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Ranatra

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Ranatra 

a genus of hemipterons of the family Nepidae (water scorpions). The body is elongate and almost cylindrical, and the abdomen ends in a long respiratory tube. The approximately 30 species are distributed throughout the world. Three species are encountered in the USSR. R. linearis, which has a length of 30–35 mm (including the respiratory tube, up to 65 mm), resembles a twig in shape and coloration. The species is found throughout the European USSR in stagnant waters. R.linearis is a predator, feeding on small aquatic animals, mainly insects. Two other species— R. chinensis and R. unicolor —are found in the Soviet Far East.
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The zone of vegetation formation contains the water scorpion Ranatra fusca, the creeping water bug Pelocoris femoratus, the small water bug Zaitha fluminea, water boatman, the stillwater brook beetle Elmis quadrinotatus, several species of predaceous diving beetles, water scavenger beetles, mayfly larvae (Caenis and Callibaetis), the damselfly larva Ischnura verticalis, and dragonfly larvae (Aeschnidae and Libellulidae).
Aquatic macroinvertebrates of the Grand Calumet River by Whitman, Richard L. / Proceedings of the Indiana Academy of Science
 
 
 
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