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Casteroceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Superfamily:
Tainocerataceae
Family:
Rutoceratidae
Formal Genus Name and Reference:
Casteroceras FLOWER, 1936
Type Species:
Cyrtoceras alternatum Hall, 1879 (nom. subst. pro C. undulatum Hall, 1876, non VANUXEM, 1842), OD
Images
(Click to enlarge in a new window)
Fig. 299, 5. *C. alternatum (Hall), Dev., USA (N.Y.), 5a,b, x0.4 (223)
Synonyms
Geographic Distribution
N. Am. (USA-Can.)-Eu. (Eng.)
Age Range
Beginning Stage in Treatise Usage:
M. Dev.
Beginning International Stage:
Eifelian
Fraction Up In Beginning Stage:
0
Beginning Date:
394.3
Ending Stage in Treatise Usage:
M. Dev.
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Slender, cyrtoconic, with slight curvature which is greater adapically than adaperturally, cross section slightly depressed, exterior divided distinctly into 10 faces in the type-species, though number may vary, internal molds preserving ventral face, but preservation of other faces varying within species, suture slightly sinuous, with narrow dorsal saddle, broad ventral saddle separated by lateral lobes, septa uniformly and very slightly curved, siphuncle close to ventral wall, narrow, orthochoanitic, test thick, bearing irregular transverse undulating lirae, which are crossed by a few coarse, large, poorly defined longitudinal lirae, at intervals of about every other camera interior bears ring of nodose expansions (one under each lira), above which lirae are projected into short spines, nodes decreasing adorally, shallow hyponomic sinus present
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Superfamily:
Tainocerataceae
Family:
Rutoceratidae
Formal Genus Name and Reference:
Casteroceras FLOWER, 1936
Type Species:
Cyrtoceras alternatum Hall, 1879 (nom. subst. pro C. undulatum Hall, 1876, non VANUXEM, 1842), OD
Images
(Click to enlarge in a new window)
Fig. 299, 5. *C. alternatum (Hall), Dev., USA (N.Y.), 5a,b, x0.4 (223)
Synonyms
Geographic Distribution
N. Am. (USA-Can.)-Eu. (Eng.)
Age Range
Beginning Stage in Treatise Usage:
M. Dev.
Beginning International Stage:
Eifelian
Fraction Up In Beginning Stage:
0
Beginning Date:
394.3
Ending Stage in Treatise Usage:
M. Dev.
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Slender, cyrtoconic, with slight curvature which is greater adapically than adaperturally, cross section slightly depressed, exterior divided distinctly into 10 faces in the type-species, though number may vary, internal molds preserving ventral face, but preservation of other faces varying within species, suture slightly sinuous, with narrow dorsal saddle, broad ventral saddle separated by lateral lobes, septa uniformly and very slightly curved, siphuncle close to ventral wall, narrow, orthochoanitic, test thick, bearing irregular transverse undulating lirae, which are crossed by a few coarse, large, poorly defined longitudinal lirae, at intervals of about every other camera interior bears ring of nodose expansions (one under each lira), above which lirae are projected into short spines, nodes decreasing adorally, shallow hyponomic sinus present