Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Discoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Tarphycerida
Family:
Trocholitidae
Formal Genus Name and Reference:
Discoceras BARRANDE, 1867, p. 177
Type Species:
Clymenia antiquissima Eichwald, 1842, p. 33, SD SCHRÖDER, 1891, p. 159
Images
(Click to enlarge in a new window)
Figs. 256,3b, 260,2. *D. antiquissimum (ЕICHwald), M.Ord., Eu. (Baltic), lat. view, cross sec., x1.7 (219a, 176). -- Fig. 259, 4. D. angulatum (Saemann), U.Ord. (Ashgill.), Eu. (Norway), holotype, whorl sec., x1.3 (203). -- Fig. 256, 3a. D. boreale Sweet, M.Ord., Eu. (Norway), thin sec., x2.5 (178).
Synonyms
Schroederoceras, Eurasiaticoceras
Geographic Distribution
Eu. (Balto-Scandia), Can. (Baffin Is.), China (Yunnan-Hopeh Prov.), India (Punjab)
Age Range
Beginning Stage in Treatise Usage:
M.Ord. (Llandeil.)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
56.9
Beginning Date:
463.02
Ending Stage in Treatise Usage:
U.Ord. (Ashgill.)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Gradually expanded ribbed or smooth forms characterized by slight to moderate impression and subquadrate whorl section, siphuncle central in initial half-volution, marginodorsal in succeeding 1.5 to 2 whorls, subdorsal at maturity, connecting rings thick, layered
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Tarphycerida
Family:
Trocholitidae
Formal Genus Name and Reference:
Discoceras BARRANDE, 1867, p. 177
Type Species:
Clymenia antiquissima Eichwald, 1842, p. 33, SD SCHRÖDER, 1891, p. 159
Images
(Click to enlarge in a new window)
Figs. 256,3b, 260,2. *D. antiquissimum (ЕICHwald), M.Ord., Eu. (Baltic), lat. view, cross sec., x1.7 (219a, 176). -- Fig. 259, 4. D. angulatum (Saemann), U.Ord. (Ashgill.), Eu. (Norway), holotype, whorl sec., x1.3 (203). -- Fig. 256, 3a. D. boreale Sweet, M.Ord., Eu. (Norway), thin sec., x2.5 (178).
Synonyms
Schroederoceras, Eurasiaticoceras
Geographic Distribution
Eu. (Balto-Scandia), Can. (Baffin Is.), China (Yunnan-Hopeh Prov.), India (Punjab)
Age Range
Beginning Stage in Treatise Usage:
M.Ord. (Llandeil.)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
56.9
Beginning Date:
463.02
Ending Stage in Treatise Usage:
U.Ord. (Ashgill.)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Gradually expanded ribbed or smooth forms characterized by slight to moderate impression and subquadrate whorl section, siphuncle central in initial half-volution, marginodorsal in succeeding 1.5 to 2 whorls, subdorsal at maturity, connecting rings thick, layered