Image Quest Marine - Stock Library and Wildlife Photograpy

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Coiled nematocysts in the tentacles of a Portuguese Man-O-War (Physalia physalis)

Photograph by Peter Parks

Keywords: cnidarians, hydrozoans, siphonophora, siphonophores, cystonectae, physaliidae, stinging, nematocysts, cnidae, cnidoblasts, jellyfish, tentacles, marine biology, protection, megaloplankton, pleuston, holoplankton, surface drifters