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 ?
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.
DISCUSSION: Ranatra schuhi is a member of the Ranatra graeilis group as defined by Lansbury (1972), on the basis of the following character states: 1) the length of the respiratory siphon is short in relation to the body length, with the body approximately 2.
Ranatra schuhi is also notable among Nepidae in general for its striking color pattern on the hemelytra, consisting of a red ground color overlain with yellow maculations and flecking, and with the veins creamy white with black dashes.
schuhi were collected from the second, shallow stream, in company with other aquatic Heteroptera species including Ranatra lansburyi Chen, Nieser and Ho (Nepidae), Metrocoris nigrofascioides Chen and Nieser (Gerridae), Hydrometra longicapitis Torre-Bueno (Hydrometridae), and Enithares intha Paiva (Notonectidae).
DISCUSSION: Within the Ranatra gracilis group, R lansburyi may be easily separated from R.
DISCUSSION: Ranatra distanti was originally described from a single holotype female taken in the Nicobar Islands (Montandon, 1910).
This species is easily separated from all other members of the Ranatra gracilis species group by the distinctive structure of the dorsal prothorax, with a pair (1 + 1) of small tubercles along the transverse sulcus between the anterior and posterior pronotal lobes, and another pair (1 + 1) of larger tubercles on the posterior projections of the posterior lobe; these latter tubercles also bear small, transverse pits across their tops.
Ranatra heydeni Montandon habita Brasil, Paraguay y Argentina (provincias chaquenas) (Nieser & Melo, 1997; Bachmann, 1998); aqui se la menciona por primera vez de Jujuy y del parque.
Clave de las especies americanas descriptas del genero Ranatra Fabricius (Hemiptera, Ranatridae, Ranatrinae).
versuta Drake & Harris + + Veliinae Platyvelia brachialis (Stal) + GERRIDAE Gerrinae Gerrini Limnogonus aduncus aduncus Drake & + Harris Tachygerrini Eurygerris fuscinervis (Berg) + + Trepobatinae Trepobatini Trepobates taylori (Kirkaldy) NEPOMORPHA NEPIDAE Nepinae Curictini Curicta grandis De Carlo + Ranatrinae Ranatra heydeni Montandon + BELOSTOMATIDAE Belostomatinae Belostoma bifoveolatum Spinola B.