Flabellina riwo, Flabellina bilas and Flabellina bicolor). There would have been another stripe along each side of the foot, but they are not visible in this photo because of the angle it was taken from.Flabellina rubrolineata and they never occur in Flabellina bilas.
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Pictures of Flabellina rubrolineata
Author: Richard Willan
Flabellina exoptata. Its consistent characters are the vivid orange rhinophores with numerous papillae on the posterior side and the central purple (or bluish violet) ring on the cerata.
Flabellina rubrolineata also has papillae on its rhinophores, but it has 3 longitudinal stripes on its body.
Flabellina delicata also has papillae on its rhinophores, but it has a purplish body and oral tentacles, and the tips of the cerata are dark purple.
Flabellina macassarana has lamellate rhinophores (i.e., numerous plate-like folds). It has a translucent pinkish to purplish white body, and the tips of the cerata are burnt orange.