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Dichotomoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Dichotomoceras BUCKMAN, 1919 [Subgen. of Perisphinctes.]
Type Species:
D. dichotomum
Images
(Click to enlarge in a new window)
Fig. 411,1. *P. (D.) dichotomus (BUCK.), Eng.; la,b, X0.3
(6*)
Synonyms
Geographic Distribution
Eu.-S. Russia-Abys.-Kenya-Cutch-Japan
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(U.Oxf.), ?L.Kimm.
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
50
Beginning Date:
158.16
Ending Stage in Treatise Usage:
U.Jur.(U.Oxf.), ?L.Kimm.
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
50
Ending Date:
152.01
Description
Doubtfully distinct from Orthosphinctes, ribs sharper, more distant, no constrictions. [Subgen. of Perisphinctes.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Dichotomoceras BUCKMAN, 1919 [Subgen. of Perisphinctes.]
Type Species:
D. dichotomum
Images
(Click to enlarge in a new window)
Fig. 411,1. *P. (D.) dichotomus (BUCK.), Eng.; la,b, X0.3
(6*)
Synonyms
Geographic Distribution
Eu.-S. Russia-Abys.-Kenya-Cutch-Japan
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(U.Oxf.), ?L.Kimm.
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
50
Beginning Date:
158.16
Ending Stage in Treatise Usage:
U.Jur.(U.Oxf.), ?L.Kimm.
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
50
Ending Date:
152.01
Description
Doubtfully distinct from Orthosphinctes, ribs sharper, more distant, no constrictions. [Subgen. of Perisphinctes.]