This little guy the size of my thumbnail was happy to cruise around hunting for food on the reef quite unnoticed as I sat patiently waiting for the perfect angle on some other less interesting creature.

While peering through the viewfinder this lump of moon rock literally slid into the frame.

I still do not know what kind of nudibranch this little guy is but I affectionately named it based on the crater pocked surface of its skin.

Photo: Robert Rath, ‘Moonbug’ 1/100 f/14 ISO320 100mm