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Lusitanisuchus
''Lusitanisuchus'' is an extinct genus of mesoeucrocodylian crocodylomorph. Mostly fragmentary fossils have been found from several localities in Portugal and are Late Jurassic and Early Cretaceous in age.
The type and only species, ''Lusitanisuchus mitracostatus'', was named in 2004 after having previously been described as a species of the genus ''Lisboasaurus''.〔Schwarz, D. and Fechner, R. (2004). ''Lusitanisuchus'', a new generic name for ''Lisboasaurus mitracostatus'' (Crocodylomorpha: Mesoeucrocodylia), with a description of new remains from the Upper Jurassic (Kimmeridgian) and Lower Cretaceous (Berriasian) of Portugal. ''Canadian Journal of Earth Science'' 41(10):1259–1271.〕 ''L. mitracostatus'' was originally thought to have been an anguimorph lizard upon its naming in 1970 based on fragmentary jaw remains and isolated teeth found from the Kimmeridgean-age Guimarota Formation in Leiria . The species was later regarded as a ''nomen dubium'' by several authors of papers regarding ''Lisboasaurus'' due to the incomplete nature of the known remains associated with the species.〔Milner, A. R. and Evans, S. E. (1991). The Upper Jurassic diapsid ''Lisboasaurus estesi'' — a maniraptoran theropod. ''Palaeontology'' 34:503–513.〕〔Buscalioni, A. D., Ortega, F., Pérez-Moreno, B. P., and Evans, S. E. (1996). The Upper Jurassic maniraptoran theropod ''Lisboasaurus estesi'' (Guimarota, Portugal) reinterpreted as a crocodylomorph. ''Journal of Vertebrate Paleontology'' 16(2):358–362.〕 However, a later reexamination of fossils from the Guimarota Formation had found skull material that included a dentary similar to the one seen in the holotype of ''L. mitracostatus''. These remains, being more complete than those of the holotype, showed that ''L. mitracostatus'' was really a crocodylomorph rather than an anguimorph. Furthermore, it was shown to be a genus distinct from ''Lisboasaurus'', which had by then been shown to be a crocodylomorph as well.
Several teeth referable to ''Lusitanisuchus'' were also found from Porto Dinheiro, Lourinhã in strata deposited during the Berriasian stage of the Early Cretaceous, extending the temporal range of this taxon by about 15 Ma.
==Paleobiology==
''Lusitanisuchus'' coexisted with many dinosaurs from the Lusitanian Basin during the Late Jurassic and Early Cretaceous. Dinosaur fossils found from the Guimarota Formation include tyrannosauroids such as ''Aviatyrannis'' and ''Stokesosaurus'', the ornithopod ''Phyllodon'', and the small coelurosaur ''Compsognathus''.〔Weishampel, D. B., Barret, P. M., Coria, R. A., Loeuff, J. L., Xing, X., Xijin, Z., Sahni, A., Gomani, E. M. P. and Noto, C. R. (2004). "Dinosaur distribution". ''In:'' Weishampel, D, B., Dodson, P. and Osmólska, H., eds., ''The Dinosauria'', 2nd ed. Berkeley: University of California Press. Pp. 545–549.〕 The Porto Dinheiro locality included dinosaurs such as the diplodocid ''Dinheirosaurus'' as well as early mammals such as ''Portopinheirodon''.〔Bonaparte, J. F. and Mateus, O (1999). A new diplodocid, ''Dinheirosaurus lourinhanensis gen. et sp. nov.'', from the Late Jurassic beds of Portugal. ''Revista del Museo Argentino de Ciencias Naturales'' 5:13–29.〕
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