Panciroli, Elsa, Benson, Roger B J and Butler, Richard J (2018) New partial dentaries of amphitheriid mammal Palaeoxonodon ooliticus from Scotland, and posterior dentary morphology in early cladotherians. Acta Palaeontologica Polonica, 63. ISSN 1732-2421

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Abstract

We describe two partial dentaries of mammals from the Middle Jurassic of Scotland. They belong to the early cladotherian Palaeoxonodon ooliticus. These dentaries comprise the first specimen of P. ooliticus ever found—although its significance was initially unrecognised so it remained undescribed until now—and the most recently discovered specimen, found during fieldwork in 2017. The new specimen preserves part of the coronoid process of the dentary, previously unknown for P. ooliticus, demonstrating the presence of a deep masseteric fossa, with a prominent crest enclosing the fossa anteriorly, and a masseteric foramen, located in the masseteric fossa on the buccal surface of the dentary. On the lingual surface, the mandibular foramen is offset from the Meckel’s sulcus, and positioned below the alveolar plane. These morphologies allow an updated analysis of the phylogenetic position of P. ooliticus, confirming a sister-taxa relationship between Palaeoxonodon and Amphitherium. The position of the mandibular foramen, and the slight extension of the masseteric fossa into the body of the dentary are new autapomorphies for Palaeoxonodon.

Item Type: Article
Additional Information: Forthcoming paper
Uncontrolled Keywords: Mammalia, Cladotheria, Palaeoxonodon ooliticus, Jurassic, Bathonian, Kilmaluag Formation, UK, Scotland.
Subjects: D History General and Old World > DA Great Britain
Q Science > QL Zoology
R Medicine > RK Dentistry
Theme: Understanding the natural world
Department: Natural Sciences
Related URLs:
Depositing User: Ross Anderson
Date Deposited: 31 May 2018 17:15
Last Modified: 31 May 2018 17:15
URI: http://repository.nms.ac.uk/id/eprint/2048

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