Dendrodoris nigra is a marine[2] species of sea slug, a dorid nudibranch, shell-less marine gastropod mollusks in the family Dendrodorididae.

[1][3] Dendrodoris nigra has body lengths up to 7 cm (77 mm) long.

The edge of the mantle is frilly, the rest of the body very soft and slimy.

[1] However, this species can have marginal or submarginal red or pink border.

[4] This species lives in the Eulittoral zone under rocks and boulders on coral rubble, gravel, algal beds or shelly sand in sheltered bays.