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Name: »Rayoso lizard«
Length: 6 – 7 m
Height: 1, 8 m
Weight: 4 tons
Diet: herbivore
Time: Cretaceous (99 MYA)
Location: South America (Argentina)

Rayososaurus is a genus of plant-eating sauropod dinosaur of the superfamily Diplodocoidea. It was found in the Rayoso Formation, in Patagonia, Argentina and lived about 99 million years ago (during the Early Cretaceous). The type species is R. agrionensis.
There is some debate whether Rayososaurus is indeed a separate genus. However, morphological and temporal differences tend to support its claim. Fossil finds are only a scapula, femur and part of fibula. The racket-shaped scapula is characteristic of the Rebacchisauridae.
The fossils found in Africa Rebbachisaurus are almost identical to those of Rayososaurus. This is interpreted as evidence for the existence of a land bridge between Africa and South America during the Cretaceous. One of the two species then evolved seperatly from the other, when they immigrated to a new land mass.

A fully grown specimen reached an estimated length of 6 to 7 meters and a weight of  about 4 tons.

Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Superfamily: Diplodocoidea
Family: Rebbachisauridae
Genus: Rayososaurus
Species: R. agrionensis Bonaparte, 1995

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