Molgula, or sea grapes, are very common, globular, individual marine tunicates roughly the size of grapes. Molgula are a genus of the class ascidians, having many species sized from 20–50 mm and that has a life cycle with a tailed tadpole stage or without a tailed tadpole stage. Molgula are sessile invertebrates that grows on substrates and are always found existing alone. There are over one hundred species of molgulids with a vast majority of them in the Northern and Southern parts of the world with a few along the equator. All species of Molgula are suspension feeders and will have the highest population in areas with high amounts of small particles to feed on.

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