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Lambeoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Gonioceratidae
Formal Genus Name and Reference:
Lambeoceras FOERSTE, 1917
Type Species:
Gonioceras lambii WHITEAVES, 1891; OD (=G. lambei of later authors)
Images
(Click to enlarge in a new window)
Fig. 148,2a. •L. lambii (WHITEAVES), M. (or IV.) Ord., Can. (Man.); dorsal view of conch, X0.1 (118). -- FIG. 148,2b-e. L. princeps TROEDSSON, M.(or IV) Ord., N.Green!.; 2b, ventral view of conch, XO.l8; 2c, transv. sec., XO.3; 2d, siphuncle, dorsoventral sec., X1; 2e, detail of septal neck (s, septum; k, brim; sr, circulus; sh, connecting ring; p, perispatium; pa, perispatial deposit), X8 (2b,c, 194; 2d,e, 236)
Synonyms
Hoeloceras
Geographic Distribution
N.Am.Green!. - NE. Eu. - Sib.
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
Large to . very large shells, both flat sides evenly and gently convex; sutures with broad sinus across ventral and dorsal sides and acute lateral saddles. Siphuncle subventral ; segments either like Gonioceras or with more prolonged constricted part where septa bend backward behind septal foramen; brims strongly recurved, pointing forward and outward; endosiphuncular canal system simple, known from all species except type-species. [Genus originally proposed as subgenus of Tripteroceras HYATT, 1884.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Gonioceratidae
Formal Genus Name and Reference:
Lambeoceras FOERSTE, 1917
Type Species:
Gonioceras lambii WHITEAVES, 1891; OD (=G. lambei of later authors)
Images
(Click to enlarge in a new window)
Fig. 148,2a. •L. lambii (WHITEAVES), M. (or IV.) Ord., Can. (Man.); dorsal view of conch, X0.1 (118). -- FIG. 148,2b-e. L. princeps TROEDSSON, M.(or IV) Ord., N.Green!.; 2b, ventral view of conch, XO.l8; 2c, transv. sec., XO.3; 2d, siphuncle, dorsoventral sec., X1; 2e, detail of septal neck (s, septum; k, brim; sr, circulus; sh, connecting ring; p, perispatium; pa, perispatial deposit), X8 (2b,c, 194; 2d,e, 236)
Synonyms
Hoeloceras
Geographic Distribution
N.Am.Green!. - NE. Eu. - Sib.
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
Large to . very large shells, both flat sides evenly and gently convex; sutures with broad sinus across ventral and dorsal sides and acute lateral saddles. Siphuncle subventral ; segments either like Gonioceras or with more prolonged constricted part where septa bend backward behind septal foramen; brims strongly recurved, pointing forward and outward; endosiphuncular canal system simple, known from all species except type-species. [Genus originally proposed as subgenus of Tripteroceras HYATT, 1884.]