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Walcottoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Ellesmerocerida
Family:
Protocycloceratidae
Formal Genus Name and Reference:
Walcottoceras Ulrich & FOERSTE, 1936, p. 289
Type Species:
Endoceras (?) monsensis WALCOTT, 1924, p. 529, OD
Images
(Click to enlarge in a new window)
Fig. 87, 2a-d. W. obliquum Ulrich, Foerste, Miller & Unklesbay, L. Ord. (L. Canad.), USA (Iowa), 2a,c,d, lat. views, x1.5, 2b, septal view, x3 (204). -- Fig. 87, 2e,f. *W. monsense (Wal- cort), L.Ord. (L.Canad.), Can. (Alba.), holotype, lat. and ventral views, x1.5 (204)
Synonyms
Geographic Distribution
N.Am. (widespread)
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (L.Canad.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord. (L.Canad., ?U. Canad.)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Strongly annulate compressed longicones, orthoconic to gently curved endogastrically, sutures form broadly rounded lateral lobe, siphuncle submarginal, about 1/8 of dorsoventral conch diameter, cylindrical
References
Foerste, A. F., 1936, Silurian cephalopods of the Port Daniel area on Gaspé Peninsula, in eastern Canada: Denison Univ. Bull., Jour. Sci. Lab., v. 36, p. 21-92, pl. 1-22.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Ellesmerocerida
Family:
Protocycloceratidae
Formal Genus Name and Reference:
Walcottoceras Ulrich & FOERSTE, 1936, p. 289
Type Species:
Endoceras (?) monsensis WALCOTT, 1924, p. 529, OD
Images
(Click to enlarge in a new window)
Fig. 87, 2a-d. W. obliquum Ulrich, Foerste, Miller & Unklesbay, L. Ord. (L. Canad.), USA (Iowa), 2a,c,d, lat. views, x1.5, 2b, septal view, x3 (204). -- Fig. 87, 2e,f. *W. monsense (Wal- cort), L.Ord. (L.Canad.), Can. (Alba.), holotype, lat. and ventral views, x1.5 (204)
Synonyms
Geographic Distribution
N.Am. (widespread)
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (L.Canad.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord. (L.Canad., ?U. Canad.)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Strongly annulate compressed longicones, orthoconic to gently curved endogastrically, sutures form broadly rounded lateral lobe, siphuncle submarginal, about 1/8 of dorsoventral conch diameter, cylindrical
References
Foerste, A. F., 1936, Silurian cephalopods of the Port Daniel area on Gaspé Peninsula, in eastern Canada: Denison Univ. Bull., Jour. Sci. Lab., v. 36, p. 21-92, pl. 1-22.