Quilmesaurus facts for kids
Quick facts for kids QuilmesaurusTemporal range: Late Cretaceous
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Quilmesaurus
Coria, 2001
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Q. curriei Coria, 2001 (type) |
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Quilmesaurus was a predatory dinosaur from the Cretaceous period. It lived 95 million years ago.
Description
The preserved portion of femur is robust and boxy in shape. The rear face of the tip of the bone possessed prominent condyles (joint bumps) for connecting to the tibia (on the inner face of the leg) and fibula (on the outer face of the leg). The lateral condyle (which connected to the fibula) is slightly lower from front-to-back compared to the medial condyle (which connected to the tibia), but it is also wider from side-to-side. An additional finger-like bone spur (an epicondyle) would have also been present on the lateral condyle, although this spur is broken off in the only known Quilmesaurus femur. Just above the medial condyle is a low yet noticeable ridge which juts away from the rest of the bone, towards the midline of the animal's body. This ridge is known as a mesiodistal crest. The area immediately above the condyles possesses a shallow yet wide lowered area known as an extensor groove. Overall the femur is almost identical to that of other abelisaurids.
The proximal (upper or innermost) part of the tibia possesses a myriad of complex features. A large and hatchet-shaped structure known as a cnemial crest points forwards at the proximal portion of the tibia. The tip of the cnemial crest is hooked due to the presence of a downward pointing spur, known as a ventral process. Although Coria (2001) considered a hooked cnemial crest to be unique to Quilmesaurus, Valieri et al. (2007) noted that this structure was also possessed by Aucasaurus and Majungasaurus, as well as the ambiguous abelisaurid Genusaurus. The distal part of the tibia possesses its own projections for connecting to ankle bones, known as malleoli. This part has the form of an asymmetrical triangle when seen from the front, with the massive lateral malleolus projecting further distally than the smaller medial malleolus. This combination of distal tibia features was also once presumed to have been unique to Quilmesaurus. However, Valieri et al. (2007) note that the distal tibia of Rajasaurus was very similar to that of Quilmesaurus.
In 2016, Quilmesaurus was estimated to have measured 5.3 metres (17 ft) in length. This would have made it among the smallest derived abelisaurids, although its legs were proportionally robust like those of Pycnonemosaurus, one of the largest members of the family.
Images for kids
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Quilmesaurus preying on Bonapartesaurus, while an Austroraptor group watches
See also
In Spanish: Quilmesaurus curriei para niños
