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Cannonball or Cabbage?

This specimen of Stomolophus meleagris aka “cannonball jellies” or “cabbage head jellies” was captured for study from the waters around the Liquid Jungle Laboratory in Panama. Biology graduate student Kelly Rakow, and her mentor Larry Madin, collect jelly animals in an effort to document which gelatinous creatures live in particular environments. Cannonball jellies are peculiar in that they (like corals) have zooxanthellae, or photosynthetic symbionts, embedded in their tissues. (Digital video capture by Kelly Rakow, Woods Hole Oceanographic Institution)