ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Moon jellyfish sex glands. Close up of the sex glands of an ephyra medusa of the cnidarian Aurelia aurita. Medusae are the sexually mature, free-swimming larval stage of cnidarians and are commonly known as jellyfish. The ephyra originates from a fertilised egg in the adult. The egg develops into a planula larva, from which ephyra medusa like this bud off.
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