The root-mouthed jellyfish (Eupilema inexpectata) is a species of cnidarian, a jellyfish in the small family Rhizostomatidae. It is the only member of the genus Eupilema.

Description This large jellyfish grows up to more than in diameter. It has a smooth-surfaced bell with no tentacles. Its large manubrium (mouth) has many microscopic holes which extend directly into the gut.Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. 2010. Two Oceans: a guide to the marine life of southern Africa. .

Distribution This jellyfish is found around the whole South African coast from the surface to at least underwater.

Ecology This is a large jellyfish which feeds on microscopic prey. It is often seen with small fish, which use its bulk to hide from predators.

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