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Richardsonoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Oncocerida
Family:
Oncoceratidae
Formal Genus Name and Reference:
Richardsonoceras FOERSTE, 1932, p. 50
Type Species:
Cyrtoceras simplex BILLINGS, 1857, p. 313, OD
Images
(Click to enlarge in a new window)
Fig. 201, 1. *R. simplex (Billings), M.Ord., Can. (Ont.), 1a,b, ventral, lat. (venter left), x1 (71).
Synonyms
Geographic Distribution
N.Am.
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:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Gradually enlarging cyrtocones like Beloitoceras, but not gibbous adorally, body chamber not contracted adorally, siphuncle somewhat larger than that of Beloitoceras. [Only superficially distinct from Oonoceras.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Oncocerida
Family:
Oncoceratidae
Formal Genus Name and Reference:
Richardsonoceras FOERSTE, 1932, p. 50
Type Species:
Cyrtoceras simplex BILLINGS, 1857, p. 313, OD
Images
(Click to enlarge in a new window)
Fig. 201, 1. *R. simplex (Billings), M.Ord., Can. (Ont.), 1a,b, ventral, lat. (venter left), x1 (71).
Synonyms
Geographic Distribution
N.Am.
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:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Gradually enlarging cyrtocones like Beloitoceras, but not gibbous adorally, body chamber not contracted adorally, siphuncle somewhat larger than that of Beloitoceras. [Only superficially distinct from Oonoceras.]