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Aspidobranchia
Aspidobranchia As`pi*do*bran"chi*a, n. pl. [NL., fr. Gr. ?, ?,
shield + ? gills.] (Zo["o]l.)
A group of Gastropoda, with limpetlike shells, including the
abalone shells and keyhole limpets.
Meaning of Aspidobranchia from wikipedia