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Metalegoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Metalegoceratidae
Formal Genus Name and Reference:
Metalegoceras SCHINDEWOLF, 1931, p. 199
Type Species:
Paralegoceras sundaicum form. evoluta HANIEL, 1915, p. 60, OD
Images
(Click to enlarge in a new window)
Fig. 109, 3a-c. *M. evolutum (Haniel), a-b, Bitauni beds, Baigendzhinian, Timor, Indonesia, X 0.67 (Glenister, Windle, & Furnish, 1973), c, Baigendzhinian, Southern Urals, diameter at 30 mm (Ruzhentsev, 1956b).
Synonyms
Epilegoceras; Asianites; Dodecalegoceras
Geographic Distribution
Xizang, Guizhou, Jiangxi, USA (Texas, New Mexico), Canada (Yukon, Northwest Territories), Oman
Age Range
Beginning Stage in Treatise Usage:
Cisuralian (Artinskian)
Beginning International Stage:
Artinskian
Fraction Up In Beginning Stage:
0
Beginning Date:
290.51
Ending Stage in Treatise Usage:
Guadalupian (?Roadian-?Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Conch variable in relative width (W/D, 0.5–0.9) and umbilical diameter (Umax/D, 0.3–0.8). Suture has 12 lobes, 7 external; 3 umbilical elements (U2 U1 U3 ) are fully isolated; U2 subequal to or larger in area than U1 , both external; U 3 internal and subequal to U1 . Sutural formula: (V1 V1 )LU2 U1 :U3 ID [Russian], (E1 Em E1 )ALv Lm Ld UI [German]. Thirty-seven named species. [Several new species of metalegoceratid have been described (zhao & zheng, 1977) from the Hutang Formation (Roadian–Wordian) of southern China (Jiangxi) and referred to Metalegoceras. They represent the basis for extending the range of the subfamily above the Baigendzhinian, although some aspects of both morphology and occurrence remain unclear.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Neoicoceratoidea
Family:
Metalegoceratidae
Formal Genus Name and Reference:
Metalegoceras SCHINDEWOLF, 1931, p. 199
Type Species:
Paralegoceras sundaicum form. evoluta HANIEL, 1915, p. 60, OD
Images
(Click to enlarge in a new window)
Fig. 109, 3a-c. *M. evolutum (Haniel), a-b, Bitauni beds, Baigendzhinian, Timor, Indonesia, X 0.67 (Glenister, Windle, & Furnish, 1973), c, Baigendzhinian, Southern Urals, diameter at 30 mm (Ruzhentsev, 1956b).
Synonyms
Epilegoceras; Asianites; Dodecalegoceras
Geographic Distribution
Xizang, Guizhou, Jiangxi, USA (Texas, New Mexico), Canada (Yukon, Northwest Territories), Oman
Age Range
Beginning Stage in Treatise Usage:
Cisuralian (Artinskian)
Beginning International Stage:
Artinskian
Fraction Up In Beginning Stage:
0
Beginning Date:
290.51
Ending Stage in Treatise Usage:
Guadalupian (?Roadian-?Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Conch variable in relative width (W/D, 0.5–0.9) and umbilical diameter (Umax/D, 0.3–0.8). Suture has 12 lobes, 7 external; 3 umbilical elements (U2 U1 U3 ) are fully isolated; U2 subequal to or larger in area than U1 , both external; U 3 internal and subequal to U1 . Sutural formula: (V1 V1 )LU2 U1 :U3 ID [Russian], (E1 Em E1 )ALv Lm Ld UI [German]. Thirty-seven named species. [Several new species of metalegoceratid have been described (zhao & zheng, 1977) from the Hutang Formation (Roadian–Wordian) of southern China (Jiangxi) and referred to Metalegoceras. They represent the basis for extending the range of the subfamily above the Baigendzhinian, although some aspects of both morphology and occurrence remain unclear.]