Portuguese Man-of-War (Physalia physalis)
An infrequent visitor of the South Carolina coast, the Portuguese Man-of-War is not a true jellyfish, but rather a colorful colony of floating organisms called polyps. If stung, however, follow the jellyfish sting protocol listed above. Vinegar is not an effective treatment, as it can cause the nematocysts to continue firing. Be sure to seek medical attention if you experience a severe reaction.