Sea Slugs (Opisthobranchia) - My Hawaiian Images
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...and the collision! Someone call 911! Neither animal was particularly happy at this point...obviously the Red spotted nudibranch did not like getting spiked, and the Pebble collector urchin had no interest in letting a toxic Chromodoris anywhere near its underside...they violently (relatively speaking) swerved apart a few seconds later.

Opisthobranchianudibranchsea slugchromodorisred spotted nudibranch