blue velvet headshield slug, chelidonura varians, is a species of small sea slug, a marine opisthobranch gastropod mollusc in the

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