Hypselodoris katherinae has previously been confused with
Hypselodoris carnea. The mantle is translucent pale pink with a series of longitudinal red-brown lines running down its length. These lines may be broken into short segments and may branch and anastomose. Small blue-purple diffuse spots are arranged at the mantle margin and may coalesce into a continuous line. The gills are white with orange lines on the rachis and the
rhinophores are red to orange in colour. ==References==