2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
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.
From WordNet r 1.6 [wn]:
Opisthobranchia
n : gastropods having the gills when present posterior to the
heart and having no operculum: includes sea slugs; sea
butterflies; sea hares [syn: {Opisthobranchia}, {subclass
Opisthobranchia}]
more about opisthobranchia
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Lake Atitlan, Guatemala
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