Some rare helical Ammonoidea from the lower Aptian (Lower Cretaceous) of the Paris Basin (NE France) |
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| Affiliation: | 1. Laboratoire du groupe de recherche en paléobiologie et biostratigraphie des Ammonites, Bois-Mésanges, quartier Saint-Joseph, 04170 La Mure-Argens, France;2. Réserve naturelle géologique de Haute-Provence, service environnement, Conseil départemental des Alpes de Haute-Provence, 13, rue du Docteur-Romieu, CS 70216, 04995 Digne-les-Bains cedex 9, France;3. Laboratoire géosciences, UMR-CNRS 6118, université de Rennes-1, campus Beaulieu, bâtiment 15, 35042 Rennes cedex, France;1. Llorenç de Villalonga, 17B, 1-1, 43007 Tarragona, Catalonia;2. Department of Geology, Faculty of Sciences, University of Isfahan, 81746 Isfahan, Iran;1. Geology Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt;2. Geology Department, Faculty of Science, Damietta University, New Damietta, Egypt;1. Anthropological Survey of India, Kolkata; Palaeo Research Society, IPH Colony, Ghumarwin, 174021 Himachal Pradesh, India;2. Department of Zoology University of Sialkot, Sialkot, Pakistan;3. Dr. Abu Bakr Fossil Display & Research Centre, Institute of Zoology, University of the Punjab, Lahore, Punjab, Pakistan;4. Department of Zoology, University of Okara, Okara, Punjab, Pakistan;5. Pakistan Museum of Natural History, Garden Avenue, Shakarparian, Islamabad, Pakistan;1. CNRS (UMR 8538), Laboratoire de Géologie, École Normale Supérieure, PSL Research University, 24, rue Lhomond, 75231 Paris cedex 05, France;2. 82, rue Pierre Brossolette, 92320 Châtillon, France;3. Palaeontological Research and Education Centre, Maha Sarakham University, Maha Sarakham 44150, Thailand;1. Université Moulay Ismail, Faculté des sciences, Département de géologie, BP 11.201, Zitoune, Meknès, Maroc;2. University of Silesia in Katowice, Faculty of Natural Sciences, Institute of Earth Sciences, Bedzinska Street 60, 41-200 Sosnowiec, Poland;3. Université Hassan II Mohammedia, Faculté des sciences de Ben M''Sik, avenue Cdt Driss El Harti, BP 7955, Ben M''Sik 20.800, Casablanca, Maroc;4. Université Moulay Ismail, Faculté des sciences et Techniques d’Errachidia, BP 509, Boutalamine, Errachidia, Maroc |
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| Abstract: | In the present paper, we describe and figure some rare lower Aptian (Lower Cretaceous) helical ammonoids from the Deshayesites deshayesi Zone of the Argiles à Plicatules Formation (Paris Basin, NE France). Those are the only helical ammonoids known in this zone so far. They were only occasionally evoked in literature and this is probably on the basis of the specimens here described that, according to us, the genus Toxoceratoides (Helicancylidae) was wrongly regarded as possessing an early helical spiral part. We demonstrate here that these specimens are not belonging to Toxoceratoides nor Helicancylidae: they are interpreted as ‘abnormally’ helical representatives of the genus Ancyloceras (Ancyloceratidae) or a new taxon of Ancyloceratidae. |
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| Keywords: | Helical ammonoids Paris Basin Aptian Ancyloceratidae Ammonites hélicoïdales Bassin de Paris Aptien Ancyloceratidae |
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