Opisthobranch of the Week Data
Thorunna sp. 1 is considered to be very rare in Okinawan waters; only three individuals have been seen by Atsushi Ono (per. comm.) and RFB has seen none directly off Okinawa's main island. It should however be noted that Yukinobu Adachi has photographed this unknown species from Maeda Point, a popular dive site on Okinawa's main island. Yukinobu has this animal (17mm length, photographed at 5m) featured on his homepage.
The above featured animal was photographed and collected by Atsushi Ono from Amuro Island in the Kerama Islands, one of a series of islands in the Kerama Islands Group, which are located 30 ~ 40 kilometers west of the Okinawa Capitol, Naha. This featured animal was found by Atsushi during March of 1998 in 3m of water. It was found on a rock of a coral reef environment. Atsushi reports (per. comm.) three individuals were simultaneous seen, within a meter of each other, but only the single above animal was collected.
In addition to the above undescribed Thorunna species found in the Keramas, there are five described species of Thorunna known from Okinawan waters. The five species are: