Supersaurus was around 108 feet (33 meters) to 112 feet (34 meters) long, and probably weighed something in the region of 35 to 40 tons. While not nearly as heavy as Brachiosaurus, Supersaurus is one of the longest dinosaurs known.
Supersaurus was discovered by Jim Jensen 1979. At the same time, he also discovered what he believed was a second even larger dinosaur, which he unofficially named "Ultrasaurus" (this name was used in some press coverage, but not used in a scientific publication). However, when Jensen published his official scientific description of this second larger dinosaur in 1985, he found that the name "Ultrasaurus", had been already used (and thus had priority) as the name of a different dinosaur discovered by Haang Mook Kim in Korea in 1983. For a time then, Jensen's second dinosaur then became known as "Ultrasauros" (note an "o" instead of the final "u"). Later, however it was found that Ultrasauros was actually a mix of Supersaurus and Brachiosaurus bones. So, today, "Ultrasauros" is considered as a junior synonym for Supersaurus.
Supersaurus (Ultrasauros) was a herbivore (plant-eater) that lived from 154 to 142 million years ago
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