A colorful nudibranch, Phyllidia varicosa, crawls on a black sand seafloor in Alor, Indonesia.

alor animal animal markings animal themes animals in the wild aquatic beautiful bumpy cerata close up color image colorful coral triangle crawling dorid nudibranch horizontal ichthyology indo pacific ocean indonesia invertebrate lesser sunda islands living organism marine biology melanesia mollusk no people nudibranch one animal outdoors photography phyllidia varicosa poisonous rhinophore sea life sea slugs sea snails side view slug snail southeast asia species toxic toxic substance tropical climate tubercle underwater warty sea slugs wildlife yellow zoology