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Dorsetensia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Sonniniidae
Formal Genus Name and Reference:
Dorsetensia BUCKMAN, 1892
Type Species:
Am. edouardianus D'ORBIGNY, 1846
Images
(Click to enlarge in a new window)
Fig. 311,10. *D. edouardiana (Orb.), Fr., 10a,b, x1 (330*)
Synonyms
Hyalinites
Geographic Distribution
Eu.-N. Afr.-Kenya-Madag.-C. Arabia - Pamirs - Tibet
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
Nucleus ribbed or smooth, outer whorls smooth, compressed, with narrow sharp-keeled venter, umbilical edge sharp, sometimes undercut
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Sonniniidae
Formal Genus Name and Reference:
Dorsetensia BUCKMAN, 1892
Type Species:
Am. edouardianus D'ORBIGNY, 1846
Images
(Click to enlarge in a new window)
Fig. 311,10. *D. edouardiana (Orb.), Fr., 10a,b, x1 (330*)
Synonyms
Hyalinites
Geographic Distribution
Eu.-N. Afr.-Kenya-Madag.-C. Arabia - Pamirs - Tibet
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
Nucleus ribbed or smooth, outer whorls smooth, compressed, with narrow sharp-keeled venter, umbilical edge sharp, sometimes undercut