Here’s another nudibranch I photographed while visiting the Republic of Fiji in 2015. This particular species was spotted at a location on the island of Taveuni called Steve’s Corner, although I have no idea who Steve is, or was.
From my best attempt to identify this species, I believe it to be Carlsonhoff’s phyllidia (Phyllidia carlsonhoffi), found in the western and central Pacific Ocean. And like many tropical nudibranchs, is has fairly striking color palette, consisting of a velvety black background, with yellow-capped bluish tubercles. The larger tubercles on the back alternate with smaller tubercles in between. The rhinophores, at the right end in this photo, are orangish.
This photo was taken with a Canon EF100 mm f/2.8 Macro USM lens on a Canon EOS 5D Mk III in an Ikelite underwater housing. Lighting was provided by an Ikelite DS161 strobe in eTTL exposure mode. The exposure was set to 1/180 sec at f/5.6 and ISO 200.