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Anagaudryceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Tetragonitaceae
Family:
Gaudryceratidae
Formal Genus Name and Reference:
Anagaudryceras SHIMIZU, 1934, p. 67
Type Species:
Ammonites sacya FORBES, 1846, p. 113, OD
Images
(Click to enlarge in a new window)
Fig. 1, 4 a-d . * A. sacya (Forbes), Upper Albian or Cenomanian, southeastern India (Verdachellum), a, b, holotype, BMNH C.51067, X 1 (new), c, d, holotype of Ammonites buddha Forbes, BMNH C.22673, X0.7 (new)"
Synonyms
Paragaudryceras, Murphyella Matsumoto
Geographic Distribution
England, France, Germany, Austria, Romania, Algeria, Angola, South Africa (Zululand), Madagascar, southeastern India, Japan, Sakhalin, Kamchatka, Alaska, British Columbia, California, New Zealand, Antarctica (Seymour Island)
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Upper Cretaceous (Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Whorl section always rounded, early whorls circular or depressed, later whorls compressed and higher, mold smooth, but shell with very fine, prorsiradiate or sinuous lirae, periodic, collared constrictions on inner whorls becoming more numerous on outer whorls, where they form broad, flattened, foldlike ribs. Derived from E. (Eogaudryceras) in the early Albian.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Tetragonitaceae
Family:
Gaudryceratidae
Formal Genus Name and Reference:
Anagaudryceras SHIMIZU, 1934, p. 67
Type Species:
Ammonites sacya FORBES, 1846, p. 113, OD
Images
(Click to enlarge in a new window)
Fig. 1, 4 a-d . * A. sacya (Forbes), Upper Albian or Cenomanian, southeastern India (Verdachellum), a, b, holotype, BMNH C.51067, X 1 (new), c, d, holotype of Ammonites buddha Forbes, BMNH C.22673, X0.7 (new)"
Synonyms
Paragaudryceras, Murphyella Matsumoto
Geographic Distribution
England, France, Germany, Austria, Romania, Algeria, Angola, South Africa (Zululand), Madagascar, southeastern India, Japan, Sakhalin, Kamchatka, Alaska, British Columbia, California, New Zealand, Antarctica (Seymour Island)
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Upper Cretaceous (Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Whorl section always rounded, early whorls circular or depressed, later whorls compressed and higher, mold smooth, but shell with very fine, prorsiradiate or sinuous lirae, periodic, collared constrictions on inner whorls becoming more numerous on outer whorls, where they form broad, flattened, foldlike ribs. Derived from E. (Eogaudryceras) in the early Albian.