Jobaria
| Jobaria | |
|---|---|
| |
| Skeletons of Jobaria (juvenile) and Suchomimus, two dinosaurs from Niger which did not coexist | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Clade: | †Eusauropoda |
| Genus: | †Jobaria Sereno et al., 1999 |
| Type species | |
| †Jobaria tiguidensis Sereno et al., 1999
| |
Jobaria is a genus of
Description
Jobaria was a primitive sauropod, about 18.2 metres (60 ft) long and estimated to weigh about 22.4 tonnes (24.7 short tons).[2] In 2016 Gregory S. Paul gave a lower estimation of 16 metres (52 ft) and 16 tonnes (18 short tons).[3] Its backbone and tail were simple compared to the complex vertebrae and whiplash tail of the later North America sauropods Diplodocus and Apatosaurus.
It may also have been able to rear up on its hind legs as Paul Sereno concluded, after comparing the ratios of humerus and femur circumferences in Jobaria to extant elephants.[4] The weight distribution of Jobaria indicates that it was supported by the rear limbs rather than the forelimbs (as in elephants) and is speculated that as elephants can rear up, then Jobaria would have been able to more easily.
Discovery
Discovered in the fall of 1997, during a four-month expedition to the Sahara desert led by paleontologist
The genus is named after a local mythical giant beast, Jobar, whose bones some
The sediments in which it was found were originally thought to represent the Hauterivian to Barremian stages of the early Cretaceous Period, dating Jobaria to approximately 132 million years ago.[1] However, re-interpretation of the sediments showed that they are more likely from the Bathonian to Oxfordian stages of the middle Jurassic in age, between 167 and 161 million years ago.[6]
Classification
The phylogenetic relationships of Jobaria are uncertain; it has been interpreted either as a basal macronarian,[7] or as a non-neosauropod eusauropod, basal to the neosauropod clade.[8]
References
- ^ PMID 10558986.
- PMID 24204747.
- ^ Paul, Gregory S. (2016). The Princeton Field Guide to Dinosaurs 2nd Edition. New Jersey: Princeton University Press. pp. 218–219.
- ^ Could Sauropods Rear?
- ^ Sereno, Paul. "Discoveries: Jobaria tiguidensis". Archived from the original on 8 October 2012. Retrieved 25 September 2012.
- .
- ^ Upchurch, P.; Barrett, P. M.; Dodson, P. (2004). "Sauropoda". The Dinosauria (2nd ed.). University of California Press.
- PMID 28480136.
External links
