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Tetragonites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Lytoceratina
Superfamily:
Tetragonitaceae
Family:
Tetragonitidae
Subfamily:
Tetragonitinae
Formal Genus Name and Reference:
Tetragonites KOSSMAT, 1895, p. 131
Type Species:
Ammonites timotheanus PICTET, 1847, p. 295, OD
Images
(Click to enlarge in a new window)
Fig. 3,3a–c. *T. (T.) timotheanus (PICTET), Upper Albian, Switzerland (Saxonet, Savoyen); a,b, lectotype, Muséum d’Histoire Naturelle de Genève, Pi”GV”/3,1, × 1 (new); c, × 3 (Wiedmann, 1962a, p. 172, fig. 31).——Fig. 3,3d,e. T. (T.) epigonus (KOSSMAT), Campanian, southeastern India (Varagur); lectotype, ×1 (Kossmat, 1895, pl. 17, fig. 4a,b).
Synonyms
Epigoniceras, Eoepigoniceras, Neoepigoniceras, Tingriceras
Geographic Distribution
England, France, Spain, Switzerland, Ukraine (Crimea), Caucasus, Algeria, Tunisia, Angola, South Africa (Zululand), Mozambique, Madagascar, Egypt (Sinai), southeastern India, Tibet, Japan, Sakhalin, New Zealand, Alaska, British Columbia, California, Oregon, Texas, Mexico, Peru, Antarctic Peninsula
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Upper Cretaceous (Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Moderately evolute, whorl section subrectangular, trapezoidal, or rounded, shell smooth or with growth lines only, usually with oblique, prorsiradiate constrictions on internal mold only, with corresponding collars on outside of shell, suture with deep external lobe, several auxiliary saddles, either straight or recurved, and two or more unequal internal saddles
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Lytoceratina
Superfamily:
Tetragonitaceae
Family:
Tetragonitidae
Subfamily:
Tetragonitinae
Formal Genus Name and Reference:
Tetragonites KOSSMAT, 1895, p. 131
Type Species:
Ammonites timotheanus PICTET, 1847, p. 295, OD
Images
(Click to enlarge in a new window)
Fig. 3,3a–c. *T. (T.) timotheanus (PICTET), Upper Albian, Switzerland (Saxonet, Savoyen); a,b, lectotype, Muséum d’Histoire Naturelle de Genève, Pi”GV”/3,1, × 1 (new); c, × 3 (Wiedmann, 1962a, p. 172, fig. 31).——Fig. 3,3d,e. T. (T.) epigonus (KOSSMAT), Campanian, southeastern India (Varagur); lectotype, ×1 (Kossmat, 1895, pl. 17, fig. 4a,b).
Synonyms
Epigoniceras, Eoepigoniceras, Neoepigoniceras, Tingriceras
Geographic Distribution
England, France, Spain, Switzerland, Ukraine (Crimea), Caucasus, Algeria, Tunisia, Angola, South Africa (Zululand), Mozambique, Madagascar, Egypt (Sinai), southeastern India, Tibet, Japan, Sakhalin, New Zealand, Alaska, British Columbia, California, Oregon, Texas, Mexico, Peru, Antarctic Peninsula
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Upper Cretaceous (Maastrichtian)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Moderately evolute, whorl section subrectangular, trapezoidal, or rounded, shell smooth or with growth lines only, usually with oblique, prorsiradiate constrictions on internal mold only, with corresponding collars on outside of shell, suture with deep external lobe, several auxiliary saddles, either straight or recurved, and two or more unequal internal saddles