Table 2.

Species composition of macrozoobenthos in the investigated small rivers.

Taxonomic Groups		Genus, Species
Volga River basin
Phylum Mollusca	Class Gastropoda	Anisus sp., Bithynia tentaculata (Linnaeus, 1758), Cincinna piscinalis (Müller, 1774), Cincinna sp., Lymnaea auricularia (Linnaeus, 1758), L. intermedia (Lamark, 1822), L. ovata (Draparnaud, 1805), Lymnaea sp., L. stagnalis (Linnaeus, 1758), Planorbis planorbis (Linnaeus, 1758), and Viviparus viviparus (Linnaeus, 1758)
	Class Bivalvia	Dreissena polymorpha (Pallas, 1771), Euglesa sp., Musculium sp., and Neopisidium sp.
Phylum Annelida Class Clitellata	Subclass Oligochaeta	Dero digitata (Müller, 1773), D. obtusa Udekem, 1855, Enchytraeus albidus Henle, 1837, Limnodrilus claparedeanus Ratzel, 1868, L. hoffmeisteri Claparede, 1862, L. udekemianus Claparede, 1862, Lumbriculus variegatus (Müller, 1773), Nais barbata Müller, 1773, N. communis Piguet, 1906, N. pardalis Piquet, 1906, N. pseudobtusa Piguet, 1906, N. variabilis Piguet, 1906, Ophidonais serpentina (Müller, 1773), Stylaria lacustris (Linnaeus, 1767), Tubifex tubifex (Müller, 1773), and Uncinais uncinata (Oersted, 1842)
	Order Hirudinea	Helobdella stagnalis (Linnaeus, 1758), Hemiclepsis marginata (Müller, 1774) Herpobdella octoculata (Linnaeus, 1758), and Piscicola geometra (Linnaeus, 1761)
Phylum Arthropoda	Subphylum Crustacea	Asellus aquaticus (Linne, 1758), Gammarus lacustris Sars, 1863, Chaetogammarus warpachowskyi (Sars, 1894), Katamysis warpachowskyi G.O. Sars,1893, Limnomysis benedeni Czerniavsky, 1882, Paramysis intermedia (Czerniavsky, 1882), P. lacustris (Czerniavsky, 1882), and Pterocuma rostrata (G.O. Sars, 1894)
Phylum Arthropoda Class Insecta	Order Odonata	Anax imperator Leach, 1815, Enallagma cyathigerum Charpentier, 1840, Erythromma najas (Hansemann, 1823), Ischnura elegans Vanderlinden, 1823, Lestes sponsa (Hansemann, 1823), Orthetrum cancellatum (Linnaeus, 1758), Sympecma fusca (Vanderlinden., 1823), and Sympetrum depressiusculum (Sélys, 1841)
	Order Ephemeroptera	Caenis robusta (Eaton, 1884), Cloeon gr. dipterum, C. simile Eaton, 1870
	Order Heteroptera	Cymatia coleoptrata (Fabricius, 1777), Gerris lacustris (Linnaeus, 1758), Hesperocorixa sp., Ilyocoris cimicoides (Linnaeus, 1758), Mesovelia furcata Mulsant et Rey, 1852, Micronecta sp., Microvelia sp., Notonecta glauca glauca Linnaeus, 1758, Plea minutissima Leach, 1817, Ranatra linearis Linnaeus, 1758, and Sigara sp.
	Order Coleoptera	Bagous argillaceus Gyllenhal, 1836, Berosus sp., Cybister sp., Donacia crassipes Fabricius, 1775, Haliplus ruficollis (De Geer, 1774), Haliplus sp., Helophorus paraminutus Angus, 1986, Hyphydrus ovatus (Linnaeus, 1761), Laccobius sp., Laccophilus sp., Noterus clavicornis (De Geer, 1774), Ochthebius sp., Paracymus aeneus (Germar, 1824), Peltodytes caesus (Duftschmid, 1805), Enochrus quadripunctatus (Herbs, 1797), and Hygrotus sp.
	Order Megaloptera	Sialis sordida Klingstedt, 1932
	Order Trichoptera	Agraylea multipunctata Curtis, 1834, Cyrnus flavidus MacLachlan, 1864, Ecnomus tenellus (Rambur, 1842), Hydroptila sp., Leptocerus tineiformis Curtis, 1834, Oecetis furva (Rambur, 1842), and Phryganea bipunctata (Retzius, 1783)
	Order Lepidoptera	Parapoynx stratiotata Linnaeus, 1758
	Order Diptera	Ablabesmyia monilis (Linnaeus, 1758), A. phatta (Eggert, 1863), Ablabesmyia sp., Anopheles sp., Bezzia sp., Chaoborus sp., Cricotopus gr. sylvestris, Chironomus melanescens Keyl, 1961, Ch. parathummi Keyl, 1961, Ch. plumosus (Linnaeus, 1758), Chironomus sp., Ch. salinarius Kieffer 1915, Cladopelma gr. lateralis, Cladotanytarsus mancus (Walker, 1856), Corynoneura coronata Edwards, 1924, C. scutellata Winnertz, 1846, Cricotopus caducus Hirvenoja, 1973, C. salinophilus Zinchenko, Makarchenko et Makarchenko, 2009, C. gr. sylvestris, Cricotopus sp., Cryptochironomus gr. defectus, Culicoides sp., Dasyhelea sp., Dicrotendipes nervosus (Staeger, 1939), D. notatus (Meigen, 1818), Endochironomus albipennis (Meigen, 1830), E. impar (Walker, 1856), Ephydra sp., Fleuria lacustris Kieffer, 1924, Glyptotendipes barbipes (Staeger, 1839), G. glaucus (Meigen, 1818), G. gripekoveni (Kieffer, 1913), G. paripes Edwards, 1929, G. salinus Michailova, 1987, Guttipelopia guttipennis (Wulp, 1974), Lauterborniella agrayloides (Kieffer, 1911), Macropelopia nebulosa (Meigen, 1804), Mallochohelea setigera (Loew, 1864), Mallochohelea sp., Microchironomus tener (Kieffer, 1918), Microtendipes pedellus (de Geer, 1776), Mochlonyx sp., Nanocladius bicolor (Zetterstedt, 1838), Odontomyia sp., Palpomyia sp., Palpomyia schmidti Goetghebuer, 1934, Paratanytarsus confusus Palmen, 1960, P. gr. lauterborni, Paratanytarsus sp., Parachironomus varus Goetghebuer, 1921, Podura aquatica Linnaeus, 1758, Polypedilum nubeculosum (Meigen, 1804), P. bicrenatum Kieffer, 1921, P. pedestre (Meigen, 1830), P. sordens (van der Wulp, 1874), Procladius ferrugineus (Kieffer, 1918), P. choreus (Meigen, 1804), Psectrocladius flavus (Johannsen, 1905), P. sordidellus (Zetterstedt, 1838), Sphaeromias pictus (Meigen, 1818), Stictochironomus crassiforceps Kieffer, 1922, S. rosenschöldi (Zetterstedt, 1781), Tanypus punctipennis (Meigen, 1818), Tanytarsus usmaënsis Pagast, 1931, T. gr. gregarius, and T. kharaensis Zorina et Zinchenko, 2009
Lake Elton basin
Phylum Arthropoda Class Insecta	Order Heteroptera	Sigara sp.
	Order Coleoptera	Enochrus quadripunctatus (Herbs, 1797), Berosus sp., Hygrotus sp.
	Order Diptera	Chironomus salinarius Kieffer 1915, Cricotopus salinophilus Zinchenko, Makarchenko et Makarchenko, 2009, Ephydra sp., Palpomyia schmidti Goetghebuer, 1934, and Tanytarsus kharaensis Zorina et Zinchenko, 2009