Chromodoris lochi and Passenger
This image was made at North Log, one of the brilliant dive sites near Uepi in the Solomon Islands.
The nudibranch is Chromodoris lochi, a reasonably common nudibranch in tropical Indo Pacific waters.
I liked the side on profile of this individual, and the blurred background really sharpens the nudibranch.
On processing this image, I was delighted to find an even smaller subject riding the back of the nudi.