Nepa cinerea

''Nepa cinerea'' is a species of water scorpion , found in Central Europe and the British Isles.

It lives in ponds and stagnant water and feeds upon aquatic animals, especially insects.

Respiration in the adult is effected by means of the caudal process, which consists of a pair of half-tubes capable of being locked together to form a siphon by means of which air is conducted to the tracheae at the apex of the abdomen when the tip of the tube is thrust above the surface of.. more