Young, Mark T, Hua, Stéphane, Steel, Lorna, Foffa, Davide, Brusatte, Stephen L (Research Associate), Thüring, Silvan, Mateus, Octávio, Ruiz-Omeñaca, José Ignacio, Havlik, Philipe, Lepage, Yves and Brandalise De Andrade, Marco (2014) Revision of the Late Jurassic teleosaurid genus Machimosaurus (Crocodylomorpha, Thalattosuchia). Royal Society Open Science. ISSN 2054-5703

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Abstract

Machimosaurus was a large-bodied genus of teleosaurid crocodylomorph, considered to have been durophagous/chelonivorous, and which frequented coastal marine/estuarine ecosystems during the Late Jurassic. Here, we revise the genus based on previously described specimens and revise the species within this genus. We conclude that there were three European Machimosaurus species and another taxon in Ethiopia. This conclusion is based on numerous lines of evidence: craniomandibular, dental and postcranial morphologies; differences in estimated total body length; geological age; geographical distribution; and hypothetical lifestyle. We re-diagnose the type species Machimosaurus hugii and limit referred specimens to only those from Upper Kimmeridgian–Lower Tithonian of Switzerland, Portugal and Spain. We also re-diagnose Machimosaurus mosae, demonstrate that it is an available name and restrict the species to the uppermost Kimmeridgian–lowermost Tithonian of northeastern France. We re-diagnose and validate the species Machimosaurus nowackianus from Harrar, Ethiopia. Finally, we establish a new species, Machimosaurus buffetauti, for the Lower Kimmeridgian specimens of France and Germany (and possibly England and Poland). We hypothesize that Machimosaurus may have been analogous to the Pliocene–Holocene genus Crocodylus in having one large-bodied taxon suited to traversing marine barriers and additional, geographically limited taxa across its range.

Item Type: Article
Uncontrolled Keywords: Africa, Europe, Kimmeridgian, Machimosaurus, Teleosauridae, Tithonian
Subjects: D History General and Old World > D History (General) > D901 Europe (General)
D History General and Old World > DT Africa
Q Science > QE Geology
Q Science > QL Zoology
Theme: Understanding the natural world
Department: Natural Sciences
Related URLs:
Depositing User: Ross Anderson
Date Deposited: 17 Sep 2018 14:12
Last Modified: 09 Oct 2018 15:46
URI: http://repository.nms.ac.uk/id/eprint/2104

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