This is probably the commensal shrimp Stegopontonia sp. I have encountered this little shrimp hiding amongst the long spines of the big Diadema sea urchins several times during night dives. The purplish black Stegopontonia commensalis are more common. Not sure if the red Stegopontonia are different species or just a colourmorph of S. commensalis. Anyway, the red ones are more beautiful than the purplish black ones.
[ 本帖最後由 DecaPoda 於 2015-2-6 23:03 編輯 ]