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Valanginites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Olcostephanidae
Formal Genus Name and Reference:
Valanginites KILIAN, 1910c, p. 196
Type Species:
Ammonites nucleus F. A. Roemer, 1841, p. 87 (non Phillips, 1829, p. 174, see ICZN Opinion 1610, 1990), SD ROMAN, 1938, p. 386
Images
(Click to enlarge in a new window)
Fig. 34, 1a, b. *V. nucleus (Roemer), Upper Valanginian, Germany, X (Koenen, 1902).-Fig. 34, 1c, d. V. wilfridi (КаRAKASCH), Upper Valanginian, Bulgaria, X (Nikolov, 1962).
Synonyms
Rotundites
Geographic Distribution
France, Germany, Switzerland, Bulgaria, Ukraine (Crimea), Peru, Argentina
Age Range
Beginning Stage in Treatise Usage:
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
Small, very involute sphaerocones with elliptical umbilicus and oblique, constricted, and collared aperture; ornament ranging from very weak, straight, bundled or bidichotomous ribs with or without slight umbilical bullae to coarse, blunt, concave primary ribs branching at midside, with or without a large tubercle, into 3 to 6 strong secondary ribs; variably with (Dobrodgeiceras) or without large siphonal tubercles on some ribs on later part of body chamber. THIEULOY & GAZAY, 1967; RICCARDI & WESTERMANN , 1970.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Olcostephanidae
Formal Genus Name and Reference:
Valanginites KILIAN, 1910c, p. 196
Type Species:
Ammonites nucleus F. A. Roemer, 1841, p. 87 (non Phillips, 1829, p. 174, see ICZN Opinion 1610, 1990), SD ROMAN, 1938, p. 386
Images
(Click to enlarge in a new window)
Fig. 34, 1a, b. *V. nucleus (Roemer), Upper Valanginian, Germany, X (Koenen, 1902).-Fig. 34, 1c, d. V. wilfridi (КаRAKASCH), Upper Valanginian, Bulgaria, X (Nikolov, 1962).
Synonyms
Rotundites
Geographic Distribution
France, Germany, Switzerland, Bulgaria, Ukraine (Crimea), Peru, Argentina
Age Range
Beginning Stage in Treatise Usage:
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
Small, very involute sphaerocones with elliptical umbilicus and oblique, constricted, and collared aperture; ornament ranging from very weak, straight, bundled or bidichotomous ribs with or without slight umbilical bullae to coarse, blunt, concave primary ribs branching at midside, with or without a large tubercle, into 3 to 6 strong secondary ribs; variably with (Dobrodgeiceras) or without large siphonal tubercles on some ribs on later part of body chamber. THIEULOY & GAZAY, 1967; RICCARDI & WESTERMANN , 1970.