Opisthobranch of the Week Data
Marionia sp. 3 is considered to be very rare in the waters of Okinawa's main island as I have seen and collected only the above single individual over a period of many years of diving here. The animal was collected near shore, during a relatively high spring tide (178cm) from an area of live stony corals while turning coral rubble. As a large slab of rubble was overturned the animal was discovered on the lower surface of the slab. I've added a second page showing a close-up view of the elaborate rhinophores of this relatively large tritoniid nudibranch.
Marionia species are known to prey on xeniid soft corals (Gosliner, et al, 1996), however, Marionia sp. 3 was not found associated with any food source.
Marionia sp. 3 is one of several undescribed species of Marionia from Okinawan waters. As of mid-June, 2013, I've featured four unknown (undescribed?) species on thses pages. These four are as follows:
Marionia sp. 1 Marionia sp. 2 The above featured animal Marionia sp. 3 Marionia sp. 4