Aegires citrinus is known from the Marshalls by a single very small specimen found at Kwajalein Atoll. It came up in a bag of rubbly sediment gathered at the base of a vertical cliff at a depth of about 60m. They have been reported to eat yellow calcareous sponges as in the photo below, and there were numerous colonies of this sponge on the reef wall above the flat where the sediment was collected. We suspect our bubbles may have dislodged it and it fell to the bottom just in time to be swept into the bag with the collected sediment. The nudibranch was placed on one of these sponges for this picture. The animal measured about 15mm.
Aegires citrinus was formerly known as Notodoris citrina and is still seen under that name in many places.
Created 3 January 2007