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Pseudogastrioceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Neoicoceratoidea
Family:
Paragastrioceratidae
Subfamily:
Pseudogastrioceratinae
Formal Genus Name and Reference:
Pseudogastrioceras SPATH, 1930, p. 8
Type Species:
Goniatites Abichianus MÖLLER, 1879, p. 230, M
Images
(Click to enlarge in a new window)
Fig. 106, 5a-c. * P. abichianum (Möller), Wuchiapingian, vicinity of Dzhulfa, Nakhichevan, a-b, X 0.67, c, diameter at 60 mm (Ruzhentsev, 1974a).
Synonyms
Grabauites
Geographic Distribution
Armenia, Azerbaijan (Nakhichevan), Iran (north, central), southern China (widespread), Japan (Kitakami)
Age Range
Beginning Stage in Treatise Usage:
Lopingian
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Lopingian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Conch large, involute (Umin/D, 0.1–0.2) with strongly compressed whorls and narrowly rounded, mature venter. Coarse longitudinal strigae are confined to venter and ventrolateral flanks; conspicuous dorsolateral ornament absent in all growth stages. Sutures characterized by strongly divergent flanks of ventral lobe, wide asymmetric ventral prongs (width V1 /L approximates 1.0), and relatively unconstricted flaring flanks of lateral lobe. Six species. [Pseudogastrioceras resembles and intergrades with the weakly ornamented involute species of both Roadoceras and Altudoceras, e.g., R. roadense (BöSe, 1919) and A. altudense (BöSe, 1919); but it is separable primarily on conch form and sutural contours.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Neoicoceratoidea
Family:
Paragastrioceratidae
Subfamily:
Pseudogastrioceratinae
Formal Genus Name and Reference:
Pseudogastrioceras SPATH, 1930, p. 8
Type Species:
Goniatites Abichianus MÖLLER, 1879, p. 230, M
Images
(Click to enlarge in a new window)
Fig. 106, 5a-c. * P. abichianum (Möller), Wuchiapingian, vicinity of Dzhulfa, Nakhichevan, a-b, X 0.67, c, diameter at 60 mm (Ruzhentsev, 1974a).
Synonyms
Grabauites
Geographic Distribution
Armenia, Azerbaijan (Nakhichevan), Iran (north, central), southern China (widespread), Japan (Kitakami)
Age Range
Beginning Stage in Treatise Usage:
Lopingian
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Lopingian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Conch large, involute (Umin/D, 0.1–0.2) with strongly compressed whorls and narrowly rounded, mature venter. Coarse longitudinal strigae are confined to venter and ventrolateral flanks; conspicuous dorsolateral ornament absent in all growth stages. Sutures characterized by strongly divergent flanks of ventral lobe, wide asymmetric ventral prongs (width V1 /L approximates 1.0), and relatively unconstricted flaring flanks of lateral lobe. Six species. [Pseudogastrioceras resembles and intergrades with the weakly ornamented involute species of both Roadoceras and Altudoceras, e.g., R. roadense (BöSe, 1919) and A. altudense (BöSe, 1919); but it is separable primarily on conch form and sutural contours.]