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Shirbuirnia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ammonitina
Superfamily:
Hildocerataceae
Family:
Sonniniidae
Formal Genus Name and Reference:
Shirbuirnia BUCKMAN, 1910
Type Species:
S. trigonalis BUCK.; SD ARKELL, 1954
Images
(Click to enlarge in a new window)
Fig. 311,9. °S. trigonalis, Eng.; 9a,b, X0.15; 9c, X0.3 (595°)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
M.Baj.(sowerbyi z.)
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
33
Beginning Date:
170
Ending Stage in Treatise Usage:
M.Baj.(sowerbyi z.)
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
66
Ending Date:
169.1
Description
Large, smooth, more or less involute: nucleus as in Sonninia; venter becomes rounded on body chamber with degeneration of keel. Sutures simple.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ammonitina
Superfamily:
Hildocerataceae
Family:
Sonniniidae
Formal Genus Name and Reference:
Shirbuirnia BUCKMAN, 1910
Type Species:
S. trigonalis BUCK.; SD ARKELL, 1954
Images
(Click to enlarge in a new window)
Fig. 311,9. °S. trigonalis, Eng.; 9a,b, X0.15; 9c, X0.3 (595°)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
M.Baj.(sowerbyi z.)
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
33
Beginning Date:
170
Ending Stage in Treatise Usage:
M.Baj.(sowerbyi z.)
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
66
Ending Date:
169.1
Description
Large, smooth, more or less involute: nucleus as in Sonninia; venter becomes rounded on body chamber with degeneration of keel. Sutures simple.