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Prorasenia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Prorasenia SCHINDEWOLF, 1925
Type Species:
P. quenstedti
Images
(Click to enlarge in a new window)
Fig. 419,5. *P. quenstedti, Ger.; X1.3 (700*).
Synonyms
Desmosphinctes
Geographic Distribution
Eu.-Russia
Age Range
Beginning Stage in Treatise Usage:
Kimm.
Beginning International Stage:
Kimmeridgian
Fraction Up In Beginning Stage:
0
Beginning Date:
154.78
Ending Stage in Treatise Usage:
Kimm.
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
100
Ending Date:
149.24
Description
Like Microbiplices, but inner whorls have triplicate Rasenia-like ribbing, on outer whorl ribbing becomes sharper and biplicate, aperture with lappets.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Prorasenia SCHINDEWOLF, 1925
Type Species:
P. quenstedti
Images
(Click to enlarge in a new window)
Fig. 419,5. *P. quenstedti, Ger.; X1.3 (700*).
Synonyms
Desmosphinctes
Geographic Distribution
Eu.-Russia
Age Range
Beginning Stage in Treatise Usage:
Kimm.
Beginning International Stage:
Kimmeridgian
Fraction Up In Beginning Stage:
0
Beginning Date:
154.78
Ending Stage in Treatise Usage:
Kimm.
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
100
Ending Date:
149.24
Description
Like Microbiplices, but inner whorls have triplicate Rasenia-like ribbing, on outer whorl ribbing becomes sharper and biplicate, aperture with lappets.