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Aconeceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ammonitina
Superfamily:
Haplocerataceae
Family:
Oppeliidae
Subfamily:
Aconeceratinae
Formal Genus Name and Reference:
Aconeceras HYATT, 1903
Type Species:
Am. nisus D'ORBIGNY, 1841
Images
(Click to enlarge in a new window)
Fig. 338,6,8. *A. nisus (Orb.), U. Apt., Fr., 6 a, b, × 1.5, × 1, 8, × 4 (696*)
Synonyms
Adolphia
Geographic Distribution
W.Eu.-S.Afr.-E.Austral.
Age Range
Beginning Stage in Treatise Usage:
U.Barrem.
Beginning International Stage:
Barremian
Fraction Up In Beginning Stage:
50
Beginning Date:
123.95
Ending Stage in Treatise Usage:
L.Alb.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
25
Ending Date:
110.03
Description
Involute, high-whorled with flat sides and very finely serrate keel, Radial line more angulate, suture more finely divided and with narrower, deeper elements than in Protaconeceras
References
Hyatt, Alpheus, 1903, Pseudoceratites of the Cretaceous: U. S. Geol. Survey, Mon. 44, 351 p., 47 pl.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ammonitina
Superfamily:
Haplocerataceae
Family:
Oppeliidae
Subfamily:
Aconeceratinae
Formal Genus Name and Reference:
Aconeceras HYATT, 1903
Type Species:
Am. nisus D'ORBIGNY, 1841
Images
(Click to enlarge in a new window)
Fig. 338,6,8. *A. nisus (Orb.), U. Apt., Fr., 6 a, b, × 1.5, × 1, 8, × 4 (696*)
Synonyms
Adolphia
Geographic Distribution
W.Eu.-S.Afr.-E.Austral.
Age Range
Beginning Stage in Treatise Usage:
U.Barrem.
Beginning International Stage:
Barremian
Fraction Up In Beginning Stage:
50
Beginning Date:
123.95
Ending Stage in Treatise Usage:
L.Alb.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
25
Ending Date:
110.03
Description
Involute, high-whorled with flat sides and very finely serrate keel, Radial line more angulate, suture more finely divided and with narrower, deeper elements than in Protaconeceras
References
Hyatt, Alpheus, 1903, Pseudoceratites of the Cretaceous: U. S. Geol. Survey, Mon. 44, 351 p., 47 pl.