This is a 22mm individual found at Enewetak Atoll, under dead coral at a depth of 6 meters on a southeastern lagoon pinnacle. We have also seen at least three specimens on lagoon reefs at Kwajalein Atoll.
The specimen in the two photos below were found on a Kwajalein Atoll lagoon pinnacle on 26 June 2010. It looks intermediate with specimens we are tentatively calling "Montereina" ylva, so it is possible that all ours are M. coerulescens.
Created 15 December 2006
Updated 2 July 2010