(photos of Adam Petrusek, Czech Republic: specimen from Red Sea)
This most conspicuous and often photographed warm-water species is often inhabited by anemonefishes. It is widely known as Heteractis magnifica, although its valid name is Radianthus magnifica. According to K.W. England (1988) Heteractis is a very different genus belonging to its own family Heteractidae and characterized by moniliform tentacles with characteristic swellings or protuberances which may be blister-like or more frequently forming a band across tentacle. Indeed, the type species of Heteractis (Heteractis aurora) has very characteristic tentacles which differ considerably from long and smooth tentacles of Radianthus magnifica. Further, Heteractis aurora has special nematocysts which do not occur in Radianthus magnifica and other anemones of the family Stichodactylidae, this feature is considered as very important.
