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Lithacoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Lithacoceras HYATT, 1900
Type Species:
Am. ulmensis OPPEL, 1858
Images
(Click to enlarge in a new window)
Fig. 413,3. *L. ulmense (Oppel), Solnhofen sl., Ger., neotype, X 0.25 (429*)
Synonyms
Geographic Distribution
Eu., Kenya, Madag., Cauc., Cutch, Japan, ?Spitz., P.Arg.
Age Range
Beginning Stage in Treatise Usage:
L. Kimm.
Beginning International Stage:
Kimmeridgian
Fraction Up In Beginning Stage:
0
Beginning Date:
154.78
Ending Stage in Treatise Usage:
M. Kimm.
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
66
Ending Date:
151.12
Description
Large, involute, compressed, constricted, densely covered with fine, sharp ribbing, which is biplicate and triplicate on inner and middle whorls, as in Discosphinctes, but becomes distant and fasciculate on outer whorl, with up to 8 secondaries per primary and a tendency to become virgatotome
References
Hyatt, Alpheus, 1900, Cephalopoda: in Zittel, K. A., Textbook of Palaeontology, 1st English ed., transl. Eastman, C. R., p. 502-592, fig. 1049-1235.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Lithacoceras HYATT, 1900
Type Species:
Am. ulmensis OPPEL, 1858
Images
(Click to enlarge in a new window)
Fig. 413,3. *L. ulmense (Oppel), Solnhofen sl., Ger., neotype, X 0.25 (429*)
Synonyms
Geographic Distribution
Eu., Kenya, Madag., Cauc., Cutch, Japan, ?Spitz., P.Arg.
Age Range
Beginning Stage in Treatise Usage:
L. Kimm.
Beginning International Stage:
Kimmeridgian
Fraction Up In Beginning Stage:
0
Beginning Date:
154.78
Ending Stage in Treatise Usage:
M. Kimm.
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
66
Ending Date:
151.12
Description
Large, involute, compressed, constricted, densely covered with fine, sharp ribbing, which is biplicate and triplicate on inner and middle whorls, as in Discosphinctes, but becomes distant and fasciculate on outer whorl, with up to 8 secondaries per primary and a tendency to become virgatotome
References
Hyatt, Alpheus, 1900, Cephalopoda: in Zittel, K. A., Textbook of Palaeontology, 1st English ed., transl. Eastman, C. R., p. 502-592, fig. 1049-1235.