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Virgiana
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Pentamerida
Suborder:
Pentameridina
Superfamily:
Pentameroidea
Family:
Virgianidae
Subfamily:
Virgianinae
Formal Genus Name and Reference:
Virgiana TWENHOFEL, 1914, p. 27
Type Species:
*Pentamerus barrandei BILLINGS, 1857, p. 296, OD
Images
(Click to enlarge in a new window)
Fig. 643, 1a–g. *V. (V.) barrandei (B ILLINGS ), Anticosti, Quebec, Canada; a–d, lateral, ventral, dorsal, and posterior views of articulated specimen, Becscie River Formation, ×1 (Schuchert & Cooper, 1932); e, anterior view of articulated specimen, Becscie River Formation, ×1 (Amsden, 1965); f–g, ventral and lateral of articulated specimen, Gun River Formation, × 1 (Boucot, Johnson, & Rubel, 1971).——Fig. 643, 1h–j. V. (V.) mayvillensis, Mayville Dolomite, Mayville, Wisconsin, USA; h–i, dorsal and posterior views of articulated specimens, × 1; j, dorsal interior, × 2 (Boucot, Johnson, & Rubel, 1971).
Synonyms
Geographic Distribution
North America, Asia
Age Range
Beginning Stage in Treatise Usage:
Silurian (lower Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian (middle Llandovery)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
Small to medium, ventribiconvex, subcircular to elongate, weak to strong costae to costellate, spondylium short with median septum short.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Pentamerida
Suborder:
Pentameridina
Superfamily:
Pentameroidea
Family:
Virgianidae
Subfamily:
Virgianinae
Formal Genus Name and Reference:
Virgiana TWENHOFEL, 1914, p. 27
Type Species:
*Pentamerus barrandei BILLINGS, 1857, p. 296, OD
Images
(Click to enlarge in a new window)
Fig. 643, 1a–g. *V. (V.) barrandei (B ILLINGS ), Anticosti, Quebec, Canada; a–d, lateral, ventral, dorsal, and posterior views of articulated specimen, Becscie River Formation, ×1 (Schuchert & Cooper, 1932); e, anterior view of articulated specimen, Becscie River Formation, ×1 (Amsden, 1965); f–g, ventral and lateral of articulated specimen, Gun River Formation, × 1 (Boucot, Johnson, & Rubel, 1971).——Fig. 643, 1h–j. V. (V.) mayvillensis, Mayville Dolomite, Mayville, Wisconsin, USA; h–i, dorsal and posterior views of articulated specimens, × 1; j, dorsal interior, × 2 (Boucot, Johnson, & Rubel, 1971).
Synonyms
Geographic Distribution
North America, Asia
Age Range
Beginning Stage in Treatise Usage:
Silurian (lower Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian (middle Llandovery)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
Small to medium, ventribiconvex, subcircular to elongate, weak to strong costae to costellate, spondylium short with median septum short.