A specimen of the pelagic polychaete Pedinosoma curtum Reibisch (Lopadorhynchidae) is described from the North-West Pacific. It differs from the Atlantic specimens of the species in longer aciculae, larger antennae as compared with palps and pigmentation of the dorsal cirri. A late larva of Pedinosoma рolaris sp. nov. is described from plankton of the Arctic Basin (depth 2000–1000 m). The distinctive characters of the new species are: podial lobes, aciculae and compound chaetae present on the tentacular segment, the absence of cirrophores of the tentacular and ventral podial cirri, the podial cirri arranged on the podial process, and a well-developed pygidium bearing anal cirri. An additional diagnosis of the genus Pedinosoma Reibisch is provided.

The endemic American tribe Hapithini Gorochov, 1986 is divided into three subtribes: Hapithina stat. nov., Cearacesaina stat. nov. (= Cearacesaini Koçak et Kemal, 2010) and Aphonomorphina Desutter, 1988 (the latter subtribe is transferred from Podoscirtini). The following former genera of Hapithina are included in the genus Hapithus Uhler as its subgenera or as their synonyms: Hapithus s. str. (= Alexandrina Otte et Perez-Gelabert, syn. nov.; = ? Sipho Otte et Perez-Gelabert), Mashiyana Otte et Perez-Gelabert, stat. nov. (= ? Margarettia Otte et Perez-Gelabert and Knyella Otte et Perez-Gelabert), Orocharis Uhler, stat. nov. (= ? Walkerana Otte et Perez-Gelabert and Carylla Otte et Perez-Gelabert), Laurepa Walker, stat. nov., Antillicharis Otte et Perez-Gelabert, stat. nov., as well as Sabelo Otte et Perez-Gelabert and Laurellia Otte et Perez-Gelabert with unclear position inside Hapithus s. l. The following new taxa (49) are described from Neotropical region: Curiocharis subgen. nov. (in Hapithus s. l.), Hapithus (Hapithus) klugei sp. nov., H. (H.) palenque sp. nov., H. (Antillicharis) vulgaris sp. nov., H. (A.) v. chiapas subsp. nov., H. (A.) lacandona sp. nov., H. (A.) honduras sp. nov., H. (A.) fascifer sp. nov., H. (A.) selva sp. nov., H. (A.) haiti sp. nov., H. (A.) proxima sp. nov., H. (A.) celerans occidentalis subsp. nov., H. (Laurepa) jalisco sp. nov., Somnambula specularis gen. et sp. nov., S. ucayali sp. nov., Gryllophyllus magnispeculum gen. et sp. nov., Phyllogryllus robustus sp. nov. [Hapithina]; Cearacesa morona sp. nov., C. satipo sp. nov., Barota bolivia gen. et sp. nov., Taroba peru sp. nov., T. dea sp. nov., T. d. ecuador sp. nov., T. amboro sp. nov., T.? elchaco sp. nov., T.? rotundata sp. nov., T.? variegata sp. nov., T.? v. abbreviata subsp. nov. [Cearacesaina]; Aphonomorphus (Aphonomorphus) pileatus sp. nov., A. (A.) segregus sp. nov., A. (A.) montanus zamora subsp. nov., A. (Euaphonus) cusco sp. nov., A. (Lobaphonus) distinctus calabaza subsp. nov., Spiraphonus asymmetricus napo subsp. nov. [Aphonomorphina]; Angustitrella mataraku sp. nov., Paroecanthus tamaulipas sp. nov. [Paroecanthini: Paroecanthina]; Tafalisca? huanchaca sp. nov., Cylindrogryllus (Apterotrypa) noeli subgen. et sp. nov., C. (Neometrypus stat. nov.) aculeatus argentinus subsp. nov., C. aguarico sp. nov., C. sympatricus sp. nov., C. signatus sp. nov. [Paroecanthini: Tafaliscina]; Diatrypa (Diatrypa) glandulifera sp. nov. [Aphonoidini: Diatrypina]; and Dicerorostrum diceros gen. et sp. nov. [Podoscirtinae incertae sedis]. Keys for subgenera of the genera Hapithus and Cylindrogryllus Sauss. are given; the former genus Neometrypus Desutter is included in the latter genus as its subgenus; H. aphaeretos Otte et Perez-Gelabert, syn. nov. is synonymized to H. kerzhneri Gor.; a new female of the latter species is described; the former species Aphonomorphus desutterae Cadena-Castañeda et Noriega and subspecies Paroecanthus aztecus verapas Gor. are considered as a subspecies (A. solitarius desutterae stat. nov.) and a species (P. verapas stat. nov.), respectively; systematic position and distribution of some other taxa are clarified.

Ovaliptila rhodos sp. nov. is described from Rhodes I., Greece. This species is most similar to O. buresi (Mařan) but distinguished from the latter species by some structures of the male genitalia.

Nine species of the genus Hebarditettix are found in Vietnam; H. chamensis sp. nov., H. fuscus sp. nov., H. gibbus sp. nov., H. intermedius sp. nov., H. magnus sp. nov., and H. oculatus sp. nov. are described from this country. A key to Vietnamese species of Hebarditettix is provided.

A new species of the genus Issus Fabricius, 1803 is described from Montenegro. European fauna of the genus Issus is discussed.

Sarnus rhomboidalis Fennah, 1965 is redescribed and recorded for the first time from Fianarantsoa Province of Madagascar which is the first record of Neotropical issid species from Madagascar.

The paper deals with the taxonomy of two species of the subgenus Trachycarabus Géhin, 1876 of the genus Carabus Linnaeus, 1758, occurring in the Altay Mountains in the Xinjiang Uygur Autonomous Region of China: C. (T.) mandibularis Fischer von Waldheim, 1828 and C. (T.) sibiricus Fischer von Waldheim, 1820. A new subspecies, C. (T.) mandibularis abakkereiorum subsp. nov. is described from the Kran River Valley near Altay City. A new synonym is proposed: C. (T.) sibiricus obliteratus Fischer von Waldheim, 1828 = C. (T.) s. pseudobliteratus Korell et Kleinfeld, 1982, syn. nov. A key to the Trachycarabus species currently known from Xinjiang is given.

Two new species of net-winged beetles, Flagrax ziminae sp. nov. and F. vanschuytbroecki sp. nov., are described from the Albertine Rift (Rwanda and eastern Democratic Republic of the Congo). General view and aedeagi of these new species and of F. grandis (Kleine, 1942) as well as the aedeagus of F. auberti (Bourgeois, 1881) are illustrated. A key to the Flagrax species with uniformly testaceous elytra is provided.

Two species of the genus Eusterinx Förster from the Mexican State of Tamaulipas are described: E. (Divinatrix) longipes sp. nov. and E. (Ischyracis) tenuiventris sp. nov.

A new species of the genus Dinotrema Foerster, 1863 with enlarged propodeal spiracles, D. kovali sp. nov. collected in the Mangupskaya I Cave on Baba-Dagh Mountain (Baba-Dagh Plateau) of the Bakhchisaray District of Crimean Peninsula, is described and illustrated. A new species is the most similar to the Western Palaearctic D. erythropum Foerster, 1863 and D. stigmaticum (Tobias, 1992). This is the first record of the genus Dinotrema in the caves of the Eastern Europe.

A brief review of three subspecies of Zegris eupheme (Esper, [1804]) known from the territory of the former USSR is proposed and its diagnostic features are listed. The neotype of Zegris eupheme tschudica Herrich-Schäffer, [1850] and lectotypes of Z. eupheme sulphurea O. BangHaas, 1927, Pontia erothoe Eversmann, 1832 and Papilio eupheme Esper, [1804] are designated. Zegris eupheme tschudica Herrich-Schäffer, [1850] is synonymized to Zegris eupheme erothoe (Eversmann, 1832); Zegris eupheme dyala Peile, 1921 and Zegris eupheme tigris Riley, 1921 are synonymized to Zegris eupheme menestho (Ménétriés, 1832).

Since publication of the previous list (Litvinov & Podolyako, 2013), new data on species composition of fish fauna in the Astrakhan State Reserve have been obtained. As a result of revisions of the collected material and new records (e.g., the first finding of Khvalyn spined loach Cobitis amphilekta Vasil’eva, Vasil’ev, 2012), the list of fish species has been corrected and widened. At present, the list of fish species in the Reserve includes one species of Petromyzontidae and 60 species of Acipenseridae, Clupeidae, Cyprinidae, Cobitidae, Siluridae, Coregonidae, Salmonidae, Esocidae, Lotidae, Atherinidae, Gasterosteidae, Syngnathidae, Percidae, and Gobiidae. Identifications used in previous lists of fishes found in the Astrakhan reserve in 1936–2016 and brief information on biology and dates of latest records of each species are given.

Two rare catenulid species, Myostenostomum vanderlandi Rogozin, 1992 and M. bulbocaudatum Luther, 1960, were found in reservoirs of the Volga-Kama Biosphere Reserve (Middle Volga Basin, Russia) during a survey of microturbellaria in 2013. Both the species were recorded for the first time in the fauna of the Volga Basin, while M. vanderlandi, previously known only from water bodies of South America, was first found in the Holarctic. The morphological characters and geographical distribution of the species are discussed.

A description of Monhystrella andreana sp. nov. from brackish water lake Tierra del Fuego, Chile, is given. The new species differs from the most morphologically close M. macrura (de Man, 1880) mainly in shorter tail and pharynx (esophagus), and in longer spicules.

A new species, Isoschizoporela marisweddelli sp. nov., from the bryozoan order Cheilostomatida was described within the genus endemic for Antarctic waters. Fragments of colonies of the species were found in the Weddell Sea by the German Antarctic Expedition ANT XIII/3 on the research vessel “Polarstern” in 1996. The species is distinguished from the other species of Isoschizoporella by the incrusting colony, elongate, hexagonal and convex autozooids, semicircular primary orifice with shallow sinus, strongly convex avicularian chamber, avicularium with semicircular mandible, and additional avicularium on frontal surface of autozooid. The species belongs to the infraorder Ascophora, superfamily Schizoporelloidea.

The fossil impressions of tubes belonging to the bristle worms of the family Pectinariidae and probably the genus Pectinaria Savigny, 1818 was found at the coastal cliffs of the Tartar Strait (Southern Sakhalin) in deposits of the late Miocene Kurasi Formation. Rare mentions of findings of impressions of the polychaetes tubes perhaps may be explained by the fact that such impressions are misidentified as fossils of animals from other higher taxa. Some new data on the bionomics of the recent pectinariids are given and some taphonomical aspects of the group are considered.

The taxonomy of freshwater pulmonates (Hygrophila) relies heavily on morphology of their reproductive system, most notably on the characters of the copulatory apparatus. For this reason, taxonomically important components of the copulatory apparatus such as penial stylets have always received much attention in the morphological studies on Hygrophila. The present study describes the stylets of Kolhymorbis bogatovi Zatrawkin et Moskvicheva in Zatrawkin, 1985 and K. shadini Starobogatov et Streletzkaja, 1967 and compares them with the previously described stylet of K. angarensis (Dybowski et Grochmalicki, 1925). The lengths of the stylets vary within the genus from 20 to 30 μm. In K. bogatovi, the stylet is a trough-shaped plate with a distal portion twisted 110° counterclockwise with respect to the proximal portion. The stylet of K. shadini is also a trough-shaped plate, but its walls are curved in such a way that the stylet forms a hollow cone with a beveled tip. The slit between the opposite lateral flanks of the stylet is wide proximally, but narrows down distally. The stylets of all three Kolhymorbis species differ markedly in their shape. The trough-shaped stylet of K. angarensis most likely represents the plesiomorphic state; the stylet of K. bogatovi may have originated from this type of stylet by increasing the curvature of the walls and counterclockwise twisting of the distal portion of the stylet. The cone-shaped stylet of K. shadini may have evolved from the plesiomorphic type by widening of the proximal portion and by even more pronounced curving of the walls throughout the length of the stylet without distal twisting. The penial stylets of Kolhymorbis species are compared with those of Palaearctic genera of the family Segmentinidae Baker, 1945 and the taxonomic utility of the stylet characters is evaluated.

Eight new taxa belonging to the tribe Landrevini are described from Laos, Malaysia and Indonesia: Duolandrevus (Eulandrevus) namlik sp. nov.; D. (Duolandrevus) matang sp. nov.; D. (D.) spinicauda gading subsp. nov.; D. (Bejorama) lambir sp. nov.; Endodrelanva aliena sp. nov.; E. similajau sp. n.; Endolandrevus? buton sp. nov.; E.? papua sp. nov. These taxa are distinguished from each other and from the all previously described congeners by body colouration, tegminal structure, peculiarities of male metanotal gland, and/or shape of some genital parts. Additional data on distribution of some old species are also provided.

The composition, distribution, morphology and bionomics of the cricket subfamily Bothriophylacinae are briefly discussed. The following taxa are described and redescribed on the base of type material: Microbothriophylacini Gorochov trib. nov.; Eremogryllodes iranicus Tahami et Gorochov sp. nov., E. persicus Tahami et Gorochov sp. nov., E. p. torangae Tahami et Gorochov subsp. nov., E. p. lari Tahami et Gorochov subsp. nov., E. dilutus Tahami et Gorochov sp. nov., E. d. bakhtiyari Tahami et Gorochov subsp. nov. and E. bifurcatus Tahami et Gorochov sp. nov. from Iran; E. b. turcicus Gorochov et Ünal subsp. nov. from Turkey; E. major Chopard from Afghanistan; E. monodi Chopard from North Africa; Bothriophylax kiritshenkoi Gorochov et Tahami sp. nov.; B.? richteri Chopard from Iran; and B. rjabovi Gorochov sp. nov. from Armenia. Key to tribes and genera of Bothriophylacinae is also prepared.

This article is an addendum to the revision of the tribe Cryptini of Mexico (Kasparyan & Ruíz- Cancino, 2008a). Two new species, Lymeon alboniger sp. nov. and L. maculipennis sp. nov., from the State of Veracruz, Mexico, are described.

A new species of the tribe Hemigasterini, Platymystax xalapa sp. nov., is described from the Mexican State of Veracruz. It is the first species of the genus described from the New World. A preliminary identification key to all known seven species of Platymystax of the world fauna is provided.

The genus Cleptes Latreille, 1802 is recorded from Mongolia for the first time. The hitherto unknown male of Cleptes dauriensis Móczár, 1997 is described and illustrated.

Colpopyga Semenov, 1954, a chrysidid genus of the tribe Elampini (Chrysididae: Chrysidinae) with four Palaearctic and one Nearctic species, is reviewed. The study of internal urites (Noskiewicz & Lorencova, 1963) and new molecular data (Niehuis, pers. comm.) show a generic status of Colpopyga, which is more related to the genus Holopyga Dahlbom, 1854. A new species, Colpopyga nesterovi sp. nov. from Kazakhstan, is described and illustrated; it is easily recognizable by the red-coppery body coloration and shallow, small and sparse punctures. The status of the subspecies Hedychridium flavipes temperatum Linsenmaier, 1959 is updated to species level in the genus Colpopyga (comb. nov.). New generic combinations are also proposed for C. aureiventris (Mercet, 1904), comb. nov. and C. crassa (Bohart, 1978), comb. nov. (all from the genus Hedychridium). The lectotype of Hedychridium flavipes var. cyanomaculatum Trautmann, 1927 is designated.

The Neotropical genus Pseudophorticus Erwin, 2004 is reported from the Eastern Hemispere for the first time. Two new species, P. constricticollis sp. nov. and P. tetragonoderoides sp. nov. are described from Vietnam; within the former species, two subspecies are recognized: the nominotypical one (central Vietnam) and P. constricticollis tonkinensis ssp. nov. (northen Vietnam). Additional records of Selina westermanni Motschulsky, 1858 in Vietnam are given. Aeolodermus emarginatus (Chaudoir, 1872) is first reported from Vietnam.

The article deals with diagnostic characters, distribution including additional faunal records, and ecology of Sphaerites perforatus Gusakov, 2017 and S. nitidus Löbl, 1996. A redescription of S. perforatus with indication of additional morphological characters is given. Wings venation of S. perforatus, S. nitidus, and S. glabratus (Fabricius, 1792) is analysed. A key to all species of Sphaerites Duftschmid, 1805 is given.

Thinophilus sinclairi sp. nov. is described from the coast of the Sea of Azov, Ukraine, and from northern Kazakhstan. The new species is similar to T. spinitarsis Becker but differs from it in the structure of the hypopygium, apex of fore tibia without long black dorsal seta, and segments 2–4 of fore tarsi with long posterodorsal black setae.

A wingless species Elachiptera viator Nartshuk, 1971 in the family Chloropidae is recorded from China (Beijing) for the first time. A redescription of the species is given with the figures of its characteristics and the genitalia of both sexes. A checklist of seven species of the genus Elachiptera known from China with their distribution and a key to the Chinese and Oriental species of the genus are given. The following new combinations are proposed: Lasiochaeta bengalensis (Cherian, 1975), comb. nov., L. longicosta (Cherian, 1975), comb. nov., L. luteopilosa (Cherian, 1975), comb. nov., and Disciphus indica (Cherian, 1975), comb. nov.

The taxonomic history for all species of a species-rich genus of the Chloropidae (Diptera) is briefly presented for the first time, by the example of the genus Elachiptera Macquart, 1835. Here, all names of the species-group ever combined with the generic name Elachiptera are listed together with the references and the first page of their descriptions, their first transfer into the valid genus, their senior and junior synonyms and further important references to their taxonomical status. In addition, all names of the genus group that have ever been associated with these species names are listed together with their type species. Thirty new combinations are introduced in order to transfer species from Melanochaeta Bezzi, 1906 (a synonym of Oscinella Becker, 1909) to the valid genera Lasiochaeta Corti, 1909 and Gampsocera Schiner, 1862. The known zoogeographical distribution of each of the 81 valid Elachiptera species and 74 valid species in other genera is briefly summarized. Selected exemplary data on larval habitats of Elachiptera are discussed.

Two new species of the genus Chaetocladius are described, C. (s. str.) coppai sp. nov. as male adult and C. (s. str.) diai sp. nov. as male adult and pupa. The descriptions are based on the material collected at glacial alpine springs and small streams located in the Maritime French Alps and the Swiss Alps for C. coppai sp. nov., and the Mount Lebanon range for C. diai sp. nov. According to the characters of the adult males, C. coppai sp. nov. belongs to the laminatus-group, while C. diai sp. nov. is close to C. elegans Makarchenko et Makarchenko, 2001. The comments on the taxonomic position, ecology and geographical distribution of the new species are given.

The new records of five species of Limoniidae (Diptera) are given: Rhabdomastix beckeri (Lackschewitz, 1935) and Scleroprocta pentagonalis (Loew, 1873) are recorded for the first time from Russia; the first reliable record of Eloeophila mundata (Loew, 1871) from Russia is given; Hexatoma fuscipennis (Curtis, 1836) and H. nubeculosa nubeculosa (Burmeister, 1829) are recorded for the first time from NE European Russia. It is found that the larvae of four species, R. beckeri, S. pentagonalis, E. mundata and H. fuscipennis, in NE European Russia (Perm Territory and Udmurtia) are aquatic psammorheophilous forms inhabiting sandy sediments at the bottom of rivers in sites with strong current. Previously the larvae in these genera and in three of these species have been considered mostly as semiaquatic forms that develop in substrata near the water margin. Larval habitats of the four species in the study area are characterized. The photographs of diagnostic characters of adult males of these species are given.

A total of 38 morphometric characters of the round goby Neogobius melanostomus melanostomus (Pallas, 1814) were studied in its native range in the Sea of Azov. The aim was to assess joint effect of sexual dimorphism and size variability on overall variability within groups of samples (populations) using appropriate methods of traditional statistical analysis (one-dimensional and multivariate statistics). Sex and size-dependent variability was studied based on model samples of males and females of different size. Most of the studied morphometric characters of round goby from the Sea of Azov demonstrated statistically significant sex- and size-dependent in-group variability. The pattern of the variability suggests that, for a comparison of round goby from different sea regions and between populations, separate samples of males and females within the range 9–13 cm SL should be examined in order to minimise the effect of the size and sex factors. The approach of searching for the most informative size range could be useful not only for further studies of infraspecific variation but for comparisons between morphologically close gobiin species.

Svetlana N. Myartseva started her extensive study of Mexican Chalcidoidea in 1998 as a professor of the Universidad Autónoma de Tamaulipas in Ciudad Victoria, Mexico. From 2000 to 2016 she published four monographs, 15 book chapters and 91 journal articles on taxonomy, fauna and biology of Mexican Chalcidoidea. She described one new genus and 140 species belonging to five families: Aphelinidae (117 species in 10 genera), Encyrtidae (15 species in 6 genera), Eulophidae (5 species in 2 genera), Eupelmidae (1species) and Trichogrammatidae (1 species). The most valuable contribution by S.N. Myartseva was to the knowledge of the family Aphelinidae and its largest genus Encarsia Förster. As results of her investigations, the number of species in this genus in the Mexican fauna was increased from 30 in 2000 to 112 in 2016; 70 species were described by S.N. Myartseva as new. Currently, 14 genera and 214 species of Aphelinidae (1 genus and 117 species from 10 genera were described as new) are known to occur in Mexico which is almost three times more species than were known in 2000. A complete list of new taxa of Chalcidoidea described by S.N. Myartseva from Mexico and all her publications on Mexican Chalcidoidea are provided.