Coryphellina rubrolineata is a species of sea slug, an aeolid nudibranch, a marine heterobranch mollusc in the family Flabellinidae.

[3] The stretched out body has a sharp end at the tail, the dorsal side is covered with a certain amount of extensions called cerata, which size vary from an animal to another.

Coryphellina rubrolineata is thought to be widespread in tropical, subtropical and temperate waters in the Indo-Pacific area and also as a migrant species in the Mediterranean Sea.

[6] It is also commonly observed on shallow reef or rocky slopes rich in hydroids which represent its main diet.

This stinging cells stock is a particularly effective means of defense and is located at the ends of cerata, it is contained in cnidosacs.