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Paraschistoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Schistoceratoidea
Family:
Schistoceratidae
Formal Genus Name and Reference:
Paraschistoceras Plummer & SCOTT, 1937, p. 248
Type Species:
Ammonites hildrethi MORTON, 1836, p. 149, OD
Images
(Click to enlarge in a new window)
Fig. 67, 1a-b. *P. hildrethi (Morton), Kansas City, Missouri, USA, Muncie Creek shale, Missourian, × 1.5 (Miller & Furnish, 1940c), FIG. 67, 1c. P. postvenatum (Plummer & Scott), suture, 24 km south of Holdenville, Hughes County, Oklahoma, USA, Wewoka Formation, Desmoinesian, SUI 1962, diameter at approximately 75 mm, × 0.7 (Miller & Furnish, 1958a)
Synonyms
Pintoceras
Geographic Distribution
Russia and Kazakhstan (South Urals), Russia (Siberia), Uzbekistan (Fergana), USA (Illinois, Kansas, Missouri, Ohio, Oklahoma, Pennsylvania, Texas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Kasimovian)
Beginning International Stage:
Kasimovian
Fraction Up In Beginning Stage:
0
Beginning Date:
307.02
Ending Stage in Treatise Usage:
Pennsylvanian (Gzhelian)
Ending International Stage:
Gzhelian
Fraction Up In Ending Stage:
100
Ending Date:
298.89
Description
Conch evolute, with wide umbilicus on young stages, but moderately wide at maturity; no triangular coiling of inner whorls. Growth striae biconvex; longitudinal lirae present, but reticulate ornamentation inconspicuous. Umbilical shoulder nodose during early growth stages, shell surface smooth at maturity. Median saddle almost as high as first lateral saddle; second umbilical lobe weakly trifurcate. Sutural formula E 1 E m E 1 ALU 2v U 2m :U 2d U 1 I [German], (V 1 V 1 ) LU1 U2.2 U2.1 :U2.2 ID [Russian]. Four species. [This genus is similar to Eoschistoceras and may be its senior synonym.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Schistoceratoidea
Family:
Schistoceratidae
Formal Genus Name and Reference:
Paraschistoceras Plummer & SCOTT, 1937, p. 248
Type Species:
Ammonites hildrethi MORTON, 1836, p. 149, OD
Images
(Click to enlarge in a new window)
Fig. 67, 1a-b. *P. hildrethi (Morton), Kansas City, Missouri, USA, Muncie Creek shale, Missourian, × 1.5 (Miller & Furnish, 1940c), FIG. 67, 1c. P. postvenatum (Plummer & Scott), suture, 24 km south of Holdenville, Hughes County, Oklahoma, USA, Wewoka Formation, Desmoinesian, SUI 1962, diameter at approximately 75 mm, × 0.7 (Miller & Furnish, 1958a)
Synonyms
Pintoceras
Geographic Distribution
Russia and Kazakhstan (South Urals), Russia (Siberia), Uzbekistan (Fergana), USA (Illinois, Kansas, Missouri, Ohio, Oklahoma, Pennsylvania, Texas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Kasimovian)
Beginning International Stage:
Kasimovian
Fraction Up In Beginning Stage:
0
Beginning Date:
307.02
Ending Stage in Treatise Usage:
Pennsylvanian (Gzhelian)
Ending International Stage:
Gzhelian
Fraction Up In Ending Stage:
100
Ending Date:
298.89
Description
Conch evolute, with wide umbilicus on young stages, but moderately wide at maturity; no triangular coiling of inner whorls. Growth striae biconvex; longitudinal lirae present, but reticulate ornamentation inconspicuous. Umbilical shoulder nodose during early growth stages, shell surface smooth at maturity. Median saddle almost as high as first lateral saddle; second umbilical lobe weakly trifurcate. Sutural formula E 1 E m E 1 ALU 2v U 2m :U 2d U 1 I [German], (V 1 V 1 ) LU1 U2.2 U2.1 :U2.2 ID [Russian]. Four species. [This genus is similar to Eoschistoceras and may be its senior synonym.]