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Diaboloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Schistoceratoidea
Family:
Schistoceratidae
Formal Genus Name and Reference:
Diaboloceras Miller & FURNISH, 1940c, p. 527
Type Species:
D. varicostatum, OD
Images
(Click to enlarge in a new window)
Fig. 66, 3a. *D. varicostatum, suture, Braggs Mountain, southeastern Muskogee, Oklahoma, USA, lower Atoka Formation, SUI 1418, diameter at approximately 50 mm, × 1.3 (Miller & Furnish, 1958a), Fig. 66, 3b-c. D. neumeieri Quinn & Carr, conglomeratic limestone in Trace Creek Shale Member, Bloyd Formation, 3.2 km west of Woolsey, Washington County, Arkansas, USA, b, holotype, UA L11WO1, × 0.3, c, paratype, UA L11WO2, side view of fragment, × 1.7 (McCaleb, 1968), Fig. 66, 3d. D. ruzhencevi Andrianov, upper Bashkirian, Siberia, ×0.17 (Ruzhentsev & Ganelin, 1971), Fig. 66, 3e-f. D. uralicum (Librovich), Sibai Canyon, Urtazym area, Orenburgskaia oblast', South Urals, Kordailov Formation, upper Bashkirian, × 3 (Librovich, 1957)
Synonyms
Trigonogastrioceras; ?Rodiezmoceras
Geographic Distribution
Spain, Russia (Novaia Zemlia, South Urals, Siberia), Ukraine (Donets), China (Xinjiang), Japan, Canada (Northwest Territories), USA (Alabama, Arkansas, Kentucky, Oklahoma, Texas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (upper Bashkirian)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Pennsylvanian (Moscovian)
Ending International Stage:
Moscovian
Fraction Up In Ending Stage:
100
Ending Date:
307.02
Description
Conch very large, umbilicus always wide; inner whorls exhibit triangular coiling and may develop keel and two ventral grooves. Ribs on flanks weak, ornamentation reticulate. Second umbilical lobe on dorsal side of lateral lobe, not yet separate; sutural formula: (E1 Em E1 )AL(U2 )U1 I [German], (V 1 V 1 )L(U 1 U 2 ):ID [Russian]. Eight species. [Trigonogastrioceras was based on an immature specimen; for discussion, see gordon, 1965, p. 267. Rodiezmoceras, based on three poorly preserved specimens, also has coarse ribs, but the axis of the umbilical lobe lies on the lateral flank; it may be a representative of Diaboloceras or Paralegoceras. For discussion of genus, see nassichuK, 1975, p. 147; s aunders , m anger , & g ordon , 1977, p. 124; and ruzhentsev & BogoslovsKaia, 1978, p. 63.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Schistoceratoidea
Family:
Schistoceratidae
Formal Genus Name and Reference:
Diaboloceras Miller & FURNISH, 1940c, p. 527
Type Species:
D. varicostatum, OD
Images
(Click to enlarge in a new window)
Fig. 66, 3a. *D. varicostatum, suture, Braggs Mountain, southeastern Muskogee, Oklahoma, USA, lower Atoka Formation, SUI 1418, diameter at approximately 50 mm, × 1.3 (Miller & Furnish, 1958a), Fig. 66, 3b-c. D. neumeieri Quinn & Carr, conglomeratic limestone in Trace Creek Shale Member, Bloyd Formation, 3.2 km west of Woolsey, Washington County, Arkansas, USA, b, holotype, UA L11WO1, × 0.3, c, paratype, UA L11WO2, side view of fragment, × 1.7 (McCaleb, 1968), Fig. 66, 3d. D. ruzhencevi Andrianov, upper Bashkirian, Siberia, ×0.17 (Ruzhentsev & Ganelin, 1971), Fig. 66, 3e-f. D. uralicum (Librovich), Sibai Canyon, Urtazym area, Orenburgskaia oblast', South Urals, Kordailov Formation, upper Bashkirian, × 3 (Librovich, 1957)
Synonyms
Trigonogastrioceras; ?Rodiezmoceras
Geographic Distribution
Spain, Russia (Novaia Zemlia, South Urals, Siberia), Ukraine (Donets), China (Xinjiang), Japan, Canada (Northwest Territories), USA (Alabama, Arkansas, Kentucky, Oklahoma, Texas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (upper Bashkirian)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Pennsylvanian (Moscovian)
Ending International Stage:
Moscovian
Fraction Up In Ending Stage:
100
Ending Date:
307.02
Description
Conch very large, umbilicus always wide; inner whorls exhibit triangular coiling and may develop keel and two ventral grooves. Ribs on flanks weak, ornamentation reticulate. Second umbilical lobe on dorsal side of lateral lobe, not yet separate; sutural formula: (E1 Em E1 )AL(U2 )U1 I [German], (V 1 V 1 )L(U 1 U 2 ):ID [Russian]. Eight species. [Trigonogastrioceras was based on an immature specimen; for discussion, see gordon, 1965, p. 267. Rodiezmoceras, based on three poorly preserved specimens, also has coarse ribs, but the axis of the umbilical lobe lies on the lateral flank; it may be a representative of Diaboloceras or Paralegoceras. For discussion of genus, see nassichuK, 1975, p. 147; s aunders , m anger , & g ordon , 1977, p. 124; and ruzhentsev & BogoslovsKaia, 1978, p. 63.]