This appears to be a small species of Pseudoceros. There is some resemblance to and it could be a color form of Pseudoceros goslineri. The specimen in the three photos immediately below was under a rock on Kwajalein Atoll's seaward reef.
A specmen was also found at Majuro Atoll by Ken Cone and Beth Van Zummeren.
Created 18 April 2016
Updated 3 June 2021