2}$, $c-e$, ventral, dorsal, posterior views of conjoined valves, x1 . 5, ~} f$, detail of ventral interarea, x1 . 5}$ (Schuchert & Cooper, 1932).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Llanvirn), middle Silurian (Wenlock)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
middle Silurian (Wenlock)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Medium to large, elongately semioval with variable cardinal extremities, planoconvex, rectimarginate, costate, capillate, delthyrium with apical plate, notothyrium with antigydium, interareas relatively long and flat, posterior pair of dorsal adductor scars larger than anterior.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Hesperorthidae
Formal Genus Name and Reference:
Hesperorthis Schuchert & COOPER, 1931, p. 244
Type Species:
Orthis tricenaria CONRAD, 1843, p. 333, OD
Images
(Click to enlarge in a new window)
Fig. 534, $1 a-f .{ }^{*} H$. tricenaria (Conrad), Caradoc, eastern USA, $a$, ventral interior, $X_{2}, b$, dorsal interior, $X_{2}$, $c-e$, ventral, dorsal, posterior views of conjoined valves, x1 . 5, ~} f$, detail of ventral interarea, x1 . 5}$ (Schuchert & Cooper, 1932).
Synonyms
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Llanvirn), middle Silurian (Wenlock)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
middle Silurian (Wenlock)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Medium to large, elongately semioval with variable cardinal extremities, planoconvex, rectimarginate, costate, capillate, delthyrium with apical plate, notothyrium with antigydium, interareas relatively long and flat, posterior pair of dorsal adductor scars larger than anterior.