Opisthobranch of the Week Data
Goniodoris joubini is considered to be very rare on Okinawa as I have seen and collected a total of only five individuals; the first specimen was collected during March of 1991, and the most recent collected in April of 1993, at which time two individuals were collected.
I currently have in addition to Goniodoris joubini, only a single additional described species of Goniodoris found here on Okinawa's main island, G. felis. Goniodoris felis, is however not apt to be confused with G. joubini as G. joubini has a prominent lateral sinuous ridge on both sides of the mantle unlike the mantle of G. felis. Although relatively small, G. joubini is unlikely to be confused with any other opisthobranch found in Okinawan waters.