A bi-color flabellina nudibranch, Flabellina bicolor, crawls across a black sand seafloor in Alor, Indonesia.

alor animal animal themes aquatic beautiful black sand cerata color image colorful coral triangle crawling flabellina flabellina bicolor full length gastropod heterobranchia horizontal indo pacific ocean indonesia invertebrate lesser sunda islands living organism marine biology melanesia mollusk no people nudibranch ocean floor one animal outdoors photography rhinophore samla bicolor samlidae sand sea life sea slugs seabed southeast asia tubercle undersea underwater wildlife zoology