The sixth genus of corallimorpharian family Actinodiscidae, *Amplexidicus* n.gen., is described. It is distinguished by its numerous short, simple, conical tentacles, and few marginal tentacles. The type species, and currently the only one known for the genus, *A. fenestrafer*, may attain the largest size of any known corallimorpharian (up to 450 mm oral disc diameter). It has been found in relatively shallow waters on the lagoon side of coral reefs on the Great Barrier Reef, in eastern Indonesia, Palau and Guam.
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