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Ormoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Ormoceratidae
Formal Genus Name and Reference:
Ormoceras STOKES, 1840
Type Species:
O. bayfieldi, SD BASSLER, 1915
Images
(Click to enlarge in a new window)
Fig. 150,1a. O. allumettense (BILLINGS), M.Ord., Can. (Que.); ventral view of weathered conch showing siphuncle, X0.7 (71). -- Fig. 150,1b. O. billingsi (FLOWER), M.Ord., Can.(Newf.); dorsoventral sec., X0.7 (l85). -- Fig. 150,1e,d. O. holmi TROEDSSON, M.Ord., Sweden; 1e, dorsoventral sec., X0.7; 1d, detail of septal neck (se, septum; sh, connecting ring; fu, septal neck; ch, camera; si, central canal; ea, radial canals), X2.7 (194)
Synonyms
Ormoceratites, Hormoceras, Sactoceras, Aluveroceras, Adamsoceras
Geographic Distribution
cosmop.
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:
Dev., ?L.Carb.
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Medium-sized, straight shells, more or less circular in cross section, Siphuncle generally subcentral, segments almost globular, septal necks short, actinoceroid, with short brims, endosiphuncular canal system moderately complex to simple, radial canals few, Cameral deposits common
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Ormoceratidae
Formal Genus Name and Reference:
Ormoceras STOKES, 1840
Type Species:
O. bayfieldi, SD BASSLER, 1915
Images
(Click to enlarge in a new window)
Fig. 150,1a. O. allumettense (BILLINGS), M.Ord., Can. (Que.); ventral view of weathered conch showing siphuncle, X0.7 (71). -- Fig. 150,1b. O. billingsi (FLOWER), M.Ord., Can.(Newf.); dorsoventral sec., X0.7 (l85). -- Fig. 150,1e,d. O. holmi TROEDSSON, M.Ord., Sweden; 1e, dorsoventral sec., X0.7; 1d, detail of septal neck (se, septum; sh, connecting ring; fu, septal neck; ch, camera; si, central canal; ea, radial canals), X2.7 (194)
Synonyms
Ormoceratites, Hormoceras, Sactoceras, Aluveroceras, Adamsoceras
Geographic Distribution
cosmop.
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:
Dev., ?L.Carb.
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Medium-sized, straight shells, more or less circular in cross section, Siphuncle generally subcentral, segments almost globular, septal necks short, actinoceroid, with short brims, endosiphuncular canal system moderately complex to simple, radial canals few, Cameral deposits common