A beautiful nudibranch (Halgerda batangas) crawls across the black sand seafloor in Lembeh Strait, Indonesia.

animal animal themes animals in the wild aquatic beauty in nature biogeography bizarre black sand color image day discodorididae dorid nudibranch doridoidea ecology full length gastropod halgerda batangas horizontal indonesia lembeh lembeh strait marine biology mollusk no people nudibranch ocean floor one animal outdoors pacific ocean photography sea life sea slugs seabed seafloor side view soft bodied southeast asia spotted sulawesi undersea underwater wildlife