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F. rubrolineata is one of a group of aeolid nudibranchs whose rhinophores are papillate on the posterior side. The base color of the body is a translucent pinkish red, orange or purple. In most individuals, there are three longitudinal stripes on the dorsum (but are absent in the specimen here). The rhinophores are lamellated and slender, translucent orange or red, while the papillae part are deeper colored. The cerata are banded in a dark purple. This species grows to 1.5 to 2cm in length.
Spotted this delightful nudi on a clump of hydroids, at a depth of about 13m (dive site: Chesca Garden, Talikud Island). It measured about 2.5cm long.