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Opisthobranchiata

Source : Webster's Revised Unabridged Dictionary (1913)

Opisthobranchia \O*pis`tho*bran"chi*a\, Opisthobranchiata
\O*pis`tho*bran`chi*a"ta\, n. pl. [NL., from Gr. ? behind + ?
   gills.] (Zo["o]l.)
   A division of gastropod Mollusca, in which the breathing
   organs are usually situated behind the heart. It includes the
   tectibranchs and nudibranchs.
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