New Record of Oceanactis diomedeae (Cnidaria : Actiniaria : Oractiidae) and Systematic Position of the Genera Oceanactis and Oractis

Abstract

The small, deep-water sea anemone Oceanactis diomedeae (McMurrich, 1893) is recorded for the first time since it was first described, living in muddy habitats of the Sea of Okhotsk. The genus Oceanactis Moseley, 1877 is considered synonymous with Oractis McMurrich, 1893 and is the only genus belonging to the family Oractiidae Riemann-Zurneck, 2000. The invaginations of the oral disc or "glandular sacs", unique to the Oractiidae, are described and their possible function is discussed.