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Argyroneta aquatica with its physical gill. (A) Air clinging to the hydrophobic hairs on the abdomen of a spider away from the diving bell. (B) A small diving bell, supported by invisible web, large enough to admit the abdomen only. (C) A large bubble, captured at the surface and held on the abdomen and rear legs, is carried down to the diving bell. (D) A female in her diving bell, below the cocoon, showing the lateral extension of volume and surface area. –

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