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Less than 1 inch specimen, bright blue with orange rhinophores
spotted @ 10m in Ka Osting, Malapascua Cebu
Hi Ike. Technically, this isn't a nudibranch, but it certainly is a sea slug. Marta's right, this is Thuridilla lineolata.
Spotted on Nov 9, 2012 Submitted on Nov 15, 2012