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Orthoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Orthoceratidae
Subfamily:
Orthoceratinae
Formal Genus Name and Reference:
Orthoceras BRUGUIÈRE, 1789, p. xvi
Type Species:
Orthoceratites regularis Schlotheim, 1820, SD Miller, Dunbar & CONDRA, 1933
Images
(Click to enlarge in a new window)
Fig. 153, 1. *o. regulare (Schlotheim), Est., 1a, long. sec. through siphuncle, x1, 1b, right lat. view of body chamber, x0.5 (195).
Synonyms
Ortaoceras
Geographic Distribution
Eu. (Est.-Lith.-USSR-Sweden)
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
Slightly expanding, almost cylindrical orthocones or faintly exogastric cyrtocones with empty, subcentral to slightly ventral cylindrical orthochoanitic siphuncle. Body chamber transversely constricted at mid-length and marked by single longitudinal dorsal and 2 longitudinal ventral depressions. Surface ornamented by a network of fine lirae; internal surface faintly striated longitudinally, with prominent concha! furrow on venter; muscle attachment dorsomyarian.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Orthoceratidae
Subfamily:
Orthoceratinae
Formal Genus Name and Reference:
Orthoceras BRUGUIÈRE, 1789, p. xvi
Type Species:
Orthoceratites regularis Schlotheim, 1820, SD Miller, Dunbar & CONDRA, 1933
Images
(Click to enlarge in a new window)
Fig. 153, 1. *o. regulare (Schlotheim), Est., 1a, long. sec. through siphuncle, x1, 1b, right lat. view of body chamber, x0.5 (195).
Synonyms
Ortaoceras
Geographic Distribution
Eu. (Est.-Lith.-USSR-Sweden)
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
Slightly expanding, almost cylindrical orthocones or faintly exogastric cyrtocones with empty, subcentral to slightly ventral cylindrical orthochoanitic siphuncle. Body chamber transversely constricted at mid-length and marked by single longitudinal dorsal and 2 longitudinal ventral depressions. Surface ornamented by a network of fine lirae; internal surface faintly striated longitudinally, with prominent concha! furrow on venter; muscle attachment dorsomyarian.