Tiburonia granrojo is a jellyfish of the family Ulmaridae discovered in 2003, and the only member of its genus yet identified. It was discovered by a crew from MBARI led by George Matsumoto. Its genus name is Tiburonia because the ROV the crew were using was called Tiburon, meaning "shark" in Spanish. Its species name was originally to be called "Big Ugly", but Kirsten Matsumoto raised objections to this name, and renamed it granrojo, meaning "big red" in Spanish.