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There are three subgroups within the cnidarians that have medusae,
cubozoans,
hydrozoans, and
scyphozoans. But the members
of only one of these cnidarian subgroups possess anything like what is shown here to the right . . . the remarkable eye of a medusa. It is the box jellies, or cubozoans, that have
eyes with biconvex lenses, not so unlike those in our own heads. As their common name implies, box jellies have a square shaped bell, to which four clumps of tentacles are attached. You can see three such clumps in the Anthracomedusa Mystery Fossil above.
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