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Re: Decuriasuchus, new "gregarious" rauisuchian from Brazil



Wow, if these hunted in packs, no sympatric tetrapod in the Triassic was safe.

2011/4/1 bh480@scn.org <bh480@scn.org>:
> From: Ben Creisler
> bh480@scn.org
>
> I hesitate to post any serious story links today, but this one IS legit.
>
> Marco Aurélio G. Franca, Jorge Ferigolo and Max C. Langer (2011)
> Associated skeletons of a new middle Triassic “Rauisuchia” from Brazil.
> Naturwissenschaften (advance online publication)
> DOI: 10.1007/s00114-011-0782-3
> http://www.springerlink.com/content/431nmk50220u113q/
>
> For more than 30 million years, in early Mesozoic Pangea, “rauisuchian”
> archosaurs were the apex predators in most terrestrial ecosystems, but
> their biology and evolutionary history remain poorly understood. We
> describe a new “rauisuchian” based on ten individuals found in a single
> locality from the Middle Triassic (Ladinian) Santa Maria Formation of
> southern Brazil. Nine articulated and associated skeletons were discovered,
> three of which have nearly complete skulls. Along with sedimentological and
> taphonomic data, this suggests that those highly successful predators
> exhibited some kind of intraspecific interaction. Other monotaxic
> assemblages of Triassic archosaurs are Late Triassic (Norian-Rhaetian) in
> age, approximately 10 million years younger than the material described
> here. Indeed, the studied assemblage may represent the earliest evidence of
> gregariousness among archosaurs, adding to our knowledge on the origin of a
> behavior pattern typical of extant taxa.
>
> The name "Decuria" comes from the Roman term for a body of 10 soldiers.
>
> There are number of news stories in Portuguese about the find, some with a
> photo:
>
> http://noticias.uol.com.br/ultnot/cienciaesaude/ultimas-noticias/2011/03/31/
> anunciada-descoberta-de-predador-mais-antigo-que-dinossauros-no-rs.jhtm
>
> http://www.bemparana.com.br/index.php?n=176389&t=brasileiros-anunciam-descob
> erta-de-predador-mais-antigo-que-dinossauros
>
>
> http://www.diariodecanoas.com.br/site/noticias/geral,canal-8,ed-60,ct-214,cd
> -312595.htm
>
>
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