Abstract
The section of Callovian deposits near Uzhovka in the Nizhniy Novgorod region, central Russia, is described. The lower part of Gowerianus Zone of Lower Callovian is subdivided into following faunal horizons (from below): Cadochamoussetia surensis, Cadochamoussetia subpatruus, Cadochamoussetia saratovensis, Chamoussetia chamousseti. The first three horizons comprise the new Subpatruus Subzone.
Conclusions concerning the phyletic line Cadoceras-Cadochamoussetia-Chamoussetia are made on the basis of morphology and stratigraphical distribution of ammonites. The homeomorphic ammonites, earlier partly included in the genus Chamoussetia, are considered. Lower Callovian Eckhardites gen. nov., including two nominal species, E. pavlowi (Smorodina) (=type species), and E. menzeli (Moennig), is probably directly derived from Arctocephalitinae. Upper Callovian species: patruum d’Eichwald, galdrinum sensu Nikitin, funiferum Phillips presumably derived from Middle Callovian Rondiceras ex gr. milaschevici.
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Mitta, V.V. (1999). The Genus Cadochamoussetia in the Phylogeny of the Jurassic Cardioceratidae (Ammonoidea). In: Olóriz, F., Rodríguez-Tovar, F.J. (eds) Advancing Research on Living and Fossil Cephalopods. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4837-9_10
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DOI: https://doi.org/10.1007/978-1-4615-4837-9_10
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