Ranatra linearis is a species of aquatic bug in the Nepidae family.

[1] It is native to Eurasia and North Africa, and primarily found near aquatic plants in ponds, marshes and other freshwater habitats, but has exceptionally been recorded from hypersaline lakes and brackish lagoons.

[2] The body of these brown insects is typically 3–3.5 cm (1.2–1.4 in) long.

[3] Their breathing tube tail is usually about as long as the body of the insect.

They are swimming insects, and the adults can fly.