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Progeronia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Progeronia ARKELL, 1953 [pro Ammonia Ilovaisky & Florensky, 1941 (non Brünnich, 1772, nec Косн, 1842)] [Subgen. of Perisphinctes.]
Type Species:
Perisphinctes progeron von АМMON, 1875
Images
(Click to enlarge in a new window)
Fig. 408,8. *P. (P.) progeron VON AMMON, Ger.; X0.4 (429*)
Synonyms
Geographic Distribution
Eu.-S.Russia-C.Arabia
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(L.Kimm.)
Beginning International Stage:
Kimmeridgian
Fraction Up In Beginning Stage:
0
Beginning Date:
154.78
Ending Stage in Treatise Usage:
U.Jur.(L.Kimm.)
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
50
Ending Date:
152.01
Description
Large evolute derivatives of Arisphinctes, with biplicate and triplicate ribbing which modifies gradually as in Arisphinctes, but on outer whorl becomes irregular and "ataxioceratid," with lengthened secondaries. [Subgen. of Perisphinctes.]
References
Arkell, W. J., 1953, Seven new genera of lurassic ammonites: Geol. Mag., v. 90, p. 36-40.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Progeronia ARKELL, 1953 [pro Ammonia Ilovaisky & Florensky, 1941 (non Brünnich, 1772, nec Косн, 1842)] [Subgen. of Perisphinctes.]
Type Species:
Perisphinctes progeron von АМMON, 1875
Images
(Click to enlarge in a new window)
Fig. 408,8. *P. (P.) progeron VON AMMON, Ger.; X0.4 (429*)
Synonyms
Geographic Distribution
Eu.-S.Russia-C.Arabia
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(L.Kimm.)
Beginning International Stage:
Kimmeridgian
Fraction Up In Beginning Stage:
0
Beginning Date:
154.78
Ending Stage in Treatise Usage:
U.Jur.(L.Kimm.)
Ending International Stage:
Kimmeridgian
Fraction Up In Ending Stage:
50
Ending Date:
152.01
Description
Large evolute derivatives of Arisphinctes, with biplicate and triplicate ribbing which modifies gradually as in Arisphinctes, but on outer whorl becomes irregular and "ataxioceratid," with lengthened secondaries. [Subgen. of Perisphinctes.]
References
Arkell, W. J., 1953, Seven new genera of lurassic ammonites: Geol. Mag., v. 90, p. 36-40.