This
species can reach a length of up to . Its body color varies widely, ranging from light orange-brown to black, or from whitish to cream. The body is always marked with spots, which may appear dark or clear depending on the dominant background color. The mantle, which covers the body, is composed of four distinct parts: dorsal, anterior, and two lateral pieces protecting the gills. These lateral pieces are on the right side of the body; they have the same coloration as the body, but are outlined in black. Three of its dorsal parts can be shed in case of danger, a form of
autotomy. This
species has another means of defense by secreting a repellent acid fluid. The head has a pair of smooth and slightly folded
rhinophores. A trapezoid veil masks partially the oral cavity. The egg ribbon is whitish. Image:Berthella martensi.jpg Image:32-EastTimor-Dive1 Bus-Stop 04 (Nudibranch-Berthella-Martensi)-APiazza.JPG Image:Berthella martensi, Indonesia.jpg Image:Berthella martensi 3.jpg == Distribution and habitat ==