Magyarosaurus dacus
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Magyarosaurus Temporal range: Late Cretaceous, 70–66 Ma |
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| Humerus, Deva Natural History Museum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Dinosauria |
| Order: | Saurischia |
| Suborder: | †Sauropodomorpha |
| Clade: | †Neosauropoda |
| Clade: | †Macronaria |
| Clade: | †Titanosauria |
| Family: | †Nemegtosauridae |
| Genus: |
†Magyarosaurus von Huene, 1932 |
| Type species | |
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Magyarosaurus dacus (Nopcsa, 1915 [originally Titanosaurus dacus]) |
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| Synonyms | |
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M. hungaricus von Huene, 1932 |
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M. hungaricus von Huene, 1932
M. transsylvanicus von Huene, 1932
Magyarosaurus ("Magyar lizard") is a genus of dwarf sauropod dinosaur from late Cretaceous Period (early to late Maastrichtian) in Romania. It is one of the smallest-known adult sauropods, measuring only six meters in length. The type species is Magyarosaurus dacus. Magyarosaurus was found to be a close relative of Rapetosaurus in the family Saltasauridae in the sauropod clade Titanosauria in a 2005 study of the titanosaurs by Kristina Curry Rogers.
Magyarosaurus was estimated to be 1.1 metric tons (1.1 long tons; 1.2 short tons) in weight. It carried strange dermal armour. The estimated length of Magyarosaurus is 6 metres (20 ft), according to Curry Rogers et al.. In 2010 Gregory S. Paul gave lower estimations of one tonne with the same length.
Stein et al. (2010) found that none of Magyarosaurus close relatives had a reduced size. That means, for its clade, its small size therefore is a distinguishing autapomorphy.
A distal caudal vertebrae was named M. sp. by Codrea et al. (2008). It was probably from near the middle of the tail as it has transitional features. Before it was definitively buried, the neural arch was broken off, probably by repositioning of the vertebrae from its original position. Its centrum is elongated, and measures 105 millimetres (4.1 in) long. Both sides that would have articulated with vertebrae were severely damaged. It is assigned to Magyarosaurus on the basis that no other sauropods are known from the region it was found in, and the fact that it is located between the two vertebrae compared with it because of its intermediate morphology.
Remains belonging to at least ten individuals have been recovered from the Hunedoara region (Sânpetru Formation) in the area which was during their discovery Hungary, but is now western Romania. Initially they were named Titanosaurus dacus, the specific name referring to the Dacians (who had lived in that place about 2000 years ago), by Baron Nopcsa in 1915. Nopcsa had collected fossils in the area since 1895. The species was later renamed Magyarosaurus dacus by Friedrich von Huene in 1932. von Huene in 1932 also named two other species: M. hungaricus and M. transsylvanicus. Larger, rarer M. hungaricus may represent a distinct taxon.
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