[2] This species was synonymised with Pleurolidia juliae by Rudman.

[3] A careful study by Carmona et al. using DNA sequencing showed that these were really two sister species and that they were not members of the family Aeolidiidae.

[4] This species was described from Kasajima, Sagami Bay, Japan.

[4] Protaeolidiella atra is an aeolid nudibranch with a burgundy to black coloured body and numerous cerata with white tips.

[4] It is confused with Pleurolidia juliae in many works but can be distinguished by the lack of a dorsal white line on the body and more numerous, ungrouped cerata.