Opisthobranch of the Week Data
Elysia thompsoniis considered to be very rare in Okinawan waters; I've not personally seen nor collected any specimens and it is unknown from Okinawa's main Island, but it has been photographed by Atsushi Ono in the Kerama Islands. The close proximity of the main island of Okinawa to the Kerama Islands, as well as the similar opisthofauna to that of the Kerama Islands, suggests the possibility that it is also present here on Okinawa's main island. The above featured animal is one which was photographed in the waters of Zamami Island, 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 photographed by Atsushi Ono during August of 2000, from the waters off Zamami Island, in 5m of water. It was found on a dead coral reef environment.
Atsushi's photograph is used here with his kind permission; Atsushi of course considers the species to be very rare in the Kerama Islands in as much as he has seen and photographed only the above single 10mm individual (pers. comm.).
Bill Rudman has a much lighter colored specimen from Western Australia featured on the Sea Slug Forum.
In addition to the above featured Elysia thompsoni, I've previously featured on these pages the following Elysia species: