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Diestoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Oncocerida
Family:
Diestoceratidae
Formal Genus Name and Reference:
Diestoceras FOERSTE, 1924, p. 262
Type Species:
Gomphoceras indianense Miller & FABER, 1894, p. 137, OD
Images
(Click to enlarge in a new window)
Fig. 208, 5. *D. indianense (Miller & Faber), U. Ord., USA (Ind.), 5a,b, lat. (venter right), ventral, x0.5; 5c, partial long. sec. (venter left), x2
Synonyms
Geographic Distribution
N.Am.-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
Conch with greatest height and width at adoral end of phragmocone, contracting to aperture, peristome straight, transverse, with hyponomic sinus. Siphuncle ventral, cyrtochoanitic, segments subquadrate in longitudinal section, usually scalariform in outline, thin annulosiphonate rings in septal foramen produce distinctive irregular linear processes extending adapically and adorally, but not forming rays continuous from segment to segment
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Oncocerida
Family:
Diestoceratidae
Formal Genus Name and Reference:
Diestoceras FOERSTE, 1924, p. 262
Type Species:
Gomphoceras indianense Miller & FABER, 1894, p. 137, OD
Images
(Click to enlarge in a new window)
Fig. 208, 5. *D. indianense (Miller & Faber), U. Ord., USA (Ind.), 5a,b, lat. (venter right), ventral, x0.5; 5c, partial long. sec. (venter left), x2
Synonyms
Geographic Distribution
N.Am.-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
Conch with greatest height and width at adoral end of phragmocone, contracting to aperture, peristome straight, transverse, with hyponomic sinus. Siphuncle ventral, cyrtochoanitic, segments subquadrate in longitudinal section, usually scalariform in outline, thin annulosiphonate rings in septal foramen produce distinctive irregular linear processes extending adapically and adorally, but not forming rays continuous from segment to segment