Rhodactis spp. have an oral disc covered with pseudotentacles that are usually branched. The edge of the oral disc in most species has toe-like tentacles, and there is often a naked tentacle-free margin separating the central oral disc from the edge of the disc. Some species have thick tissues, but many have rather thin tissues, much thinner than in typical
Discosoma. Most are also slippery to the touch.
Rhodactis spp., except
R. cf. mussoidesactively feed on fleshy food when it is offered, folding up the disc margins to envelop the food. The tentacled varieties of
Rhodactis spp. tolerate and prefer much stronger light and water motion than most
Discosoma spp.
Large species of Rhodactis can trap fishes, in the same manner as the related genus
Amplexidiscus.
Rhodactisspp. reproduce by fission, pedal laceration, and a type of budding that involves the formation of gemmules both internally and on the surface of the oral disc (Sprung and Delbeek, 1997).
http://www.advancedaquarist.com/2002/10/inverts
