Halitrephes

Genus of hydrozoans

Halitrephes maasi, commonly known on the internet as the firework jellyfish, is a species of deep sea hydrozoan of the family Halicreatidae. The most recent account of the jelly has been found at a depth of 4,000–5,000 feet (1,200–1,500 m) near the Revillagigedo Archipelago off Baja California Peninsula, Mexico.

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