Tiburonia granrojo, also known as the giant jellyfish, is a jellyfish of the family Ulmaridae discovered in 2003, and the only member of its genus yet identified. It is one of the largest sea jellies and unusual in a number of ways. They can grow up to three meters in diameter and have thick fleshy oral arms in place of the long tentacles found in most jellies. The entire jellyfish is deep red in color.
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