Dear Cunming

It is difficulty to say yes but forcibly it happens. Try the link.

karbassi

Thanks very much, Mr Karbassi!

Dear Cunming:

Acuatic insects in the families Notonectidae and Pleidae known as backswimmers use air bubbles to capture oxygen. Although it is fully aquatic, a backsimmer does not have gills and is unable to use the oxygen disolved in the water. It must therefore get its air supply from the outside. There is a channel formed by hairs on each side of the abdomen. These the insect opens at the surface, allowing air to flow in and then closes them again, trapping the air. These air bubbles are therefore in direct contact with the backswimmer´s spiracles or breathing holes wich are arranged along the sides of the abdomen. The spiracles are protected by a further fringe of hairs which allows air in and keeps water out.

Best wishes

Luis Miguel