Eutylenchus gracilis sp. n. (Tylenchidae), Eumonhystera sibirica sp. n. (Monhysteridae) and the hitherto unknown male of Tridentulus brzeskii (Gagarin & Gusakov, 2000) (Monhysteridae) from Arachley Lake, situated in Siberia, Chita Prov., Russia, are described and illustrated.

Paraplectonema vietnamicum sp. n. (Plectidae), Paraphanolaimus asiaticus sp. n. (Halaphonolaimidae) and Parodontophora obscurus sp. n. (Axonolaimidae) from freshwater bodies of Vietnam are described and illustrated.

Setsalia mirabilis gen. et sp. n. (family Tobrilidae) is described from Lake Baikal. The new species is characterized by the well-developed dorsal tooth and two subventral teeth in the stoma. Structure of the stoma in tobrilids and its possible evolutionary changes are discussed. The emended diagnosis and a key to the genera of the subfamily Tobrilinae are given.

Tetrastemma kangauzi sp. n. from the Sea of Japan (Peter the Great Bay) is described. Internal morphology of T. laminariae Uschakov, 1928 from Barents Sea (Kola Bay) is briefly redescribed.

The systematic position of two species of Lymnaeidae, Lymnaea vulnerata (Küster, 1862) and L. occulta (Jackiewicz, 1959), is discussed. On the basic of anatomical features, Lymnaea vulnerata is included in the subgenus Corvusiana Servain, 1881, the section Kuesterilymnaea sect. n. A new synonymy is established: Lymnaea terebra (Westerlund, 1884) = L. occulta (Jackiewicz, 1959), syn. n. (not syn. of L. vulnerata).

Mirollia rostellum sp. n. from Philippines is distinguished from all other congeners by the shape of male cerci, male genital plate, and male genital sclerites.

Morphology of nauplii is studied in specimens of the Cyclops scutifer group, mainly from lakes of North-Eastern Russia. The revealed variability testifies to the species heterogeneity of the group.

Pseudoamallothrix paralaminata sp. n. is described from the Arctic Basin. The new species is very close to P. laminata (Farran, 1926) and O. profunda (Brodsky, 1950), but clearly differs from these in several characters of male and female. Xanthocalanus soaresmoreirai Bjornberg, 1975 described from male has a number of morphological features never observed in Xanthocalanus (fam. Phaennidae) but typical of the genus Pseudoamallothrix (fam. Scolecitrichidae); in some characters, this species is close to P. ovata (Farran, 1905). X. soaresmoreiraiis transfered to the genus Pseudoamallothrix (comb. n.). A transformation of setae on apical and subapical segments of the male maxilliped as a synapomorphic character for the family Scolecitrichidae is recorded for the first time.

Two new species of the genus Duolandrevus Kirby (with unclear subgeneric position) from Sumatra are characterized by the structure of the male tegmina, male anal plate, and the male genitalia.

Forelia orientalis sp. n. (fam. Pionidae) and Axonopsis (Axonopsis) japonicus sp. n. (fam. Aturidae) are described from the Japanese lake Biwa. Both species are known from females only.

The systematic position and phylogeny of the subfamilies Perisphaeriinae and Panesthiinae, and the genus Paranauphoeta Brunn. are discussed. The tribe Paranauphoetini Rehn, 1951 is raised in rank to subfamily. The genera Paranauphoeta, Trichoblatta Sauss. & Zehn., Glomerexis B.-Bien. and Perisphaerus Serv. are rediagnosed. A new species, T. beybienkoi sp. n., and a new subspecies, Paranauphoeta vicina vietnamensis ssp. n., are described. For T. valida B.-Bien., Perisphaerus semilunatus Han. and P. punctatus B.-Bien., the male is described for the first time. For Paranauphoeta nigra B.-Bien., P. indica Sauss. & Zehn., P. vicina Brunn., P. v. sinica B.-Bien., P. lyrata (Burm.), P. rufipes Brunn., P. formosana Mats., T. magnifica (Shelf.), T. aerea (B.-Bien.), T. fallax B.-Bien., T. montshadskii B.-Bien., T. semisulcata (Han.), T. valida, T. v. moderata B.-Bien., T. sculpta (B.-Bien.), T. tarsalis (Walk.), T. humbertiana (Sauss.), T. pilosa (B.-Bien.), G. tibetana B.-Bien., Perisphaerus semilunatus, and P. punctatus, data on the morphology and geographical distribution are given.

Lectotypes are designated for five nominal species of Aelia and Neottiglossa.

A total of 13 Indo-Malayan and Afrotropical species belonging to six genera from four tribes of the subfamilies Cachoplistinae and Phaloriinae are considered. A new tribe, two new genera, two new subgenera, eight new species, and a new subspecies are described. Some other taxa are characterized (including revisions of type material, information about systematic position, and new data on distribution). Two names are restored: Cacoplistes indicus (Chop.), sp. dist. and Meloimorpha albicornis (Walk.), sp. dist. Two names are lowered in rank: M. japonica yunnanensis (Yin), stat. n. and Vescelia pieli ryukyuensis (Oshiro), stat. n. et comb. n.

Lectotypes are designated for 23 Kolenati’s species and varieties in the Museum of Natural History, Vienna. The synonymies of Rhabdocoris arcuata Kolenati, 1845 with Leptocorisa acuta (Thunberg, 1783) and of Eurydema armeniacum Kolenati, 1846 with E. fieberi Fieber, 1837 are restored. The following new synonymies are established: Liorhyssus hyalinus (Fabricius, 1794) = Corizus rubescens Kolenati, 1845; Sehirus luctuosus Mulsant & Rey, 1866, nomen protectum = Cydnus affinis var. ibericus Kolenati, 1846, nomen oblitum; Geotomus elongatus (Herrich-Schaeffer, 1840) = Cydnus caucasicus Kolenati, 1846 (G. ciliatitylus Signoret, 1881 is a good species, not synonymous with C. caucasicus); Eurygaster integriceps Puton, 1881, nomen protectum = E. hottentotta var. obliqua Kolenati, 1846, nomen oblitum.

The following new synonymy is established: Hygia opaca (Uhler, 1860) = H. japonica Ahmad, 1969, syn. n., H. lativentris (Motschulsky, 1866) = H. touchei (Distant, 1901), syn. n. Hygia opaca opaca sensu Ahmad, 1969 is a misidentification of H. lativentris (Motschulsky, 1866), the latter species does not belong to the subgenus Microcolpura. The records of H. obscura (Dallas, 1852) from Korea and China are considered mistakes.

The paper includes designations of type species for two nominal genera, lectotype designations for 7 nominal species, new records, new synonymy, and some other notes on nomenclature and distribution. The following new synonymies are established: RHOPALIDAE: Leptocoris rufus Hahn, 1833, sp. dist. (not syn. of L. abdominalis (Fabricius, 1803)) = L. isolatus (Distant, 1914); Rhopalus distinctus (Signoret, 1859) = Rh. albicarinus Liu & Nonnaizab, 1988; ACANTHOSOMATIDAE: Cyphostethus tristriatus (Fabricius, 1787) = C. minitristriatus Ahmad & Önder, 1993 = C. pallidus Ahmad & Önder, 1993; Acanthosoma denticaudum Jakovlev, 1880 = A. d. japonica Jensen-Haarup, 1931; SCUTELLERIDAE: Odontoscelis hispanica Göllner-Scheiding, 1987 = ? O. fuliginosa var. dorsata Kirkaldy, 1909; Phimodera humeralis (Dalman, 1823) = Ph. hispanica Fuente, 1971; Eurygaster integriceps Puton, 1881, nomen protectum = E. cognatus Westwood, 1837 = E. orientalis Westwood, 1837; E. testudinaria testudinaria (Geoffroy, 1785) = E. sodalis Horváth, 1895.

Lectotypes are designated in the collection of the Museum National d’Histoire Naturelle, Paris, for 4 varieties or forms described by d’Antessanty (1891), Royer (1911) and Péneau (1911).

Five Stygnocoris species from the territory of Russia and adjacent countries are keyed. Their distributions in Russia and adjacent countries, based on the collection of the Zoological Institute, St.Petersburg, are mapped. New synonymies are established: S. cimbricus (Gredler, 1870) = S. pilosulus (Thomson, 1870) = S. pygmaeus auct. (non R.F. Sahlberg); S. sabulosus (Schilling, 1829) = S. pygmaeus (R.F. Sahlberg, 1848).

The following new synonymies are established: Neottiglossa leporina (Herrich-Schaeffer, 1830) = N. leporina valenciana Wagner, 1960 = N. irana Wagner, 1963; Eysarcoris ventralis (Westwood, 1837) = E. hispalensis Fuente, 1971 = E. confusus Fuente, 1971 = E. uniformis Fuente, 1971 = E. luisae Fuente, 1971.

Pupae of Epuraea (Dadopora) guttata (Olivier, 1811) and Meligethes (Clypeogethes) ?ruficornis (Marsham, 1802), collected in Zhiguli Nature Reserve (Samara Prov.), are described for the first time and compared with descriptions and drawings available from previous publications. Pupal characters of the subfamilies of Nitidulidae are discussed, and those of the family as a whole are given.

A new species of ichneumon-flies, Syndipnus saotis sp. n. of the tribe Euryproctini, is described from the Subarctic zone of Europe and Siberia.

Six new species of the encyrtid genus Metaphycus are described from Mexico: M. celticola sp. n., M. farfani sp. n., M. karwinskiae sp. n., M. sergueii sp. n., M. superbus sp. n., and M. tuxpan sp. n. All new species belong to insidiosus-group. The soft scale insect Differococcus argentinus (Morrison), the host of M. celticola, is recorded from Mexico for the first time.

Two new species of Eulophidae are described and illustrated, Euplectromorpha emeljanovi sp. n. from Ethiopia and Hoplocrepis mexicana sp. n. from Mexico.

Correct dates of publication are indicated for two papers, in which Euplectrus thanhi Yefremova, 1994 has been described as a new species. The publication in “Trudy Zool. Inst. Ross. Akad. Nauk” has priority.

Meromyza hugoanderssoni sp. n. is described from Kashmir, India. The new species belongs to the pratorum species group.

The holotype of Plocamia fragilis Koltun, 1959 is examined. P. fragilis is shown to be a junior synonym of Wigginsia wigginsi de Laubenfels, 1953 (new synonymy). The species is distributed along both the American and Asian coast of North Pacific and in the Chukchi Sea.

Chronogaster pseudotypica sp. n. (fam. Chronogasteridae) and Dorylaimellus vietnamicus sp. n. (fam. Belondiridae) from freshwater bodies of Vietnam are described and illustrated.

A list of 17 species collected in 1982 is given. Six species (two of them identified to the generic level only) are new to the fauna of the Posyeta Bay.

Protetrastemma gen. n. (type species Tetrastemma viridis Kulikova, 1989) and Quasitetrastemma gen. n. (type species Tetrastemma nigrifrons Coe, 1904) are established. Quasitetrastemma stigmatum (Yamaoka, 1940), comb. n. is reinstated as a valid name.

Morphological analysis is done of the rounded structures in the head part of euconodont imprints from the Carboniferous deposits of Granton (Scotland), and the Ordovician Soom Shale (South Africa) and the rounded phosphatic structures present separately in the Upper Silurian and Upper Devonian deposits of Germany and Lower Triassic deposits of Primorsk Terr. (Russia). The identity of these structures in morphology and ontogenetic stages testifies that all of them belong to euconodonts. The rounded head structures of euconodonts, or H elements (Buryi & Kasatkina, 2001), appear to be analogous to the skeletal attaching plates of Chaetognatha. They were arranged in pairs in the anterior part of head in front of the tooth apparatus symmetrically to the sagittal axis of the euconodont and their surface was completely coated with a soft connective-muscular tissue like a cap. The H skeletal elements are rather a part of the mouth assemblage of euconodont animals along with the pharynx, P, M, and S elements of the tooth apparatus, and muscles (connective-muscular tissue). The presence of skeletal attaching plates (H elements) in euconodonts is responsible for the unique structure of the head part and of the whole animal (the euconodont mouth is arranged along the sagittal axis between the H elements). This supports recognition of these animals as a separate type, Euconodontophylea (Kasatkina & Buryi, 1999).

Aphis helianthemi Ferr. is recorded from Minsk Prov. of Byelorussia. The geographical distribution of this species is discussed.

Eucyclops leschermoutouae sp. n. is described from a well located in the vicinity of Soller (Majorca, Balearic Islands, Spain). This new species belongs to the serrulatus-group and can be distinguished from its nearest congeners by a set of characters, which includes the fine armature of the antennar basipode and coxa of the swimming leg 4, and the relative lengths of the caudal setae. Taxonomic differences of the new taxon and closely related species from Africa, Asia and Americas are discussed.

The type locality of Regoza brevipennis Gorochov & Kostia, 1999 and apparently also that of Gialaia africana Gorochov & Kostia, 1999 are situated in Madagascar, not in Tanzania.

Illustrated descriptions of two water mite species, Torrenticola amplexoides sp. n. (female) from the North Caucasus and T. abbreviatella sp. n. (male) from flowing waters of European Russia, are given.

Redescriptions of poorly known species Pycnoscelus rufus B.-Bien. (Blaberidae, Pycnoscelinae), Heminauphoeta picea Shelf. (Blaberidae, Oxyhaloinae) and Eutheganopteryx mirabilis Shelf. (Blattellidae, Ectobiinae), based on the type material, are given. The male genitalia of these species are described for the first time. Lectotypes of H. picea and E. mirabilis are designated.

Itara (Itara) palawanensis sp. n. from Philippines is described. I. (Noctitara) sonabilis Gor. is recorded from North Vietnam for the first time.

Anisolabis decorata sp. n. is described from Sichuan, South China.

Twelve genera belonging to a generic group with relatively primitive type of the male genitalia are characterized. They are distributed mainly in Madagascar, but some are known also from the Seychelles and Comores or from Africa; one genus possibly belonging to this group is known from Africa only. Six new genera, one new subgenus, and 24 new species are described; several other species are considered (including revisions of type material and information about systematic position of some forms). New synonymy is established: Kilimagryllus africanus (Walker, 1869) = Platydactylus fuliginosis Walker, 1869, syn. n. Lectotypes of Fryerius aphonoides and K. africanus are designated.

Pachycoleus pusillimus (J. Sahlberg, 1870) is recorded from Voronezh Province of Russia for the first time.

Orius agilis (Flor) (Anthocoridae) and Cremnocephalus albolineatus Reuter (Miridae) are recorded from Leningrad Province of Russia for the first time.

A new subgenus of the issid genus Bubastia Emeljanov, 1975 is erected – Capititudes subgen. n. (type species: Bubastia jatagana Dlabola, 1980) and subgeneric arrangement of the species is proposed. Hysterodus Dlabola, 1980 is placed in synonymy with Quadriva Ghauri, 1965 and Parahiracia Ôuchi, 1940 with Fortunia Distant, 1909 (Issidae). The following species names (Issidae) are placed in synonymy: Issus quadriguttatus Walker, 1851 with I. coleoptratus (Fabricius, 1781), Issus furtivus Walker, 1857 with I. praecedens Walker, 1857, Bubastia libanotica Dlabola, 1987 with B. ephialtes (Linnavuori, 1971), B. quadracuta Dlabola, 1980 with B. suturalis (Fieber, 1877), and Tshurtshurnella zebrina Dlabola, 1987 with T. trifasciata (Linnavuori, 1965). Hysteropterum maroccanum Lethierry, 1877 is transferred to the genus Bergevinium Gnezdilov, 2003, Mycterodus tunicatus Logvinenko, 1974 and M. allotrius Lukjanova, 1991 to the genus Quadriva Ghauri, 1965, Kervillea insulana (Dlabola, 1982) to the genus Rhissolepus Emeljanov, 1971, Prosonoma viridis Lallemand, 1942 to the genus Fortunia Distant, 1909, Colpoptera memnonia Fennah, 1955 to the genus Neocolpoptera Dozier, 1931 (Issidae), and Hysteropterum truncatellum Walker, 1851 to the genus Bilbilicallia Jacobi, 1928 (Nogodinidae). The genera Fortunia Distant, 1909, Scantinius Stеl, 1866, Pterygoma Melichar, 1903, Prosonoma Melichar, 1906, and Bardunia Stеl, 1863 are transferred to the tribe Parahiraciini Cheng & Yang, 1991 (Issidae). The genera Eupilis Walker, 1857, Tempsa Stеl, 1866, Gabaloeca Walker, 1870, Cheiloceps Uhler, 1895, and Ugoa Fennah, 1945 are transferred to the tribe Colpopterini Gnezdilov, 2003 (Issidae). New data on distribution of some species of the families Issidae, Caliscelidae, and Tropiduchidae are provided.

Salda sahlbergi Reuter is recorded for the first time from the North Urals (Komi Republic) and Taimyr Peninsula. These records show that the distribution range of this species in northern Eurasia is most likely not disjunct.

The synonymy of L. adspersus with L. gemellatus is restored. L. gemellatus f. adspersus corresponds to the overwintering generation in the southern part of the species range and to the single generation in the colder regions.

Two new species of Ectrichodiinae from Sichuan, China are described from single females. Both new species, Parascadra puetzi sp. n. and P. breuningi sp. n., are micropterous. Until now, only macropterous and submacropterous species were known in the group of genera comprising Scadra, Parascadra, Scadrana, and Neoscadra.

A faunal list of Heteroptera collected in the Kuril Islands by the American participants of the International Expedition in 1994-1999 and by the Russian participants in 1996-1997 is given. Of the 121 species reported, seven are new to the fauna of the archipelago and many are recorded for the first time from particular islands, especially from Northern and Middle Kurils and smaller islands of the Habomai group. An updated list of Heteroptera of the Kuril Islands (236 species) is given. The distribution of species in the archipelago is briefly discussed.

A new species, Phradis decameron sp. n., with 10-11-segmented antenna, is described from the Ukraine. This is the minimum number of antennal segments known in the family Ichneumonidae.

The composition of the subfamily Brachistinae is discussed. A new species, Schizoprymnus erzurumus sp. n. from Turkey, is described and illustrated.

The genera Allurus Förster and Asiacentistes Belokobylskij are recoerded from Taiwan for the first time. A new species, Allurus choui sp. n. from Taiwan, is described and illustrated.

The taxonomic position of the Afro-Neotropical genus Rinamba is discussed and this genus is transferred to the subfamily Doryctinae. New synonyms are suggested: Rinamba Cameron 1912 = Pseudorhoptrocentrus Granger, 1949, syn. n. = Rhoptrocentroides Marsh, 1993; Rinamba opacicollis Cameron, 1912 = Neodoryctes niger Szépligeti, 1914, syn. n.; Hemidoryctes Belokobylskij, 1993 (March) = Atopodoryctes Marsh, 1993 (December), syn. n.; Heterospilus carbonarius Ashmead, 1894 = Hemidoryctes soror Belokobylskij, 1993, syn. n. A key to species of the genus Rinamba is provided.

Diogma caudata Takahashi is recorded from the Perm’ Prov. of Russia.

Sancarlosia tamaulipeca gen. et sp. n. is described from Mexico, State of Tamaulipas. The new genus is compared with the genera Cyderius Noyes and Lohiella Noyes. A list of 44 world genera of Encyrtidae, parasitoids in Coccidae is added.

Ogcodes shirakii Schlinger, described from Japan, is found in the Primorsk Terr. of Russia.

A new species, Adoxomyia transcaucasica, is described from Azerbaijan and Armenia. A. portschinskii Pleske is synonymized with A. dahlii Meigen. New data on the distribution of A. dahlii, A. ruficornis Loew and A. obscuripennis Loew are given. A. obscuripennis known from Middle Asia and the Caucasus is found in the southern part of Srednerusskaya Elevation on calk hills in a landscape named “low alps”.

A list of 44 Dolichopodidae species collected in the Tyresta National Park and Nature Reserve is given. Rhaphium viklundi sp. n. is described from this locality, and a key to Swedish species of the Rhaphium albifrons group is given. Medetera inspissata Collin is recorded from Sweden for the first time.

Riedelia bicolor Mesnil known up to the present from Primorsk Territory and China is for the first time recorded from Japan.

An annotated checklist of Karelian Dolichopodidae is presented including a total of 122 species, 41 of which are new Karelian records.

Chaetexorista pavlovskyi Stackelberg is shown to be the valid name for the species of Chaetexorista parasitizing Monema flavescens Walker (Limacodidae) in Primorsk Territory and Japan. Phorocerosoma vicarium Walker, Pales angustifrons Mesnil, Blepharipa gigas Mesnil are for the first time recorded from Russia.

24 species of tachinids are recorded from Kamchatka, among them 22 species, for the first time.

Based on reexamination of original descriptions, type materials, comparative material, and a wide literature the present data on nomenclature and taxonomy of several taxa of freshwater fishes important because of a big deal of uncertainty connected with their identification and/or status are critically analysed. Discussed are Macropodus ocellatus, Acanthorhodeus, A. asmussii, A. macropterus, Rhodeus amurensis, Cyprinus rubrofuscus, Parabotia mantchurica, Lefua, L. costata, L. pleskei, Pelteobagrus, P. mica, P. argentivittatus, Pseudobagrus, P. ussuriensis, P. herzensteini.