specimen of barrel jellyfish

animal aquatic arms barrel blue blueviolet cap castro cauliflowershaped currents daylight domed dustbinlid edges eight fauna feeding fish frillymouthed fringed green hat hemispherical italy jellyfish large latium long marine mediterranean medusa montalto nature ocean opalescent plankton rhizostomatidae scyphomedusa sea season shape size small species summer sunlight swarms swimmers tentacles tirrenean transparent underwater venomous viterbo water wild wildlife zoology