This species of nudibranch is part of a complex involving species that were once considered to represent a single species. Compare this species to Chromodoris elizabethina Bergh which is the third species pictured on this page. Most of these related five species have a combination of blue,l black, orange, white and blue rings or lines. Chromodoris annae has a blue mantle with darker markings and lacks a mid-dorsal longitudinal line when contrasted with Chromodoris elizabethina Bergh. It is found on open rock walls and reef faces where it feeds on aplysilid sponges at a depth of 45 to 95 feet.