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Choristoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ceratitida
Superfamily:
Clydonitaceae
Family:
Choristoceratidae
Formal Genus Name and Reference:
Choristoceras HAUER, 1865
Type Species:
C. marshi
Images
(Click to enlarge in a new window)
Fig. 199,5. *C. marshi, Rhaet., Alps, 5a,b, X 1 (292*).
Synonyms
Geographic Distribution
Alps, Timor, British Columbia (B.C.), California (Calif.), Nevada (Nev.)
Age Range
Beginning Stage in Treatise Usage:
Carn.
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Rhaet.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Very evolute, outer whorl tending to uncoil, whorl section subquadrate, sides with strong radial ribs that may cross shallow ventral furrow, generally tubercles on ribs at ventrolateral area. Suture goniatitic to simple ceratitic
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ceratitida
Superfamily:
Clydonitaceae
Family:
Choristoceratidae
Formal Genus Name and Reference:
Choristoceras HAUER, 1865
Type Species:
C. marshi
Images
(Click to enlarge in a new window)
Fig. 199,5. *C. marshi, Rhaet., Alps, 5a,b, X 1 (292*).
Synonyms
Geographic Distribution
Alps, Timor, British Columbia (B.C.), California (Calif.), Nevada (Nev.)
Age Range
Beginning Stage in Treatise Usage:
Carn.
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Rhaet.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Very evolute, outer whorl tending to uncoil, whorl section subquadrate, sides with strong radial ribs that may cross shallow ventral furrow, generally tubercles on ribs at ventrolateral area. Suture goniatitic to simple ceratitic