Gill. The gills are found on and near the bases of the thoracopods in the branchial chamber. They are whitish, plumiform organs that are placed on the epipods (the podobranchia), at the articulation of the leg with the body (arthrobranchia), or on the body itself (pleurobranchia). Water is pumped through the branchial chamber and gas exchange takes place through the thin wall of the gill filaments.

Alternative form for branchium : branchia.