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Aristoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Thalassoceratoidea
Family:
Thalassoceratidae
Subfamily:
Thalassoceratinae
Formal Genus Name and Reference:
Aristoceras RUZHENTSEV, 1940b, p. 524
Type Species:
A. chkalovi RUZHENTSEV, 1940b, p. 526, OD
Images
(Click to enlarge in a new window)
Fig. 63, 1a-d. *A. chkalovi, a-b, South Urals, Russia, Gzhelian, X 1.25 (Bogoslovskii, Librovich, & Ruzhentsev, 1962), c-d, west of Nikols'kii, South Urals, lower part of Orenburg stage, c, holotype, suture, PIN 320/786, whorl height at 10.4 mm , whorl width 8.2 mm , X 3.4 (Ruzhentsev, 1950), d, cross section, PIN 320/787, X 2.7 (Ruzhentsev, 1950).
Synonyms
Uralites
Geographic Distribution
Russia and Kazakhstan (South Urals), ?Spain, USA (Oklahoma, Texas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Kasimovian)
Beginning International Stage:
Kasimovian
Fraction Up In Beginning Stage:
0
Beginning Date:
307.02
Ending Stage in Treatise Usage:
Cisuralian (Asselian)
Ending International Stage:
Asselian
Fraction Up In Ending Stage:
100
Ending Date:
293.52
Description
Conch form discoidal, with narrow or closed umbilicus, venter flat, with ventrolateral grooves. Coarse sinuous growth lamellae forming deep ventral sinus and narrow ventrolateral salient. Constrictions may be present. Suture similar to Eothalassoceras.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Thalassoceratoidea
Family:
Thalassoceratidae
Subfamily:
Thalassoceratinae
Formal Genus Name and Reference:
Aristoceras RUZHENTSEV, 1940b, p. 524
Type Species:
A. chkalovi RUZHENTSEV, 1940b, p. 526, OD
Images
(Click to enlarge in a new window)
Fig. 63, 1a-d. *A. chkalovi, a-b, South Urals, Russia, Gzhelian, X 1.25 (Bogoslovskii, Librovich, & Ruzhentsev, 1962), c-d, west of Nikols'kii, South Urals, lower part of Orenburg stage, c, holotype, suture, PIN 320/786, whorl height at 10.4 mm , whorl width 8.2 mm , X 3.4 (Ruzhentsev, 1950), d, cross section, PIN 320/787, X 2.7 (Ruzhentsev, 1950).
Synonyms
Uralites
Geographic Distribution
Russia and Kazakhstan (South Urals), ?Spain, USA (Oklahoma, Texas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Kasimovian)
Beginning International Stage:
Kasimovian
Fraction Up In Beginning Stage:
0
Beginning Date:
307.02
Ending Stage in Treatise Usage:
Cisuralian (Asselian)
Ending International Stage:
Asselian
Fraction Up In Ending Stage:
100
Ending Date:
293.52
Description
Conch form discoidal, with narrow or closed umbilicus, venter flat, with ventrolateral grooves. Coarse sinuous growth lamellae forming deep ventral sinus and narrow ventrolateral salient. Constrictions may be present. Suture similar to Eothalassoceras.