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Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 First Overview on the Nautiloids from the Pliensbachian and the Toarcian of the Iberian Peninsula (Portugal and Spain) F. Barroso-Barcenilla 1,2 M.J. Comas-Rengifo 1 , L.V. Duarte 3 , A. Goy 1 , G. Martínez 1 1. Departamento de Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid. 28040 Madrid, España Spain (E-mail: fbarroso@geo.ucm.es) 2. Departamento de Geología, Facultad de Ciencias, Universidad de Alcalá de Henares. 28871 Alcalá de Henares, España - Spain 3. Departamento de Ciências da Terra and IMAR-CMA. Faculdade de Ciências e Tecnologia. Universidade de Coimbra. 3000-272 Coimbra, Portugal During the Early Jurassic, the current Iberian Peninsula was a relatively independent tectonic unit, named Iberian Subplate. Its particular structural layout and its privileged palaeogeographical location enabled that the eustatic cycles were registered in several epicontinental flooded regions of the Iberian Subplate (e.g. the Basque-Cantabrian and the Iberian basins, Spain; and the Lusitanian Basin, Portugal), containing both Boreal fauna, coming from the Protoatlantic Ocean, and Meridional fauna, arrived from the Tethys Sea. Likewise, as these basins constituted relatively confined environments, endemic fauna arose in their waters as well. Among this rich and diverse fauna, numerous nautiloids from the Pliensbachian and the Toarcian of the Iberian Peninsula have been collected and studied. Historically, the nautiloids arisen during the radiation of the Early Jurassic that followed the mass extinction of the end-Triassic have been notably difficult to classify and to group. Most of them have been assigned initially to the genus Nautilus Linneo, 1758, and subsequently to Cenoceras Hyatt, 1883. This genus, originally considered as a unity (e.g. Kummel, 1956), has been subsequently divided into several subgenera (e.g. Tintant, 1984). At present, a tendency to rehabilitate other genera or to describe new ones predominates among the few authors who try to classify and to group in a logical and practical system these controversial cephalopods (e.g. Chirat, 1997; Rulleau, 2008; Barroso-Barcenilla et al., 2010). As first conclusions it can be indicated that, as a whole, the nautiloids from the Pliensbachian and the Toarcian of the Iberian Peninsula are extremely scarce (
Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 the Museum of Comparative Zoology, 1956, 114: 324-494. Martínez G., Rábano I. La colección de nautiloideos jurásicos del Museo Geominero (ITGE, Madrid). Temas Geológico-Mineros, 1999, 26: 415-423. Mouterde R., Rocha R.B. Atlas des fossiles caractéri- stiques du lias portugais, 1 (Lias inférieur). Ciências da Terra (UNL), 1981, 6: 49-76. Rulleau L. Les Nautiles du Lias et du Dogger de la Région lyonnaise. Section Géologie et Paléon- tologie du Comité d´Entreprise Lafarge Ciments, Lozanne, 2008: 149. Tintant H. Contribution à la connaissance des nauti- lacés jurassiques, 1: Le genre Cenoceras Hyatt dans le Lias du Sud-est de la France. Géologie de la France, 1984, 1-2: 29-66. Tintant H. Origine et différentiation des Nautilacés au Lias. Cahiers de l´Université Catholique de Lyon, 1990, 4: 127-151. Tintant H., Courbouleix S. Description de quelques Nautilides du Lias Portugais. Comunicaçoes dos Servicios Geológicos de Portugal, 1974, 57: 245- 260. 163
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