If you saw this out in the wild, you might be confusedabout what it is, it looks like a shell or a button, but it's just the bluebutton jellyfish.
The blue button jellyfish can be found inPacific, Atlantic, and Indian oceans, as well as the Mediterranean Sea andeastern Arabian Sea. They are found in warmer, subtropical areas. Like mostother jellyfish, they eat phytoplankton and dead organisms . Somethinginteresting about the way they eat is that their “mouth” is also the way theydiscard food waste.
These blue buttons have a sting, it’s not lethalto humans but it can be painful and cause a rash. The jellyfish don't have manypredators except some larger fish and turtles. There are many of them so theyaren’t endangered. But a lesser known thing about them is that the blue buttonjellyfish is made up of a colony of smaller organisms called hydroids.Different parts of the colony do different things.
Blue buttons are generally small animals, Whenthey are fully grown they are about one inch in diameter plus tentacles. Butsome of them are small enough to fit in your fingertip. They have bright bluetentacles, and a hard,  golden brown gas filled center.
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