8,800 feet deep in the Gulf of Mexico. Helmet jellyfish (Periphylla periphylla) — luminescent, red-colored jellyfish and Cystisoma species — a translucent hyperiid
8,800 feet deep in the Gulf of Mexico. Helmet jellyfish (Periphylla periphylla) — luminescent, red-colored jellyfish and Cystisoma species — a translucent hyperiid