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Kirkoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Endoceratoidea
Order:
Endocerida
Family:
Proterocameroceratidae
Subfamily:
Genera known from fragmentary siphuncles only, represented by parts filled with endocones, believed to belong to the Proterocameroceratiidae
Formal Genus Name and Reference:
Kirkoceras Ulrich & FOERSTE, 1936
Type Species:
K. arcuatum, OD
Images
(Click to enlarge in a new window)
Fig. 108, 2. *K. arcuatum, 2a-c, lat., dorsal, ventral views, x0.7 (201).
Synonyms
Clitendoceras
Geographic Distribution
USA (Colo.)
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (U.Canad.)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
L.Ord. (U.Canad.)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Large, distinctly curved siphuncles with circular to compressed cross section, rapidly enlarging in early stages, contracting adaperturally. Surface of siphuncle obliquely annulated, suggesting that septal necks (or connecting rings) were slightly convex inward.
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:
Endoceratoidea
Order:
Endocerida
Family:
Proterocameroceratidae
Subfamily:
Genera known from fragmentary siphuncles only, represented by parts filled with endocones, believed to belong to the Proterocameroceratiidae
Formal Genus Name and Reference:
Kirkoceras Ulrich & FOERSTE, 1936
Type Species:
K. arcuatum, OD
Images
(Click to enlarge in a new window)
Fig. 108, 2. *K. arcuatum, 2a-c, lat., dorsal, ventral views, x0.7 (201).
Synonyms
Clitendoceras
Geographic Distribution
USA (Colo.)
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (U.Canad.)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
L.Ord. (U.Canad.)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Large, distinctly curved siphuncles with circular to compressed cross section, rapidly enlarging in early stages, contracting adaperturally. Surface of siphuncle obliquely annulated, suggesting that septal necks (or connecting rings) were slightly convex inward.
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.