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Notonecta undulata, also known by the common name grousewinged backswimmer, are from the family Notonectidae and the insect suborder Heteroptera. They are a type of hemipteran or true bug . These aquatic insects typically spend their time at the water's surface, using their abdomen and legs to cling to the underside of the surface tension .
Notonecta glauca, also known as the greater water-boatman or common backswimmer, is a species of aquatic insect in the family Notonectidae. This species is found in large parts of Europe, North Africa, and east through Asia to Siberia and China. [1] In much of its range it is the most common backswimmer species. [2]
Notonectidae is a cosmopolitan family of aquatic insects in the order Hemiptera, commonly called backswimmers because they swim "upside down" (inverted). They are all predators and typically range from 0.5 to 1.5 cm (0.2–0.6 in) in length. [ 1 ]
The nymphs of the hemimetabolous orders mayflies, dragonflies and stoneflies, and the larvae of the holometabolous orders megalopterans and caddisflies, possess tracheal gills, which are outgrowths of the body wall containing a dense network of tracheae covered by a thin cuticle through which oxygen in the water can diffuse.
Notonecta amplifica Kiritshenko, 1931 (Europe, Asia); Notonecta arabiensis Hungerford, 1926 (); Notonecta bicirca Hungerford, 1926 (South America); Notonecta bicircoidea Hungerford, 1928 (South America)
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Culture of finfish larvae has been utilised extensively in the United States in stock enhancement efforts to replenish natural populations. [5] The U.S. Fish and Wildlife Service have established a National Fish Hatchery System to support the conservation of native fish species.
As the larvae of ascidian tunicates don't feed at all, [9] the larvae of doliolids goes through their metamorphosis while still inside the egg, [10] and salps and pyrosomes have both lost the larval stage, [11] it makes the larvaceans the only tunicates that feed and have fully functional internal organs during their tailed "tadpole stage ...