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Ordosoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Polydesmiidae
Formal Genus Name and Reference:
Ordosoceras CHANG, 1959
Type Species:
O. sphaeriforme, OD
Images
(Click to enlarge in a new window)
Fig. 140, 2. O. sphaeriforme otoktiensis, 2a, long. sec. of shell (orientation unknown), x0.7; 2b, long. sec. (orientation unknown, drawn from photograph), x1.3; 2c, transv. sec. (outer line=shell, middle line=siphuncular segment, inner line = septal foramen), x0.7 (219).
Synonyms
Geographic Distribution
Inner Mongolia
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
Similar to Polydesmia in general dimensions of conch and siphuncle, but siphuncular segments inflated in mid-portion of camerae, inflated part of connecting rings not in contact with either anterior or posterior septa, episeptal and hyposeptal deposits strongly developed in camerae, endosiphuncular canal system reticulate, structure of septal necks not well known
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Polydesmiidae
Formal Genus Name and Reference:
Ordosoceras CHANG, 1959
Type Species:
O. sphaeriforme, OD
Images
(Click to enlarge in a new window)
Fig. 140, 2. O. sphaeriforme otoktiensis, 2a, long. sec. of shell (orientation unknown), x0.7; 2b, long. sec. (orientation unknown, drawn from photograph), x1.3; 2c, transv. sec. (outer line=shell, middle line=siphuncular segment, inner line = septal foramen), x0.7 (219).
Synonyms
Geographic Distribution
Inner Mongolia
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
Similar to Polydesmia in general dimensions of conch and siphuncle, but siphuncular segments inflated in mid-portion of camerae, inflated part of connecting rings not in contact with either anterior or posterior septa, episeptal and hyposeptal deposits strongly developed in camerae, endosiphuncular canal system reticulate, structure of septal necks not well known