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Stereoplasmoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Pseudorthocerataceae
Family:
Stereoplasmoceratidae
Formal Genus Name and Reference:
Stereoplasmoceras GRABAU, 1922, p. 65
Type Species:
S. pseudoseptatum, OD
Images
(Click to enlarge in a new window)
Fig. 184,1. S. longicameratum Sweet, Norway, 1a, diagram. dorsoventral sec., x1.3, 1 b, lat. view, x0.7 (178) -- Fig. 184,2. S. tofangoense (Kobayashi), S.Manchuria, long. sec., x1 (105). -- Fig. 184,3. S. approximatum (Sweet), Norway, diagram. dorsoventral sec., x1.3 (178)
Synonyms
Stereoplasmocerina
Geographic Distribution
Eu. (Norway), Asia (China-Korea-S. Manchuria)
Age Range
Beginning Stage in Treatise Usage:
M.Ord.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Smooth, longiconic orthocones of subcircular section but with somewhat flattened venter, Siphuncle relatively large, subcentral or between center and venter, cyrtochoanitic, empty, or with continuous apparently nonsegmental organic lining, segments moderately to considerably expanded within camerae, Camerae with hyposeptal and episeptal, or with episeptal and mural deposits invariably well developed
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Pseudorthocerataceae
Family:
Stereoplasmoceratidae
Formal Genus Name and Reference:
Stereoplasmoceras GRABAU, 1922, p. 65
Type Species:
S. pseudoseptatum, OD
Images
(Click to enlarge in a new window)
Fig. 184,1. S. longicameratum Sweet, Norway, 1a, diagram. dorsoventral sec., x1.3, 1 b, lat. view, x0.7 (178) -- Fig. 184,2. S. tofangoense (Kobayashi), S.Manchuria, long. sec., x1 (105). -- Fig. 184,3. S. approximatum (Sweet), Norway, diagram. dorsoventral sec., x1.3 (178)
Synonyms
Stereoplasmocerina
Geographic Distribution
Eu. (Norway), Asia (China-Korea-S. Manchuria)
Age Range
Beginning Stage in Treatise Usage:
M.Ord.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Smooth, longiconic orthocones of subcircular section but with somewhat flattened venter, Siphuncle relatively large, subcentral or between center and venter, cyrtochoanitic, empty, or with continuous apparently nonsegmental organic lining, segments moderately to considerably expanded within camerae, Camerae with hyposeptal and episeptal, or with episeptal and mural deposits invariably well developed