Nudibranch Similarities

Doriopsilla carneola group

Author: Richard Willan

The Doriopsilla sp. from Western Australia and Doriopsilla aureopunctata are identical externally, but there are internal differences especially in the reproductive system. And then there is the vast geographical distance separating them as well.

 

Doris montereyensis group

Peltodoris nobilis from British Columbia, CanadaIdentification reviewed by Gary McDonald
(27 photos)
 

Favorinus tsuruganus group

(No photo)
 

Flabellina exoptata group

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.

Flabellina exoptata from Raja Ampat, Indonesia
(309 photos)
 

Glossodoris cincta group

Author: Erwin Kodiat

These three species can be distinguished by visually observing the mantle margin.
In Glossodoris cincta, the mantle margin bordered by well-defined turquoise blue, black and gold concentric bands.
While in Glossodoris hikuerensis, they are bordered by concentric bands of brown, brownish white, dark greyish black and then brownish white.
In Glossodoris pullata, it is simply bordered by dark blue mantle margin.

(Summarized from Undersea Jewels book)

Glossodoris cincta from Lembeh, IndonesiaIdentification reviewed by Richard Willan
(333 photos)