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Altudoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Paragastrioceratidae
Formal Genus Name and Reference:
Altudoceras RUZHENTSEV, 1940c, p. 286
Type Species:
Gastrioceras altudense BÖSE, 1919, p. 88, OD
Images
(Click to enlarge in a new window)
Fig. 106, 4a-d. * A. altudense (Böse), Wordian, western Texas, a-c, × 1.33, d, diameter at 20 mm (Miller & Furnish, 1940a).
Synonyms
Hengshanites
Geographic Distribution
USA (western Texas, Alaska), Mexico (Coahuila), Italy (Sicily), Tunisia, Oman, Iraq (Kurdistan), Pakistan, China (widespread), Russia (Novaia Zemlia), Indonesia (Timor)
Age Range
Beginning Stage in Treatise Usage:
Guadalupian (Wordian)
Beginning International Stage:
Wordian
Fraction Up In Beginning Stage:
0
Beginning Date:
269.21
Ending Stage in Treatise Usage:
Guadalupian (Capitanian)
Ending International Stage:
Capitanian
Fraction Up In Ending Stage:
100
Ending Date:
259.55
Description
Similar to Pseudogastrioceras in general conch form, but with wider umbilicus (Umin/D, 0.25–0.5) and conspicuous dorsolateral ribs or nodes in at least juvenile stages. Hyponomic sinus deep and rounded. Ventral lobe characterized by subparallel flanks and narrow asymmetric prongs (width V1 /L 0.6–1.0). Fourteen named species.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Paragastrioceratidae
Formal Genus Name and Reference:
Altudoceras RUZHENTSEV, 1940c, p. 286
Type Species:
Gastrioceras altudense BÖSE, 1919, p. 88, OD
Images
(Click to enlarge in a new window)
Fig. 106, 4a-d. * A. altudense (Böse), Wordian, western Texas, a-c, × 1.33, d, diameter at 20 mm (Miller & Furnish, 1940a).
Synonyms
Hengshanites
Geographic Distribution
USA (western Texas, Alaska), Mexico (Coahuila), Italy (Sicily), Tunisia, Oman, Iraq (Kurdistan), Pakistan, China (widespread), Russia (Novaia Zemlia), Indonesia (Timor)
Age Range
Beginning Stage in Treatise Usage:
Guadalupian (Wordian)
Beginning International Stage:
Wordian
Fraction Up In Beginning Stage:
0
Beginning Date:
269.21
Ending Stage in Treatise Usage:
Guadalupian (Capitanian)
Ending International Stage:
Capitanian
Fraction Up In Ending Stage:
100
Ending Date:
259.55
Description
Similar to Pseudogastrioceras in general conch form, but with wider umbilicus (Umin/D, 0.25–0.5) and conspicuous dorsolateral ribs or nodes in at least juvenile stages. Hyponomic sinus deep and rounded. Ventral lobe characterized by subparallel flanks and narrow asymmetric prongs (width V1 /L 0.6–1.0). Fourteen named species.