Mirischia

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Mirischia
Graphic representation of Mirischia

Graphic representation of Mirischia

Temporal occurrence
Lower Cretaceous ( Albium )
112.9 to 100.5 million years
Locations
Systematics
Dinosaur (dinosauria)
Lizard dinosaur (Saurischia)
Theropoda
Tetanurae
Compsognathidae
Mirischia
Scientific name
Mirischia
Naish et al. 2004
Art
  • Mirischia asymmetrica

Mirischia asymmetrica was a relatively small dinosaur with a total length of about 2 meters, which isassigned tothe Compsognathidae . It was discovered in the Romualdo strata of the Santana Formation in Brazil and accordingly comes from the Lower Cretaceous ( Albium ).

The fossil found consisted of a complete pelvis and parts of the hind legs. The peculiarities of the basin are sufficient to distinguish Mirischia asymmetrica as a new species from other theropods , especially the Santana raptor found in the same formation .

Comparative phylogenetic studies suggest a close relationship with the European Compsognathus from the Upper Jurassic and Aristosuchus from the Lower Cretaceous England.

features

Mirischia is mainly due to its asymmetric ischial in (ischium). The left side has an oval window while the right side is marked by a notch in the same position. In addition to this feature, the fossil is unusual in that it is likely that some of the animal's soft tissue has also been preserved. There are parts between the seat and the pubis that are interpreted as the remains of air sacs . This would confirm the theory that non-avian theropods also had pneumatized bones and air sacs.

Naming

The naming of mirischia was carried out by "Mir" - the Latin word for "wonderful" - and "Ischia" after the ischial, so the generic name is "Wonderful ischial" and the species name "Wonderful pool." Asymmetrica derives from asymmetric ischial .

literature

  • Darren Naish, David M. Martill, Eberhard Frey : Ecology, Systematics and Biogeographical Relationships of Dinosaurs, Including a New Theropod, from the Santana Formation (? Albian, Early Cretaceous) of Brazil. In: Historical Biology. Vol. 16, No. 2, 2004, ISSN  0891-2963 , pp. 57-70, doi : 10.1080 / 08912960410001674200 .

Individual evidence

  1. ^ Gregory S. Paul : The Princeton Field Guide To Dinosaurs. Princeton University Press, Princeton NJ 2010, ISBN 978-0-691-13720-9 , p. 123, online .