Opisthobranch of the Week Data
Gymnodoris sp. 5 is considered to be very rare in the waters of Okinawa's main island as I have seen and collected only the above featured single individual. The animal was collected near shore toward the end of a mid-morning SCUBA dive from an area of mixed silty-sand and strewn rock-coral rubble.
This relatively small gymnodorid is recognized by its transparent body wall, orange-tipped rhinophores, and small orange pustules dispersed over the body. The gills form a circle midway on the dorsum. There are several blotches of irregular ivory-colored pigment on both sides of the body including the dorsum. There is also a more dense circular patch of white pigment below and slightly posterior to the rhinophores on both sides of the animal. In as much as this is the only specimen collected it's of course difficult to make meaningful generalizations as to its color without additional comparative material. The animal does appear similar to one depicted from the Keramas by Atsushi Ono (1999, Gymnodoris sp. 2, p. 73).
In addition to Gymnodoris sp. 5, I've previously featured on these pages the following described and undescribed species of Gymnodoris from Okinawan waters:
* Kerama Islands = the Kerama Islands Group, located 30 ~ 40 kilometers west of the Okinawa capitol, Naha.