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Endoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Endoceratoidea
Order:
Endocerida
Family:
Endoceratidae
Subfamily:
Genera known from fragmentary conchs, including siphuncles, with apical end and body chamber usually known or poorly known
Formal Genus Name and Reference:
Endoceras HALL, 1847
Type Species:
E. annulatum Hall, 1847, SD S. A. MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. 112,2. E. abundum (MILLER), M.Ord., USA(Wyo.) ; 2a, ventral view, X0.6; 2b,c, transv. and long secs., X0.6 (226).
Synonyms
Cyclendoceras, Andoceras
Geographic Distribution
N. Am.-USSR (Sib.)-E.Asia-N.Eu.
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
Conchs large, straight, similar to Cameroceras, but with annulations varying from low and closely spaced to well elevated and distinctly apart, cross section slightly depressed, sutures straight, transverse. Siphuncle large, ventral, holochoanitic, endocones subcircular in cross section, thin endosiphuncular tube, apical part unknown.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Endoceratoidea
Order:
Endocerida
Family:
Endoceratidae
Subfamily:
Genera known from fragmentary conchs, including siphuncles, with apical end and body chamber usually known or poorly known
Formal Genus Name and Reference:
Endoceras HALL, 1847
Type Species:
E. annulatum Hall, 1847, SD S. A. MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. 112,2. E. abundum (MILLER), M.Ord., USA(Wyo.) ; 2a, ventral view, X0.6; 2b,c, transv. and long secs., X0.6 (226).
Synonyms
Cyclendoceras, Andoceras
Geographic Distribution
N. Am.-USSR (Sib.)-E.Asia-N.Eu.
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
Conchs large, straight, similar to Cameroceras, but with annulations varying from low and closely spaced to well elevated and distinctly apart, cross section slightly depressed, sutures straight, transverse. Siphuncle large, ventral, holochoanitic, endocones subcircular in cross section, thin endosiphuncular tube, apical part unknown.