This may be Trapania sp. 5 in Gosliner et al (2015). Specimens have been found by Peter and Marissa Brown and Jay Lord both on red sponge on pier pilings and on the large sponge Ianthella basta in Kwajalein lagoon. The nudibranchs measured about 6mm stretched out.
Thie photo below was from red sponge covered with the entoprocts that make up the diet of this Trapania.
The specimen below on a field of entoprocts on orange sponge was found and photographed on the lagoon side of Kwajalein Island by Christina Sylvester.
Created 3 February 2016
Updated 21 August 2016
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