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Polyptychites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Polyptychitidae
Formal Genus Name and Reference:
Polyptychites PAVLOW, 1892, p. 476
Type Species:
Ammonites polyptychus Keyserling, 1846, p. 327, SD ROMAN, 1938, p. 391
Images
(Click to enlarge in a new window)
Fig. 21,3a–c. P. (P.) keyserlingi (N EUMAYR & U HLIG ), Lower Valanginian (keyserlingi Zone), northern Germany; a,b, lectotype, × 0.7; c, × 0.5 (Koenen, 1902).——FIG. 21,3d. P. euomphalus KOENEN, Lower Valanginian (keyserlingi Zone), northern Germany; microconch, ×0.7 (Koenen, 1902).
Synonyms
Geographic Distribution
northern Eurasia, France, ?Mexico, ?California, northern Canada, Greenland
Age Range
Beginning Stage in Treatise Usage:
Lower Valanginian
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
0
Beginning Date:
137.7
Ending Stage in Treatise Usage:
Upper Valanginian
Ending International Stage:
Valanginian
Fraction Up In Ending Stage:
100
Ending Date:
132.6
Description
Moderately involute to very evolute; whorl section rather compressed to depressed, coronate or sphaerocone; more or less prominent, normally oblique umbilical bullae or round tubercles giving rise to 2 or more ribs; some ribs branching once or twice again; ribbing may be virgatotome; inner whorls of some species may have sharp, high, biplicate or triplicate ribs. Suture with 2 or 3 auxiliary lobes.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Polyptychitidae
Formal Genus Name and Reference:
Polyptychites PAVLOW, 1892, p. 476
Type Species:
Ammonites polyptychus Keyserling, 1846, p. 327, SD ROMAN, 1938, p. 391
Images
(Click to enlarge in a new window)
Fig. 21,3a–c. P. (P.) keyserlingi (N EUMAYR & U HLIG ), Lower Valanginian (keyserlingi Zone), northern Germany; a,b, lectotype, × 0.7; c, × 0.5 (Koenen, 1902).——FIG. 21,3d. P. euomphalus KOENEN, Lower Valanginian (keyserlingi Zone), northern Germany; microconch, ×0.7 (Koenen, 1902).
Synonyms
Geographic Distribution
northern Eurasia, France, ?Mexico, ?California, northern Canada, Greenland
Age Range
Beginning Stage in Treatise Usage:
Lower Valanginian
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
0
Beginning Date:
137.7
Ending Stage in Treatise Usage:
Upper Valanginian
Ending International Stage:
Valanginian
Fraction Up In Ending Stage:
100
Ending Date:
132.6
Description
Moderately involute to very evolute; whorl section rather compressed to depressed, coronate or sphaerocone; more or less prominent, normally oblique umbilical bullae or round tubercles giving rise to 2 or more ribs; some ribs branching once or twice again; ribbing may be virgatotome; inner whorls of some species may have sharp, high, biplicate or triplicate ribs. Suture with 2 or 3 auxiliary lobes.