blue velvet headshield slug, chelidonura varians

blue velvet headshield slug chelidonura varians romblon underwater macro animal indonesia sulawesi sea slugs biology photography biodiversity location invertebrate mollusc lens nature marine bunaken underwaterphotography scuba diving wildlife tropical water ocean nudibranch wild beautiful coral reef ecology natural background environment closeup snail life pattern pacific philippines species small opisthobranch gastropod order cephalaspidea