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Witchellia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Sonniniidae
Formal Genus Name and Reference:
Witchellia BUCKMAN, 1889
Type Species:
Am. laeviusculus J. DEC.SOWERBY, 1824
Images
(Click to enlarge in a new window)
Fig. 311,7. *W. laeviuscula (Sow.), Eng.; 7a,b, X0.7 (65°)
Synonyms
Zugophorites, Sonninites, Gelasinites, Dundryites, Rubrileiites, Anolkoleiites, Zugella
Geographic Distribution
Eu.-N.Afr.-Cauc.-Persia-Tibet- W.Austral.-Can.-Ore.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Baj.
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
33
Beginning Date:
170
Ending Stage in Treatise Usage:
M.Baj.
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
66
Ending Date:
169.1
Description
Inclined to be involute and compressed, whorls heightening and smoothing early, long before septation ceases, venter narrow tabulate and carinate, commonly bisulcate, even tricarinate, or becoming fastigate; nucleus as in Sonninia.
References
Buckman, S. S., 1889, The descent of Sonninia and Hammatoceras: Quart. Jour. Geol. Soc. (London), v. 45, p. 651-663, pl. 22.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Sonniniidae
Formal Genus Name and Reference:
Witchellia BUCKMAN, 1889
Type Species:
Am. laeviusculus J. DEC.SOWERBY, 1824
Images
(Click to enlarge in a new window)
Fig. 311,7. *W. laeviuscula (Sow.), Eng.; 7a,b, X0.7 (65°)
Synonyms
Zugophorites, Sonninites, Gelasinites, Dundryites, Rubrileiites, Anolkoleiites, Zugella
Geographic Distribution
Eu.-N.Afr.-Cauc.-Persia-Tibet- W.Austral.-Can.-Ore.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Baj.
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
33
Beginning Date:
170
Ending Stage in Treatise Usage:
M.Baj.
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
66
Ending Date:
169.1
Description
Inclined to be involute and compressed, whorls heightening and smoothing early, long before septation ceases, venter narrow tabulate and carinate, commonly bisulcate, even tricarinate, or becoming fastigate; nucleus as in Sonninia.
References
Buckman, S. S., 1889, The descent of Sonninia and Hammatoceras: Quart. Jour. Geol. Soc. (London), v. 45, p. 651-663, pl. 22.