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Bournonia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Hippuritoida (rudists and relatives)
Superfamily:
Hippuritacea (rudists)
Family:
Radiolitidae
Subfamily:
Biradiolitinae
Formal Genus Name and Reference:
Bournonia Fischer (ex Bayle, MS), 1887, p. 1067
Type Species:
Sphaerulites bournoni des MOULINS, 1826 (1827), p. 271, M
Images
(Click to enlarge in a new window)
Fig. E270,5. *B. bournoni (des Moulins), Maastricht., France (Dordogne), lat. view, X0.4 (251). [Also Fig. E266, 1.]
Synonyms
Geographic Distribution
Eu.-N.Afr.-Asia-W.Indies.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
AV conical, small to very large ornamented by folds and sporadically by collared horns as in Praeradiolites, siphonal bands salient, undulating smooth or ribbed, anterior dorsal fold may project markedly. FV operculiform, convex.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Hippuritoida (rudists and relatives)
Superfamily:
Hippuritacea (rudists)
Family:
Radiolitidae
Subfamily:
Biradiolitinae
Formal Genus Name and Reference:
Bournonia Fischer (ex Bayle, MS), 1887, p. 1067
Type Species:
Sphaerulites bournoni des MOULINS, 1826 (1827), p. 271, M
Images
(Click to enlarge in a new window)
Fig. E270,5. *B. bournoni (des Moulins), Maastricht., France (Dordogne), lat. view, X0.4 (251). [Also Fig. E266, 1.]
Synonyms
Geographic Distribution
Eu.-N.Afr.-Asia-W.Indies.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
AV conical, small to very large ornamented by folds and sporadically by collared horns as in Praeradiolites, siphonal bands salient, undulating smooth or ribbed, anterior dorsal fold may project markedly. FV operculiform, convex.