Thuridilla gracilis is similar to T. bayeri, but it lacks the blue and often yellow colors of that species. It was common at Enewetak Atoll and has been found occasionally at Kwajalein. Specimens were also observed at Utirik Atoll in 1983. Specimens are usually seen on or under dead coral or rubble on lagoon reefs and pinnacles. Ten measured specimens ranged in length from 13 to 25mm.
The extremely dark 11mm long specimen below was found at a depth of 1m on a lagoon reef of Utirik Atoll. Despite the difference in coloration, we assume this is a form of Thuridilla gracilis.
Created 22 January 2007
Updated 10 December 2007
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