(photos of John Dench and Jacques Alberts: specimen from South Africa)
Korsaranthus natalensis is a sole member of the genus Korsaranthus. This is a very interesting mobile sea anemone attacking and feeding octocorals. It has a distinctive and apparently constant color - red or orange with white stripes and could be easily distinguished in the field. So far it is known only from South Africa.
See: Riemann-Zurneck, Gallardo, 1991, Korsaranthus nathalensis (Carlgren, 1938) nov. comb. (Cnidaria: Actiniaria) a mobile sea anemone attacking octocorals. S. Afr. J. Zool., 34(4):190-196.
Taxonomy:
Phylum Cnidaria
Class Anthozoa
Order Actiniaria