(Jobar - after a creature in African mythology).
Named By: P.C. Sereno., A.L. Beck, D.B. Dutheil, H.C.E. Larsson, G.H. Lyon, B. Moussa, R.W. Sadleir, C.A. Sidor, D.J. Varricchio, G.P. Wilson & J.A. Wilson - 1999.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Sauropodomorpha, Sauropoda.
Species: J. tiguidensis (type).
Size: Estimated about 21 meters long.
Known locations: Niger, Abaka - Tiouraren Formation.
Time period: Initially considered to be of the Hauterivian to Barremian ages of the early Cretaceous, further study of the sediments at the Tiouraren formation suggest that they actually represent the Bathonian to Oxfordian stages of the mid Jurassic.
Fossil representation: Two individual specimens.
could be said that Jobaria is a sauropod
doesn’t know what it is
due to a mix of different traits. The vertebrae of Jobaria
simple in form which has led to some suggestion that Jobaria
primitive sauropod. Study of other areas however has led to
speculation that Jobaria may actually be a
(sauropods that were built tall rather than long, such as
A study by Paul Sereno regarding
the circumferences of the humerus (upper forelimb bone) and femur
(upper rear limb bone) led to the conclusion that the centre of
gravity for Jobaria was nearer the rear legs,
something that has gone
onto to speculation about Jobaria being able to
rear up its hind legs
so that it could reach higher vegetation.
At eighteen meters long Jobaria was a big dinosaur, but one that lived in the same area as the predator Afrovenator. This relative of Megalosaurus is noted for having proportionately longer arms that may have helped it to grab on to large prey like Jobaria as it delivered bites with its jaws. Juvenile and subadult individuals would have been particularly at risk from this predator.
- Cretaceous sauropods from the Sahara and the uneven rate of skeletal evolution among dinosaurs. - Science 286:1342-1347. - P. C. Sereno, A. L. Beck, D. B. Dutheil, H. C. E. Larsson, G. H. Lyon, B. Moussa, R. W. Sadleir, C. A. Sidor, D. J. Varricchio, G. P. Wilson, and J. A. Wilson. - 1999.