Body flat, oval, with the posterior end of the foot covered by the notum. Mantle firm and rough to the touch. Dorsum covered by numerous, small conical tubercles, which are larger near the central area. Ventrally, the anterior border of the foot is grooved and notched. Head with a pair of small oral tentacles. Gill composed up to nine tripinnate brachial leaves, that can be retracted into a pocket beneath the mantle. Rhinophores lamellate.
animal pale greyish brown in overall appearance, with several rounded or oval dark brown spots of different sizes, being larger in the central region of the dorsum. Sometimes, two white patches in the dorsal midline, but obscured in heavily pigmented specimens. Along the innermost sides of the mantle margin, two lines of large, oval, black spots. The ventral side of the foot and mantle margin are covered with numerous brownish spots of various sizes.
common size :
adult usually reach up to 60-70 mm in length.
D. lilacina belongs to a worldwide species-complex of doridaceans with a pattern of brown-spoted greyish coloration and tuberculated notum. All these species are quite similar in external appearance and they are indistinguishable if the internal anatomy is not studied.
BIOLOGY / ECOLOGY
Probably feeds on siliceous sponges. The spawn forms a wide and flat coiled egg ribbon, of 2-4 coils, up to 80 mm in diameter. This species is characterised by its ability to autonomise large sections of the mantle when disturbed.
intertidal or shallow water in the Indo-Pacific, usually under dead coral slabs. The specimen recorded in Israel was dredged 40 m deep; the specimen from Lebanon found in rocky bottom at 2-3 m depth.