| 1) |
Encyclopedia of Life (EOL)
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http://eol.org/pages/2942031/overview
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| 2) |
Sea Slug Forum (Australian Museum)
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http://www.seaslugforum.net/find/placocel
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| 3) |
Sea Slugs of Hawaii
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http://seaslugsofhawaii.com/species/Plakobranchus-ocellatus-a.html
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4)
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Wikipedia
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http://en.wikipedia.org/wiki/Placobranchus_ocellatus
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