Specialization and iterative evolution of some Western Tethyan Bathonian ammonites [ Benatinites (B.) nov., B. (Lugariceras) nov. and  Hemigarantia]

Late Bajocian to Early Bathonian ammonites, now attributed to Benatinites and Lugariceras, and Late Bathonian Hemigarantia, previously considered as cryptogenic taxa, share very similar sutural and ornamentation characters, suggesting their derivation from the stephanoceratid stock, most probably fr...

Full description

Saved in:
Bibliographic Details
Published in:Geobios 2006-01, Vol.39 (1), p.113-124
Main Authors: Schlögl, Jan, Elmi, Serge, Rakús, Miloš, Mangold, Charles, Ouahhabi, Mohammed
Format: Article
Language:English
Subjects:
Ammonites
Bathonian
Bathonien
Earth Sciences
Earth, ocean, space
Exact sciences and technology
Invertebrate paleontology
Iterative evolution
Jurassic
Jurassique
Paleontology
Sciences of the Universe
Specialization
Spécialisation
Stratigraphy
Téthys occidentale
Western Tethys
Évolution itérative
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Late Bajocian to Early Bathonian ammonites, now attributed to Benatinites and Lugariceras, and Late Bathonian Hemigarantia, previously considered as cryptogenic taxa, share very similar sutural and ornamentation characters, suggesting their derivation from the stephanoceratid stock, most probably from the Cadomites–Polyplectites line. The palaeogeographical distribution of these taxa is limited to the North-Western African and European margins of Western Tethys. Palaeontologically, they represent the result of the iterative evolution rather than a poorly known lineage. Les ammonites du Bajocien supérieur et du Bathonien inférieur ici attribuées à Benatinites et à Lugariceras et les Hemigarantia du Bathonien supérieur, étaient considérées comme des taxons cryptogénétiques. Ils ont en commun les même sutures et caractères d'ornamentation, ce qui suggère une dérivation à partir d'un stock de Stephanoceratidae et plus probablement de la lignée dimorphe Cadomites–Polyplectites. La distribution paléogéographique de cette faune est limitée aux marges nord-ouest africaine et européenne de la Téthys occidentale. D'un point de vue paléontologique, elle exprime plutôt le résultat d'une évolution itérative qu'une lignée mal documentée.
ISSN:0016-6995
DOI:10.1016/j.geobios.2004.03.007