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Hirnantia
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Orthida
Suborder:
Dalmanellidina
Superfamily:
Enteletoidea
Family:
Draboviidae
Subfamily:
Draboviinae
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)
Fig . 603,1a–g. *H. sagittifera (M’COY ), Ashgill; a,b, normal, posterior views of internal mold of dorsal valve, Scotland, ×2; c, rubber replica of dorsal exterior, Scotland, ×2 (Harper, 1989); d, internal mold of ventral valve, Bohemia, ×1.5; e, internal mold of dorsal valve, Bohemia,×1.7 (Havlícek,ˇ 1977a); f, internal mold of dorsal valve, Poland, × 3.3; g, internal mold of ventral valve, Poland, × 6.6 (Temple, 1965).
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
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Orthida
Suborder:
Dalmanellidina
Superfamily:
Enteletoidea
Family:
Draboviidae
Subfamily:
Draboviinae
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)
Fig . 603,1a–g. *H. sagittifera (M’COY ), Ashgill; a,b, normal, posterior views of internal mold of dorsal valve, Scotland, ×2; c, rubber replica of dorsal exterior, Scotland, ×2 (Harper, 1989); d, internal mold of ventral valve, Bohemia, ×1.5; e, internal mold of dorsal valve, Bohemia,×1.7 (Havlícek,ˇ 1977a); f, internal mold of dorsal valve, Poland, × 3.3; g, internal mold of ventral valve, Poland, × 6.6 (Temple, 1965).
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