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Eoasianites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Neoicoceratidae
Formal Genus Name and Reference:
Eoasianites RUZHENTSEV, 1933, p. 165
Type Species:
E. subhanieli RUZHENTSEV, 1933, p. 166, OD
Images
(Click to enlarge in a new window)
Fig. 103, 2a-b. *E. subhanieli, holotype, Sholak-sai river, South Urals, uppermost Asselian, PIN 318/1207, X 1 (Ruzhentsev, 1951).", "Fig. 103, 2c. E. hartmannae Ruzhentsev, suture, Zhaksy-Kargala river, South Urals, uppermost Asselian, PIN 318/312, whorl height at 9.8 mm , whorl width 19.6 mm , X 1.8 (Ruzhentsev, 1951).", "Fig. 103, 2d. E. concinnus Ruzhentsev, cross section, west of Nikolskii, right bank of Ural river, Chkalovskaia Oblast', South Urals, lower part of Orenburg formation, Gzhelian, PIN 320/1740, X 4 (Ruzhentsev, 1950)."
Synonyms
Prometalegoceras; Trochilioceras; Pronoceras
Geographic Distribution
Russia and Kazakhstan (South Urals), China (Guangxi, Xinjiang), Tajikistan (Pamirs), Canada (Yukon), USA (Alaska, Kansas, 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 subdiscoidal, evolute, with low height of aperture. Transverse striae usually with orad salient. Umbilical tubercles confined to immature stages; constrictions may be present. Ventral lobe with slightly pouched prongs, median saddle exceeding two-thirds height of entire ventral lobe. First lateral saddle subacute. More than ten species. [The type species of Trochilioceras and Pronoceras are regarded as congeneric with Eoasianites. For discussion, see RuzhentSev, 1950, p. 129.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Neoicoceratidae
Formal Genus Name and Reference:
Eoasianites RUZHENTSEV, 1933, p. 165
Type Species:
E. subhanieli RUZHENTSEV, 1933, p. 166, OD
Images
(Click to enlarge in a new window)
Fig. 103, 2a-b. *E. subhanieli, holotype, Sholak-sai river, South Urals, uppermost Asselian, PIN 318/1207, X 1 (Ruzhentsev, 1951).", "Fig. 103, 2c. E. hartmannae Ruzhentsev, suture, Zhaksy-Kargala river, South Urals, uppermost Asselian, PIN 318/312, whorl height at 9.8 mm , whorl width 19.6 mm , X 1.8 (Ruzhentsev, 1951).", "Fig. 103, 2d. E. concinnus Ruzhentsev, cross section, west of Nikolskii, right bank of Ural river, Chkalovskaia Oblast', South Urals, lower part of Orenburg formation, Gzhelian, PIN 320/1740, X 4 (Ruzhentsev, 1950)."
Synonyms
Prometalegoceras; Trochilioceras; Pronoceras
Geographic Distribution
Russia and Kazakhstan (South Urals), China (Guangxi, Xinjiang), Tajikistan (Pamirs), Canada (Yukon), USA (Alaska, Kansas, 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 subdiscoidal, evolute, with low height of aperture. Transverse striae usually with orad salient. Umbilical tubercles confined to immature stages; constrictions may be present. Ventral lobe with slightly pouched prongs, median saddle exceeding two-thirds height of entire ventral lobe. First lateral saddle subacute. More than ten species. [The type species of Trochilioceras and Pronoceras are regarded as congeneric with Eoasianites. For discussion, see RuzhentSev, 1950, p. 129.]