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Pachydiscus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Pachydiscidae
Formal Genus Name and Reference:
Pachydiscus ZITTEL, 1884, p. 466
Type Species:
Ammonites neubergicus Hauer, 1858, p. 12, SD Grossouvre, 1894, p. 177, ICZN Opinion 1519, 1989 (given precedence over Ammonites chrishna FORBES, 1846, p. 103)
Images
(Click to enlarge in a new window)
Fig. 77, 1a-c. P. (P.) compressus Spath, Campanian, southern India, × 0.75 (Kossmat, 1895-1898)
Synonyms
Parapachydiscus, Joaquinites
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Campanian)
Beginning International Stage:
Campanian
Fraction Up In Beginning Stage:
0
Beginning Date:
83.65
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Compressed, high-whorled, with flat or convex sides, ribs tending to differentiate into short umbilicals and separate ventrolaterals, the latter tending to be interrupted on venter or to disappear
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Pachydiscidae
Formal Genus Name and Reference:
Pachydiscus ZITTEL, 1884, p. 466
Type Species:
Ammonites neubergicus Hauer, 1858, p. 12, SD Grossouvre, 1894, p. 177, ICZN Opinion 1519, 1989 (given precedence over Ammonites chrishna FORBES, 1846, p. 103)
Images
(Click to enlarge in a new window)
Fig. 77, 1a-c. P. (P.) compressus Spath, Campanian, southern India, × 0.75 (Kossmat, 1895-1898)
Synonyms
Parapachydiscus, Joaquinites
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Campanian)
Beginning International Stage:
Campanian
Fraction Up In Beginning Stage:
0
Beginning Date:
83.65
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Compressed, high-whorled, with flat or convex sides, ribs tending to differentiate into short umbilicals and separate ventrolaterals, the latter tending to be interrupted on venter or to disappear