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Strigogoniatites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Paragastrioceratidae
Formal Genus Name and Reference:
Strigogoniatites SPATH, 1934, p. 15
Type Species:
Glyphioceras angulatum HANIEL, 1915, p. 51, OD
Images
(Click to enlarge in a new window)
Fig. 107, 1 a-c .* S. angulatum (Haniel), holotype, Amarassi beds, Wuchiapingian, Amarassi, Timor, MTHD 12703, a-b, X 0.67, c, diameter at 72 mm (new)."
Synonyms
Retiogastrioceras; Metagastrioceras; Sabaliceras
Geographic Distribution
Indonesia (Timor), USA (western Texas), Mexico (Coahuila), southern China (widespread), Tunisia, Iran (northern)
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:
Lopingian (Wuchiapingian, ?Changhsingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Similar to Altudoceras, from which it evolved, but with smaller umbilicus (Umin/D, commonly 0.2-0.25). Ornament comprises strong strigae that are restricted progressively to ventrolateral flanks as maturity is approached. Transverse section of mature whorls characterized by shallowly concave dorsolateral flanks separated by broad ridge from flat ventrolateral flanks that converge to an angular to narrowly rounded venter. Ventral lobe constricted medially in advanced forms, with wedge-shaped anteriorly divergent prongs.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Paragastrioceratidae
Formal Genus Name and Reference:
Strigogoniatites SPATH, 1934, p. 15
Type Species:
Glyphioceras angulatum HANIEL, 1915, p. 51, OD
Images
(Click to enlarge in a new window)
Fig. 107, 1 a-c .* S. angulatum (Haniel), holotype, Amarassi beds, Wuchiapingian, Amarassi, Timor, MTHD 12703, a-b, X 0.67, c, diameter at 72 mm (new)."
Synonyms
Retiogastrioceras; Metagastrioceras; Sabaliceras
Geographic Distribution
Indonesia (Timor), USA (western Texas), Mexico (Coahuila), southern China (widespread), Tunisia, Iran (northern)
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:
Lopingian (Wuchiapingian, ?Changhsingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Similar to Altudoceras, from which it evolved, but with smaller umbilicus (Umin/D, commonly 0.2-0.25). Ornament comprises strong strigae that are restricted progressively to ventrolateral flanks as maturity is approached. Transverse section of mature whorls characterized by shallowly concave dorsolateral flanks separated by broad ridge from flat ventrolateral flanks that converge to an angular to narrowly rounded venter. Ventral lobe constricted medially in advanced forms, with wedge-shaped anteriorly divergent prongs.