Sea Slugs (Opisthobranchia) - My Hawaiian Images
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This is a creature I've only seen twice and only photographed once...a Tiled pleurobranch (Pleurobranchus grandis). Pleurobranchidae (also called side-gill slugs) are related to nudibranchs, but are quite a bit larger--this one was about the size of a dinner plate...

pleurobranchtiled pleurobranchpleurobranchidaeOpisthobranchia