MYN / Niall Benvie / Diving bell spider (Argyroneta aquatica) underwater, Finland, June.

MYN / Niall Benvie / Diving bell spider (Argyroneta aquatica) underwater gathering air, Finland, June.

MYN / Emanuele Biggi / Air-bell spider (Argyroneta aquatica) adult male underwater, Vercelli, Italy, February. Meetyourneighbours.net project

MYN / Emanuele Biggi / Air-bell spider (Argyroneta aquatica) adult male underwater, Vercelli, Italy, February. Meetyourneighbours.net project

Jan Hamrsky / Water spider (Argyroneta aquatica) detail of air bubble around its abdomen, Europe, July, controlled conditions

Jan Hamrsky / Water spider (Argyroneta aquatica) refilling its air supply, Europe, July, controlled conditions

Jan Hamrsky / Water spider (Argyroneta aquatica) with air bubble, Europe, July, controlled conditions