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from National Geographic

Colorful Sea Creature Photos

The bright, contrasting hues of mating Nudibranchs—sea slugs found in reefs and the deep ocean—warn potential predators of their venomous, unpalatable flesh. Equipped with both male and female reproductive organs, each nudibranch fertilizes the other, and both produce eggs.

Nudibranchs are shell-less marine molluscs that live in seas around the world. They have external gills (frond-like) that give the nudibranch its name, meaning naked gills. Photographed off Indonesia.

Thuridilla lineolata is a species of sea slug, a sacoglossan, a marine gastropod mollusk in the family Plakobranchidae. It is an Indo-Pacific species that lives in or near coral reefs and eats algae.