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A translucent arctic comb jelly.

It's a Jelly!

The Arctic comb jelly or sea nut (Mertensia ovum) is commonly found in the surface (top 50 meters) in cold, northern waters. Like other cydippid ctenophores, it has two tentacles fringed with smaller tentacles, which are dappled with colloblasts.

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At Smithsonian Ocean, we have lesson plans, activities, and resources to help you engage your students in the wonders of our oceans.