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Vascoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Vascoceras CHOFFAT, 1898, p. 51
Type Species:
V. gamai, OD
Images
(Click to enlarge in a new window)
Fig. 135a-c. *V. gamai, Upper Cenomanian, Portugal, X 0.5 (Choffat, 1898)
Synonyms
Pachyvascoceras; Paracanthoceras; Paravascoceras; Broggiiceras; Greenhornoceras; Provascoceras; Nannovascoceras
Geographic Distribution
France, Portugal, Spain, Israel, northern and western Africa, Oman, Japan, Texas, Mexico, Colombia, Venezuela, Peru, Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian, ?Lower Turonian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
75
Beginning Date:
95.55
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian, ?Lower Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
25
Ending Date:
92.77
Description
Very variable, early whorls involute to evolute, depressed to compressed, with strong constrictions, ribs bordering constrictions may have umbilical bullae, intermediate ribs, if present, mainly on outer part. Later whorls evolute, moderately compressed to cadicone, smooth or with ventrolateral bulges strengthening into strong, prorsiradiate ribs on outer part of sides and venter, but without regular umbilical tubercles. Suture irregular, with wide, shallow, feebly indented elements.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Vascoceras CHOFFAT, 1898, p. 51
Type Species:
V. gamai, OD
Images
(Click to enlarge in a new window)
Fig. 135a-c. *V. gamai, Upper Cenomanian, Portugal, X 0.5 (Choffat, 1898)
Synonyms
Pachyvascoceras; Paracanthoceras; Paravascoceras; Broggiiceras; Greenhornoceras; Provascoceras; Nannovascoceras
Geographic Distribution
France, Portugal, Spain, Israel, northern and western Africa, Oman, Japan, Texas, Mexico, Colombia, Venezuela, Peru, Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian, ?Lower Turonian)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
75
Beginning Date:
95.55
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian, ?Lower Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
25
Ending Date:
92.77
Description
Very variable, early whorls involute to evolute, depressed to compressed, with strong constrictions, ribs bordering constrictions may have umbilical bullae, intermediate ribs, if present, mainly on outer part. Later whorls evolute, moderately compressed to cadicone, smooth or with ventrolateral bulges strengthening into strong, prorsiradiate ribs on outer part of sides and venter, but without regular umbilical tubercles. Suture irregular, with wide, shallow, feebly indented elements.