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Gymnotoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ceratitina
Superfamily:
Ceratitaceae
Family:
Beyrichitidae
Formal Genus Name and Reference:
Gymnotoceras HYATT, 1877
Type Species:
Am. blakei GABB, 1864
Images
(Click to enlarge in a new window)
Fig. 182,1. *G. blakei, Nev., 1a,b, x0.7, 1 c, X1.5 (449*)
Synonyms
Geographic Distribution
Spitz.-Japan- ?Himalaya-B.C.-Nev.
Age Range
Beginning Stage in Treatise Usage:
M.Trias.(Anis.)
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
M.Trias.(Anis.)
Ending International Stage:
Anisian
Fraction Up In Ending Stage:
100
Ending Date:
241.46
Description
Venter subtabulate to subcarinate, whorl sides with strong sigmoidal ribs, single or bifurcating. Suture subceratitic
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ceratitina
Superfamily:
Ceratitaceae
Family:
Beyrichitidae
Formal Genus Name and Reference:
Gymnotoceras HYATT, 1877
Type Species:
Am. blakei GABB, 1864
Images
(Click to enlarge in a new window)
Fig. 182,1. *G. blakei, Nev., 1a,b, x0.7, 1 c, X1.5 (449*)
Synonyms
Geographic Distribution
Spitz.-Japan- ?Himalaya-B.C.-Nev.
Age Range
Beginning Stage in Treatise Usage:
M.Trias.(Anis.)
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
M.Trias.(Anis.)
Ending International Stage:
Anisian
Fraction Up In Ending Stage:
100
Ending Date:
241.46
Description
Venter subtabulate to subcarinate, whorl sides with strong sigmoidal ribs, single or bifurcating. Suture subceratitic