This is a closeup of the tentacles of Portuguese Man O'War (Physalia physalis), or Bluebottle, is a jellyfish-like marine cnidarian of the family Physaliidae!!!! 

its venomous tentacles can deliver a powerful sting by the way, is really beautyfull! also P. physalis isn´t a whole animal, is a colony!!:O

Photo by Simon de Glanville