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Virgoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Geisonoceratidae
Formal Genus Name and Reference:
Virgoceras FLOWER, 1939, p. 162
Type Species:
Orthoceras palemon BARRANDE, 1870, pl. 394, OD
Images
(Click to enlarge in a new window)
Fig. 169, 2. *V. palemon (Barrande), Czech., 2a, b, dorsoventral sec., lat. view, x0.75 (5).
Synonyms
Geographic Distribution
USA (Ind.), Eu. (Czech.)
Age Range
Beginning Stage in Treatise Usage:
M.Sil.
Beginning International Stage:
Sheinwoodian
Fraction Up In Beginning Stage:
0
Beginning Date:
432.93
Ending Stage in Treatise Usage:
M.Sil.
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Uncompressed orthocones with straight transverse sutures and surface marked by fine oblique or transverse and (in some species) longitudinal lines. Siphuncle central or subcentral, orthochoanitic, siphuncular deposits of annulosiphonate deposits fusing to form continuous siphuncular lining.
References
Flower, R. H., 1939, Study of the Pseudorthoceratidae: Palaeont. Americana, v. 2, no. 10, 214 p., 9 pl., 22 fig.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Geisonoceratidae
Formal Genus Name and Reference:
Virgoceras FLOWER, 1939, p. 162
Type Species:
Orthoceras palemon BARRANDE, 1870, pl. 394, OD
Images
(Click to enlarge in a new window)
Fig. 169, 2. *V. palemon (Barrande), Czech., 2a, b, dorsoventral sec., lat. view, x0.75 (5).
Synonyms
Geographic Distribution
USA (Ind.), Eu. (Czech.)
Age Range
Beginning Stage in Treatise Usage:
M.Sil.
Beginning International Stage:
Sheinwoodian
Fraction Up In Beginning Stage:
0
Beginning Date:
432.93
Ending Stage in Treatise Usage:
M.Sil.
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Uncompressed orthocones with straight transverse sutures and surface marked by fine oblique or transverse and (in some species) longitudinal lines. Siphuncle central or subcentral, orthochoanitic, siphuncular deposits of annulosiphonate deposits fusing to form continuous siphuncular lining.
References
Flower, R. H., 1939, Study of the Pseudorthoceratidae: Palaeont. Americana, v. 2, no. 10, 214 p., 9 pl., 22 fig.