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[dinosaur] Dinosaur, crocodylomorph and swim tracks from Late Jurassic of Lusitanian Basin




Ben Creisler
bcreisler@gmail.com

A new paper:

Diego Castanera. Elisabete Malafaia. Bruno C. Silva. Vanda F. Santos Â& Matteo Belvedere (2020)
New dinosaur, crocodylomorph and swim tracks from the Late Jurassic of the Lusitanian Basin: implications for ichnodiversity.
Lethaia (advance online publication)
doi: https://doi.org/10.1111/let.12402
https://onlinelibrary.wiley.com/doi/10.1111/let.12402


New dinosaur (theropod and sauropod), crocodylomorph and swim tracks from Upper Jurassic units of the Lusitanian Basin, housed at the Sociedade de HistÃria Natural in Torres Vedras, are here described. They were collected from three different geological formations, the Praia da AmoreiraâPorto Novo (upper Kimmeridgian) and the AlcobaÃa (Kimmeridgianâlower Tithonian) formations in the ConsolaÃÃo Subâbasin and the Freixial Fm. (middleâupper Tithonian) in the Turcifal Subâbasin. Four different theropod morphotypes are identified as follows: cf. Jurabrontes isp., Megalosauripus cf. transjuranicus, Grallatoridae indet. and an indeterminate morphotype (Theropoda indet.) that have affinities with other Therangospodusâlike tracks described in Europe. An indeterminate sauropod track is also identified. These five morphotypes suggest high saurischian dinosaur ichnodiversity, similar to that seen in other European Late Jurassic areas (e.g. the Swiss Jura Mountains), but represent just a portion of the higher diversity exhibited by the osteological record in the Lusitanian Basin. Further, one crocodylomorph pes track identified as Crocodylopodus isp. and swim tracks assigned to Characichnos isp., possibly also produced by crocodylomorphs, are also identified. The newly identified ichnotaxa, together with the older and other recent identifications, indicate ichnodiversity comparable with the richest coeval Upper Jurassic units.

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