The osteology of Magnosaurus nethercombensis (Dinosauria, Theropoda) from the Bajocian (Middle Jurassic) of the United Kingdom and a re-examination of the oldest records of tetanurans

Benson, R. B. J. (2010) The osteology of Magnosaurus nethercombensis (Dinosauria, Theropoda) from the Bajocian (Middle Jurassic) of the United Kingdom and a re-examination of the oldest records of tetanurans. Journal of Systematic Palaeontology, 8 (1). pp. 131-146. ISSN 1477-2019 print / 1478-0941 online DOI 10.1080/14772011003603515

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Abstract

Magnosaurus nethercombensis from the Lower Bajocian (Middle Jurassic) of Dorset, UK is a valid species, possessing a single autapomor phy: the presence of anteroposteriorly elongate foramina, inclined anterodorsally and located ventrally on the lateral surface of the dentary. It is the oldest known definite tetanuran dinosaur and shows two tetanuran features: a reduced ischial peduncle of the ilium and the presence of a marked femoral extensor groove. Other records of putative early tetanurans are reviewed: ‘Zanclodon cambrensis’ from the Rhaetian of Wales; remains from the Norian–Hettangian of Switzerland; Shuvosaurus and Protoavis from the Norian of Texas; Eshanosaurus from the Hettangian of China; theropod remains originally included in the syntype series of Scelidosaurus from the Hettangian–Sinemurian of England; a fragmentary skeleton from the Sinemurian of Italy; Cryolophosaurus from the Sinemurian–Pliensbachian of Antarctica; the partial skeleton of a small theropod from the Toarcian of Morocco; and the lost syntype material of ‘Streptospondylus cuvieri’ from the Toarcian of Whitby. None of these records can be confidently considered to be the earliest tetanuran record. An early Middle Jurassic age for the earliest-known tetanuran is more consistent with a restricted content of Ceratosauria, comprising Ceratosaurus, Elaphrosaurus, and abelisauroids, than with a wider content including coelophysoids, due to reduction in the length of phylogenetic ghost lineages.

Item Type: Article
Uncontrolled Keywords: 09AREP; IA60;
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: Journal of Systematic Palaeontology
Volume: 8
Page Range: pp. 131-146
Identification Number: 10.1080/14772011003603515
Depositing User: Sarah Humbert
Date Deposited: 16 Mar 2010 11:12
Last Modified: 23 Jul 2013 09:56
URI: http://eprints.esc.cam.ac.uk/id/eprint/1341

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