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Hirnantia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Enteletoidea
Family:
Draboviidae
Formal Genus Name and Reference:
Hirnantia LAMONT, 1935, p. 313
Type Species:
Orthis sagittifera M’COY, 1851, p. 398, OD
Images
(Click to enlarge in a new window)
Synonyms
Villicundella
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:
lower Silurian (Llandovery)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Subcircular, dorsibiconvex, rectimarginate to weakly unisulcate valves with long straight ventral interarea; ventral interior with subtriangular to suboval muscle scar, dorsal interior with small myophore and long shaft
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Enteletoidea
Family:
Draboviidae
Formal Genus Name and Reference:
Hirnantia LAMONT, 1935, p. 313
Type Species:
Orthis sagittifera M’COY, 1851, p. 398, OD
Images
(Click to enlarge in a new window)Synonyms
Villicundella
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:
lower Silurian (Llandovery)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Subcircular, dorsibiconvex, rectimarginate to weakly unisulcate valves with long straight ventral interarea; ventral interior with subtriangular to suboval muscle scar, dorsal interior with small myophore and long shaft