Authors: Daniela Schwarz; Regina Fechner

Source: Canadian Journal of Earth Sciences, Volume 41, Number 10, October 2004 , pp. 1259-1271(13)

Publisher: NRC Research Press

Abstract:

Lusitanisuchus mitracostatus is a small mesoeucrocodilian crocodylomorph from the Upper Jurassic (Kimmeridgian) of Guimarota–Leiria in Portugal, which was originally described as an anguimorph lizard (Lisboasaurus mitracostatus Seiffert, 1970) based on jaw fragments and isolated teeth. A recent reexamination of the crocodylomorph material of Guimarota yielded new skull and dentary remains assignable to Lusitanisuchus mitracostatus. The new skull material not only enables for the first time a skull reconstruction of this taxon, but also leads to renaming and reclassifying Lisboasaurus mitracostatus. Teeth of Lusitanisuchus are also reported from the locality Porto Dinheiro–Lourinhã, Early Cretaceous (Berriasian) of Portugal. The presence of this crocodylomorph taxon in two Portuguese localities suggests its occurence in the Lusitanian Basin during the Kimmeridgian to the Berriasian.

Lusitanisuchus mitracostatus est un petit crocodylomorphe mésoeucrocodilien du Jurassique supérieur (Kimmeridgien) provenant de Guimarota–Leiria, au Portugal; il a été décrit au début comme un lézard anguimorphe (Lisboasaurus mitracostatus Seiffert, 1970) selon des fragments de mâchoire et des dents isolées. Un nouvel examen du matériel crocodylomorphe de Guimarota a donné de nouveaux restes crâniens et dentaires attribuables à Lusitanisuchus mitracostatus. Le nouveau matériel crânien non seulement permet une première reconstruction du crâne de ce taxon, mais conduit à un nouveau nom et à une nouvelle classification de Lisboasaurus mitracostatus. Des dents de Lusitanisuchus sont aussi rapportées en provenance de la localité de Porto Dinheiro–Lourinhã, du Crétacé précoce (Berriasien), au Portugal. La présence de ce taxon crocodylomorphe dans deux localités portugaises suggère son occurrence dans le bassin lusitanien du Kemmeridgien au Berriasien.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2004-10-01

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