It seems that this jellyfish can really pack a punch – the thick bright ends of its tentacles are where the nematocysts (stinging cells) are especially dense.
Potent Jellyfish
Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin. Download larger version (jpg, 466 KB).

It seems that this jellyfish can really pack a punch – the thick bright ends of its tentacles are where the nematocysts are especially dense.

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