Thorunna halourga is rare, but has been found here in the Marshalls at Enewetak and Kwajalein Atolls. Specimens were found on lagoon reefs and pinnacles under chunks of dead coral at depths of 4 to 18 meters. Thirteen specimens we measured ranged from 5 to 16mm in length.
At 16mm long, the following one is the largest of our specimens. In this one, and in a few others, the normally white margin is tinged with yellow.
These two different species were found under the same rock, but feeding on different sponges. The T. halourga was eating a thin, encrusting yellow-orange sponge, while the pink species of Noumea at right was eating the pink sponge beneath it. Another photo of these two can be seen on the Verconia cf verconiforma page.
Created 3 January 2006
Updated 15 January 2007
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