Palaeontology, taxonomic revision and variability of some species of the genus Gassendiceras Bert et al., 2006 (Ammonitina, Upper Barremian) from southeastern Franc
作者： Didier Bert , Stéphane Bersac , Gérard Delanoy , Léon Canut
关键词: Ecology 、 Geology 、 Taxonomy (biology) 、 Neoteny 、 Pelagic zone 、 Ammonoidea 、 Paleontology 、 Gassendiceras 、 Ammonite 、 Ammonitina 、 Intraspecific competition
摘要: Bed-by-bed sampling of twelve Barremian sections in southeastern France from pelagic basin (Vocontian Basin) to neritic platforms (Arc Castellane, Arc Nice and Provencal Domain) has enabled the collection of isochronous samples ammonite genus Gassendiceras . Three poorly known species Toxancyloceras vandenheckei Zone (Upper Barremian) are revised: G. alpinum, multicostatum hoheneggeri ; two new described ( rebouleti nov. sp. bosellii sp.). The intraspecific variability particular species was recognised. This is between slender peramorphic robust paedomorphic extreme morphologies, with presence all intermediates.
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