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Sphenodiscus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Sphenodiscidae
Formal Genus Name and Reference:
Sphenodiscus MEEK, 1871b, p. 298
Type Species:
Ammonites lobatus Tuomer, 1856, p. 168, OD, =Ammonites lenticularis Owen, 1852, p. 579, non G. M. Young & BIRD, 1828, p. 269, fig. 5
Images
(Click to enlarge in a new window)
Fig. 159, 4a, b. *S. lobatus (Tuomey), Mississippi, X 0.4 (Hyatt, 1903).
Synonyms
Ammonites lobatus, Ammonites lenticularis
Geographic Distribution
The Netherlands, France, Poland, Israel, Jordan, Saudi Arabia, Madagascar, southern India, USA, Mexico, Venezuela
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Campanian)
Beginning International Stage:
Campanian
Fraction Up In Beginning Stage:
50
Beginning Date:
77.91
Ending Stage in Treatise Usage:
Upper Cretaceous (Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Generally smooth, involute, and compressed, tending to be oxyconic, some species with weak lateral and ventrolateral tubercles
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Sphenodiscidae
Formal Genus Name and Reference:
Sphenodiscus MEEK, 1871b, p. 298
Type Species:
Ammonites lobatus Tuomer, 1856, p. 168, OD, =Ammonites lenticularis Owen, 1852, p. 579, non G. M. Young & BIRD, 1828, p. 269, fig. 5
Images
(Click to enlarge in a new window)
Fig. 159, 4a, b. *S. lobatus (Tuomey), Mississippi, X 0.4 (Hyatt, 1903).
Synonyms
Ammonites lobatus, Ammonites lenticularis
Geographic Distribution
The Netherlands, France, Poland, Israel, Jordan, Saudi Arabia, Madagascar, southern India, USA, Mexico, Venezuela
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Campanian)
Beginning International Stage:
Campanian
Fraction Up In Beginning Stage:
50
Beginning Date:
77.91
Ending Stage in Treatise Usage:
Upper Cretaceous (Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Generally smooth, involute, and compressed, tending to be oxyconic, some species with weak lateral and ventrolateral tubercles