Kankelibranchus incognitus is a species of sea slug, a nudibranch, a shell-less marine gastropod mollusc in the family Polyceridae.

The gills, papillae and all of the elevated structures of the body are pale yellow.

There are long branched processes on the oral veil, in addition to simple papilla.

On the flanks and below the rim of the mantle there are also branched processes and buds of unequal sizes, with the largest reaching the height of the gills; these branched processes continue on the tail and on the sides of the body.

Sole of the foot yellowish, with a tiny black dot.