Common Words by Reading

サイ
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lamellibranches (i.e. bivalves)
enteropneusts (hemichordates of class Enteropneusta)
pterobranchs (hemichordates of class Pterobranchia)
えら
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gills ②angle of the mandible
branchial respiration (breathing using gills)
gill slit ②pharyngeal slit