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Nepidae is a family of exclusively aquatic Heteropteran insects in the order Hemiptera. [1] They are commonly called water scorpions for their superficial resemblance to scorpions, due to their raptorial forelegs and the presence of a long slender process at the posterior end of the abdomen, resembling a tail. [2]
A water scorpion breaths air from an air bubble trapped beneath its winds, which includes very small water repellent hairs. [2] [3] Oxygen from the air bubble is taken in through abdominal spiracles located on the abdomen. [2] When the air bubble is almost depleted the water scorpion uses its respiratory siphon to break the water surface. [2]
Ranatra is a genus of slender predatory insects of the family Nepidae, known as water scorpions or water stick-insects. [1] There are more than 140 Ranatra species found in freshwater habitats around the world, both in warm and temperate regions, with the highest diversity in South America (almost 50 species) and Asia (about 30 species, reviewed in 1972 [2]).
The respiratory siphon consists of two filaments which are extensions of the eighth abdominal tergum. These in unison form an air duct which takes in air from above the water surface (similar to a snorkel). Air is fed via the tracheal system and spiracles on the dorsum of the first abdominal segment to an air store under the elytra. [5]
A siphon is a tubular organ of the respiratory system of some insects that spend a significant amount of their time underwater, that serves as a breathing tube. The larvae of several kinds of insects, including mosquitoes, tabanid flies, and Belostomatidae, live in the water and breathe through a siphon. Water scorpion Ranatra elongata
Nepa is a genus belonging to the family Nepidae, known as water scorpions.Species are found in freshwater habitats in the Northern Hemisphere. [2] [3] [4]They are oval-bodied, aquatic insects with raptorial front legs.
Ranatra fusca is a water stick-insect in the family Nepidae, native to North America. It is known by the common name brown water scorpion. [1] [2] It is generally 3.2–4.2 cm (1.3–1.7 in) long. [3] They are carnivorous and feed on other insects and crustaceans. They are most common from spring to autumn.
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 the water. In immature forms, the siphon is ...
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