Black-Margin Nudibranch Crawling on Reef in Bali

A black-margin nudibranch (Doriprismatica atromarginata) crawls across dark substrate on a reef in Bali. Its creamy-yellow to pale green mantle features a characteristic, highly folded black line along the outer margin. Two dark, textured rhinophores extend prominently near its anterior end in sharp macro focus. Direct macro lighting accentuates the ruffled mantle edge and smooth body contours against a soft dark background. Ideal for marine biology journals, educational publications, and professional nature stock media.