Portuguese man o' war (Physalia physalis)

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Portuguese man o' war floating at surface of sea

© Wild Wonders of Europe / Lundgren / naturepl.com
Portuguese man o' war on sea surface

© Luis Quinta / naturepl.com
Portuguese man o' war

© Justin Gilligan / SeaPics.com
Portuguese man o' war at surface of sea, showing tentacles below

© Wild Wonders of Europe / Lundgren / naturepl.com
Coiled nematocysts in the tentacles of a Portuguese man o' war

© imagequestmarine.com
Nematocyst discharge from the tentacles of a Portuguese man o' war

© imagequestmarine.com
Close-up image of Portuguese man o' war nematocyst discharge

© imagequestmarine.com
Portuguese man o' war with fish prey

© imagequestmarine.com
Detail of Portuguese man o' war reproductive cells

© Reg Morrison / Auscape International
Blue sea slugs attacking Portuguese man o' war

© imagequestmarine.com
Parasitic fluke within the tentacle of a Portuguese man o' war

© imagequestmarine.com
Mass of Portuguese man o' war colonies washed up on shore

© Luis Quinta / naturepl.com