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Amargasaurus(um-arg-uh-soar-uhs) was a genus of dicraeosaurid sauropod, meaning "La Amarga Lizard", it lived on the early Cretaceous period 122-129 million years ago, what is now Argentina. This dinosaur is recognizable from it's keratinous neck, although, Amargasaurus was a small sauropod, standing up to 10 meters long.
This model may be inaccurate, since scientists have debated whether the spines protruding from Amargasaurus' neck and back were a dorsal fin or simply spines.
Amargasaurus is a gradient green sauropod with a segmented, fluid tail, and a large dorsal fin running down its neck and back. It has black toes with a sail on its neck to its back the color of its body. It has a relatively small head and is very small itself for a sauropodomorph.