So far we have seen this species on only a few occasions in the Marshalls. This one crawled out of some Caulerpa algae that had been collected at Kwajalein and put into an aquarium. Sacroproteus smaragdinus was first reported in the Marshalls from Enewetak Atoll as Stiliger smaragdinus by Johnson & Boucher (1984).
The first we saw was on 6 July 1981 at 5m on one of the pilings under Medren Pier at Enewetak Atoll. This 22mm animal is a bit darker in color but appears to be the same species.
Created 7 February 2007
Updated 15 June 2020