Samla riwo is a species of sea slug, an aeolid nudibranch, a marine heterobranch mollusc in the family Samlidae.

[3] Samla riwo typically reaches a length of 20 mm when fully mature.

The oral tentacles are expanded at the tips into spear-like points or paddles.

The bottom 2/3 of each of the cerata is translucent with pale peach-coloured digestive gland.

The rhinophores have a bare, cylindrical basal region followed by a perfoliate club with 16-22 densely packed lamellae.