Brachiosaurus‭ (‬Arm lizard‭)

Short Info

Brachiosaurus‭ (‬Arm lizard‭)

Phonetic : Brak-he-o-sore-us.

Named By : Elmer S.‭ ‬Riggs‭ ‬-‭ ‬1903

Diet : Herbivore

Size : Estimated 26-30 meters long

Type of Dinosaur : Sauropod

Type Species : B.‭ ‬altithorax (type)

Found in : Algeria, Portugal, Tanzania, USA,‭ ‬Morrison formation

When it Lived : Late Jurassic, 155-140 million years ago

Brachiosaurus (/,braeki@’so:r@sBrachiosaurus (/,braeki@’so’so:) is the genus in the family of sauropod dinosaurs found throughout North America during the Late Jurassic approximately 154-150 millions of years ago. The first time it was described was by American paleontologist Elmer S. Riggs in 1903 using fossils discovered inside the Colorado River valley in the western part of Colorado, United States. Riggs identified the dinosaur as Brachiosaurus altithorax. The general name is Greek meaning “arm lizard”, in reference to the proportionately long arms and the precise name translates to “deep chest”. Brachiosaurus was believed to be between 18 to 21 metres (59 and 69 feet) tall; weight estimates vary between 28.3 to the 58 metric ton range (31.2 to 64 shorter tons). It was characterized by a large neck, a smaller skull, and a large overall dimensions, which are typical of sauropods. In atypical fashion, Brachiosaurus had larger hindlimbs than forelimbs, which resulted in a steeply sloped trunk and a shorter tail.


Brachiosaurus mount
Matt Wedel, CC BY 3.0, via Wikimedia Commons


Brachiosaurus is the name of the genus in the family Brachiosauridae that includes several other similar sauropods. The most well-known depictions of Brachiosaurus are actually inspired by Giraffatitan the Genus of brachiosaurid dinosaurs from the Tendaguru Formation of Tanzania. Giraffatitan was first identified in the work of German paleontologist Werner Janensch in 1914 as an animal species belonging to Brachiosaurus B. brancai. However, it was changed to its own Genus in 2009. Three additional species of Brachiosaurus were named on the basis of fossils found within Africa and Europe The two species are no longer valid while a third been declared a separate genus called Lusotitan.

The most famous example that is B. altithorax is an extremely complete example and only a handful of specimens are believed to belong to the genus, which makes this one of the most rare sauropods from the Morrison Formation. It is considered to be a high-volume browser, perhaps cutting or cropping plants up to 9 meters (30 feet) away from the ground. As with other sauropods was not suited to rearing its hindlimbs. It was used as an illustration of a dinosaur that is most likely an ectothermic animal due to its massive dimensions and the need to have enough food, but more recent studies suggest the animal was warmer-blooded. One of the most famous and originally believed to be among the biggest dinosaurs Brachiosaurus was featured in pop culture including on the screen in 1993’s Jurassic Park.

Source: Wikipedia