Originally described from the Tuamotus, Pleurehdera haraldi has since been found in the Marshalls and in Hawaii. We have seen Marshall Islands specimens at Enewetak, Kwajalein and Bikini Atolls, where they live under rocks on lagoon reefs and pinnacles at depths of 1 to at least 15 meters. John and Lynette Flynn also record it from Rongelap. Like a number of other pleurobranchs, they vary somewhat in color between individuals. Pleurehdera haraldi was first reported in the Marshalls from Enewetak and Bikini Atolls by Willan (1984).
The next one was under a rock on a shallow lagoon reef on 19 July 2010.
Created 2 February 2007
Updated 3 May 2021