The youngest record of metriorhynchid crocodylomorphs,with implications for the extinction of Thalattosuchia期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The youngest record of metriorhynchid crocodylomorphs,with implications for the extinction of Thalattosuchia

Institution:	1. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Via A. Longo, 19, I-95128 Catania, Italy;2. Grant Institute, School of GeoSciences, The King''s Buildings, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, United Kingdom;3. School of Ocean and Earth Science, National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, United Kingdom;4. Museo Civico di Storia Naturale, Via degli Studi 9, 97013 Comiso, Ragusa, Italy;5. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Alma Mater Studiorum, Università di Bologna, Via Zamboni, 67, 40126 Bologna, Italy;6. Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso, 35, 10125 Torino, Italy;7. Istituto di Geoscienze e Georisorse CNR, 56124 Pisa, Italy;1. ITT Fossil, Instituto Tecnológico de Micropaleontologia, Universidade do Vale do Rio dos Sinos (UNISINOS), Av. UNISINOS, 950, B. Cristo Rei/CEP: 93.022-000, São Leopoldo, RS, Brazil;2. Instituto Antártico Argentino (IAA), Buenos Aires, Argentina;3. IDEAN-CONICET, Departamento de Ciências Geológicas, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428, Buenos Aires, Argentina;4. Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UK;5. Museu Nacional – Universidade Federal do Rio de Janeiro, Brazil;1. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470 (C1405DJR), Buenos Aires, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET);3. División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina;4. Fundación de Historia Natural “Félix de Azara”, Universidad Maimónides, Hidalgo 775 (C1405BDB), Buenos Aires, Argentina;5. Dirección Nacional del Antártico - Instituto Antártico Argentino, Cerrito 1248, Buenos Aires 1010, Argentina;1. Grupo Aragosaurus-IUCA, Departamento de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009, Zaragoza, Spain;2. Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, C/ Escola Industrial 23, E-08201, Sabadell, Spain;3. Department of Earth and Environmental Sciences, University of Iowa, 52242, Iowa City, USA;1. Laboratoire de géologie de Lyon, terre, planète, environnement, UMR CNRS 5276 (CNRS, ENS, université Lyon 1), École normale supérieure de Lyon, 69364 Lyon cedex 07, France;2. Sorbonne universités – CR2P – MNHN, CNRS, UPMC–Paris-6, Muséum national d’Histoire naturelle, 57, rue Cuvier, CP 38, 75231 Paris cedex 05, France

Abstract:	Here we describe an isolated tooth of a metriorhynchid crocodylomorph from the Hybla Formation (Aptian, Lower Cretaceous) of Rocca Chi Parra quarry (Montagna Grande, Calatafimi, Trapani Province), Sicily, Italy. The specimen shares with the Upper Jurassic taxon Plesiosuchus manselii a mediolaterally compressed conical tooth crown, noticeable lingual curvature, mesial and distal carinae with microscopic, rectangular contiguous denticles, strong distal curvature of the mesial margin, and the presence of weak 'carinal flanges' on the labial and lingual surfaces (which are preeminent at the mid-crown). This suite of morphologies is also present in an unnamed Valanginian (Lower Cretaceous) plesiosuchinan from France. However, the Sicilian tooth differs from these taxa in having more pronounced carinae, and faint apicobasally aligned enamel ridges. It also differs from P. manselii in having more extensive 'carinal flanges' on the labial surface. The specimen extends the known geological range of Metriorhynchidae and Thalattosuchia by approximately 7–8 million years. This overturns previous hypotheses of Metriorhynchidae becoming extinct early in the Early Cretaceous.

Keywords:	Aptian Cretaceous Plesiosuchina Sicily Hybla formation BRSMG"} {"#name":"keyword" "$":{"id":"kwrd0040"} "$$":[{"#name":"text" "_":"Bristol City Museum and Art Gallery Bristol England United Kingdom JJCC"} {"#name":"keyword" "$":{"id":"kwrd0050"} "$$":[{"#name":"text" "_":"Jean-Jacques Cornée personal collection Fontvieille France MJML"} {"#name":"keyword" "$":{"id":"kwrd0060"} "$$":[{"#name":"text" "_":"Museum Jurassic Marine Life Kimmeridge England United Kingdom MSNC"} {"#name":"keyword" "$":{"id":"kwrd0070"} "$$":[{"#name":"text" "_":"Museo di Storia Naturale di Comiso (Comiso Natural History Museum) Comiso Italy NHMUK"} {"#name":"keyword" "$":{"id":"kwrd0080"} "$$":[{"#name":"text" "_":"Natural History Museum London England United Kingdom SMNS"} {"#name":"keyword" "$":{"id":"kwrd0090"} "$$":[{"#name":"text" "_":"Staatliches Museum für Naturkunde Stuttgart Germany
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