This animal was not found in the Marshalls. It was found and photographed by Stan Jazwinski in very shallow water at nearby Kosrae Island in the Caroline Islands (Federated States of Micronesia). The reason we have included it is that it nearly exactly matches in color and size Bergh's (1905) original figure of the animal, suggesting that what has generally been called Platydoris sanguinea, both in the Marshalls and elsewhere, is in fact something different. We now figure that one as Platydoris cf sanguinea. This animal was about 100mm long, just a little longer than the 90mm of Bergh's description.
Here is the figure of the animal from Bergh.
Created 3 February 2016