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Pseudoschloenbachia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Muniericeratidae
Formal Genus Name and Reference:
Pseudoschloenbachia SPATH, 1921a, p. 236
Type Species:
Ammonites umbulazi BAILY, 1855, p. 456, OD
Images
(Click to enlarge in a new window)
FIG. 83,1a,b. *P. (P.) umbulazi (BAILY), Upper Santonian, South Africa (Pondoland); × 1 (Hoepen, 1921).—F IG. 83,1c. P. (P.) griesbachi (H OEPEN), Upper Santonian, South Africa (Pondoland); × 1 (Hoepen, 1921).
Synonyms
Geographic Distribution
Spain, Egypt, Syria, southeastern Africa, Madagascar, southern India, British Columbia, Texas, Mississippi
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Middle Santonian)
Beginning International Stage:
Santonian
Fraction Up In Beginning Stage:
20
Beginning Date:
85.29
Ending Stage in Treatise Usage:
Upper Cretaceous (Lower Campanian)
Ending International Stage:
Campanian
Fraction Up In Ending Stage:
50
Ending Date:
77.91
Description
Small to moderately large, more or less evolute, typically with parallel sides and fastigiate venter, distinct umbilical tubercles, and sinuous branching ribs, in later radiation inflated and square-whorled, cordate, or lanceolate forms occur, ribs and tubercles may coarsen or disappear, or ribs may break up into fine riblets
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Muniericeratidae
Formal Genus Name and Reference:
Pseudoschloenbachia SPATH, 1921a, p. 236
Type Species:
Ammonites umbulazi BAILY, 1855, p. 456, OD
Images
(Click to enlarge in a new window)
FIG. 83,1a,b. *P. (P.) umbulazi (BAILY), Upper Santonian, South Africa (Pondoland); × 1 (Hoepen, 1921).—F IG. 83,1c. P. (P.) griesbachi (H OEPEN), Upper Santonian, South Africa (Pondoland); × 1 (Hoepen, 1921).
Synonyms
Geographic Distribution
Spain, Egypt, Syria, southeastern Africa, Madagascar, southern India, British Columbia, Texas, Mississippi
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Middle Santonian)
Beginning International Stage:
Santonian
Fraction Up In Beginning Stage:
20
Beginning Date:
85.29
Ending Stage in Treatise Usage:
Upper Cretaceous (Lower Campanian)
Ending International Stage:
Campanian
Fraction Up In Ending Stage:
50
Ending Date:
77.91
Description
Small to moderately large, more or less evolute, typically with parallel sides and fastigiate venter, distinct umbilical tubercles, and sinuous branching ribs, in later radiation inflated and square-whorled, cordate, or lanceolate forms occur, ribs and tubercles may coarsen or disappear, or ribs may break up into fine riblets