Thursday, November 11, 1999 Published at 18:59 GMT
'Striking' dinosaurs found in Sahara
Jobaria: Long-necked and broad-toothed
Two new dinosaur species have been discovered. The creatures are both sauropods - the group of giant plant-eaters that includes the well-known Diplodocus and Brachiosaurus.
One of the newly-discovered species, Jobaria tiguidensis, is a long-necked, broad-toothed creature that is "strikingly primitive" for a sauropod that appeared quite late - about 130 to 140 million years ago - in dinosaur history.
University of Chicago palaeontologist Paul Sereno, whose team dug the creature out of the Sahara desert in the Republic of Niger, said the fossilised bones represent a particularly fine dinosaur specimen.
"With 95% of its skeleton preserved, the new species stands as the most complete long-necked dinosaur ever discovered from the Cretaceous period," he said.
Jobaria refers to "Jobar," a creature in the legends of the local Tuareg nomads; tiguidensis refers to a cliff near to where Paul Sereno and his colleagues made their discovery.
The desert we know today would not have existed in Jobaria's day - the animal would have populated an area covered by open forests and broad rivers.
However, some may have died at the hands of the chief meat-eating dinosaur of the time, Afrovenator, an eight-metre (27-foot) long predator previously discovered in the same area by Sereno's team. Tooth marks are present on the ribs of one of the juvenile skeletons.
The team think Jobaria probably represents an ancient sauropod lineage that survived and flourished only in Africa during the Cretaceous.
The other dinosaur announced by the team is one of the smallest sauropods ever found, with a maximum body length of about 15 metres (49 ft). The dinosaur has been given the name Nigersaurus taqueti>. Despite its relatively small overall size, it still had a big mouth with over 600 teeth and an unusual snout.
The team had to rely on a number of incomplete specimens to build up a picture of this creature.
The National Geographic Society has sponsored the dinosaur research which has been published in the journal Science. The society has made a full-size cast of an adult and a juvenile Jobaria for its Explorers Hall museum in Washington. The adult stands about 10-metres (32 ft) high.