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.

References in periodicals archive ?
By contrast, the perennial streams of the eastern Shan Plateau contained a much more diverse array of taxa, including some species shared with western Thailand, as well as certain regional endemics, such as the new Ranatra described herein.
In addition to Burmese taxa, the current paper also deals with a Ranatra species from the adjacent Andaman Islands, the fauna of which is poorly known.
Color descriptions are taken from specimens immersed in ethanol, which provides improved resolution of color patterns and setiferation by mitigating the effects of attached sediment, with which Ranatra are often coated.
These sensilla have been observed in the Ranatrinae: Ranatra chinensis, Figures 10(a), 10(b), 10(d), and 10(f).
X Gelastocoridae Gelastocoris oculatus oculatus (Fabricius, 1798) X X Gelastocoris oculatus variegatus (Guerin-Meneville, 1844) X Naucoridae Pelocoris poeyi (Guerin-Meneville, 1835) X X Nepidae Ranatra fabricii Guerin-Meneville, 1857 X X X Ranatra sagrai Drake & De Carlo, 1953 X X Notonectidae Buenoa antigone (Kirkaldy, 1899) X X X Buenoa albida (Champion, 1901) X Buenoa gracilis Truxal, 1953 X X Buenoa macrophtalma (Fieber, 1851) X X Buenoa pallipes (Fabricius, 1803) X X Buenoa platycnemis (Fieber, 1851) X X X Buenoa scimitra Bare, 1925 * * * Buenoa sp.
Nepinae: Curicta granulosa, Borborophyes mayri (Figure 6), Laccotrephes japonensis (Figures 7(a)-7(e)), Nepa cinerea; Ranatrinae: Cercotmetus asiaticus (Figures 8(a), and 8(b)), Ranatra chinensis (Figures 9(a)-9(e)).
In Cercotmetus and Ranatra, the first segment is incomplete dorsally and invisible; however, there evidently is a stripe on the lateral and ventral side (Figures 8(b) and 9(d)).
Such a condyle has been observed in the Nepidae (Borborophes mayri Figure 6(b), Laccotrephes japonensis Figure 7(c), Cercotmetus asiaticus Figure 8(b), and Ranatra chinensis Figure 9(d)), Belostomatidae (Belostoma flumineum Figure 10(f), Hydrocyrius colombiae Figure 12(d), Lethocerus deyrollei Figure 14(d)) and Naucoridae (Cheirochelinae, Gestroiella limnocoroides Figure 20(d), and Tanycricos longiceps Figure 21(f)).