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Pleurobranchus forskalii
A nudibranch. Cordova, Cebu. Found during lowtide.
Hello, girlwithacamera! I hope you'll include this (and your other mollusk spots) in the Mollusca mission. Here's the link: http://www.projectnoah.org/missions/1214...
Technically speaking btw, this isn't a nudibranch. However, sea slug enthusiasts lump it in with nudibranchs, along with others like sapsucking slugs (eg., Thuridilla spp.) and sacoglossans (eg., Elysia ornata). A better term for referring to all these sea slugs, perhaps, is Opisthobranchs. :)