The Spotted Jelly or Lagoon Jelly (Mastigias papua) is a species of jellyfish. It lives mainly in the southern Pacific Ocean. Instead of one single mouth, they appear to have several smaller mouth openings in their oral arms. These feed on zooplankton. [1]In Japan--especially along Pacific coast areas--these are sold as novelty pets, along with photoautotrophic phytoplankton, and are called takokurage (), or "octopod" or "rammer" jellies.
Huge swarms of these medusae, inhabitants of Jellyfish Lake, have symbiotic algae. The medusae swim back and forth across the lake to stay in the sun as long as possible. Their nematocysts have lost all their potency.