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Perisphinctes
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Perisphinctes WAAGEN, 1869
Type Species:
Am. variocostatus BUCKLAND, 1836; SD proposed ARKELL, 1951, accepted ICZN 1954 (Opinion 303)
Images
(Click to enlarge in a new window)
Fig. 408,9. *P. (P.) variocostatus (BUCKLAND), Eng.; 9a,b, holotype, X0.25 (6*)
Synonyms
Martelliceras
Geographic Distribution
Eu. - N. Afr.-Sinai-Abys.-Kenya-Tangan.-Anatolia- Donetz-C.Russia-?Persia-Attock-Cutch-Japan-Cuba
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(U.Oxf.)
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
50
Beginning Date:
158.16
Ending Stage in Treatise Usage:
U.Jur.(U.Oxf.)
Ending International Stage:
Oxfordian
Fraction Up In Ending Stage:
100
Ending Date:
154.78
Description
Large to gigantic, whorls quadrate; inner and middle whorls sharply ribbed, with sudden change at outer whorl to strong, coarse, distant, ridge- or wedge-shaped primaries; peristome simple, no constrictions.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Perisphinctidae
Formal Genus Name and Reference:
Perisphinctes WAAGEN, 1869
Type Species:
Am. variocostatus BUCKLAND, 1836; SD proposed ARKELL, 1951, accepted ICZN 1954 (Opinion 303)
Images
(Click to enlarge in a new window)
Fig. 408,9. *P. (P.) variocostatus (BUCKLAND), Eng.; 9a,b, holotype, X0.25 (6*)
Synonyms
Martelliceras
Geographic Distribution
Eu. - N. Afr.-Sinai-Abys.-Kenya-Tangan.-Anatolia- Donetz-C.Russia-?Persia-Attock-Cutch-Japan-Cuba
Age Range
Beginning Stage in Treatise Usage:
U.Jur.(U.Oxf.)
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
50
Beginning Date:
158.16
Ending Stage in Treatise Usage:
U.Jur.(U.Oxf.)
Ending International Stage:
Oxfordian
Fraction Up In Ending Stage:
100
Ending Date:
154.78
Description
Large to gigantic, whorls quadrate; inner and middle whorls sharply ribbed, with sudden change at outer whorl to strong, coarse, distant, ridge- or wedge-shaped primaries; peristome simple, no constrictions.