A new species of the planthopper taxon Bennini (Hemiptera: Fulgoromorpha: Cixiidae) was discovered in the wide interstitial voids of a granitic blockfield in Vietnam. A key to the species of the Vietnam-endemic Bennini genus Sanghabenna is provided and Sanghabenna florenciana sp. nov. is described and illustrated. Molecular data including 18S in part and CO1 barcode sequences of the species, as well as for the first time a detailed description of nymphal morphology of a Bennini are provided. According to the ecological parameters of its habitat and its morphological configuration, Sanghabenna florenciana sp. nov. is classified as an exapted eutroglophile taxon.

Euxaldar jehucal Fennah, 1978 is redescribed. Euxaldar lenis sp. nov. is described from Southern Vietnam. Sexual dimorphism and asymmetry in male genitalia are recorded for the genus Euxaldar Fennah, 1978.

The new helconine genus Nipponocolpus Belokobylskij et Fujie, gen. nov. of the tribe Diospilini, with type species N. maetoi Belokobylskij et Fujie, sp. nov., from Japan (Honshu) is described and illustrated. The genus Baeacis Foerster, 1878 is restored from synonym with the genus Diospilus Haliday, 1933. Morphological characters used in Helconinae classification are discussed. A key for identification of the Holarctic genera of Diospilini is given.

This paper presents the karyotype and external morphology of larva, pupa and adult male of Stictochironomus sticticus (Fabricius, 1781) from Poland. The species of the genus Stictochironomus are generally identified on the basis of pupal and adult morphology. However, the species described in this paper has species-specific markers in the salivary gland chromosomes which allow identification at the larval stage. Karyological markers are evaluated for the Polish population in comparison with other European populations and Stictochironomus species.

Tephritis alamutensis sp. nov. collected on flowerheads of Cousinia sp. cf. umbrosa (Asteraceae: Cardueae) in northern Iran is described. It is similar to T. ochroptera S. Korneyev, 2013, and T. afrostriata S. Korneyev, 2013 in body size and wing pattern coloration (yellowish body, pale wing pattern, cell r₁ with two large spots and oviscape at least partly yellow), but differs from both species by the incised aculeus tip and setulose ventral side of vein R4 5, as well as details of the wing pattern. The new species is also compared with the superficially similar European species, T. vespertina (Loew, 1844). An improved key to species of Tephritis having the pale brown wing pattern is provided.

The monotypic genus Hancockitettix Storozhenko et Pushkar, gen. nov. (type species Hancockitettix humeratus Storozhenko et Pushkar, sp. nov.) from the Malay Peninsula is described. A new genus belongs to the subfamily Cladonotinae. It resembles the genera Hancockella Uvarov, 1940 from India and Austrohancockia Günther, 1938 from China, Taiwan, Japan and Vietnam in the general body appearance, in the large lobules on the upper and lower margins of the fore and mid femora, and in the relatively narrow scutellum, but differs from them by the presence of fully developed tegmen, hind wing and tegminal sinus, by the triangular plate-like projected shoulder of pronotum, and by the considerable distance between the most outstanding parts of shoulders which exceeds the pronotum lobe width (in other mentioned genera the hind wing and tegminal sinus are absent, the tegmen is absent or rudimentary, lateral side of shoulder is broadly rounded or obtusely angular, and the distance between shoulders is less than the pronotum lobe width).

Nine species of the genus Coenodomus (including one unnamed species) are recognized from China. Among them, four species are described as new to science: C. anacanthos sp. nov., C. pachycaulosus sp. nov., C. puniceus sp. nov. and C. stigma. sp. nov. Two species, C. fumosalis (Hampson, 1903) and C. rotundinidus Hampson, 1891 are reported in China for the first time. All adults and their genital structures are illustrated. A key to the Chinese species and an updated checklist of the genus are provided.

Cryptocephalus abdeldayemi sp. nov. is described from the South-West of the Kingdom of Saudi Arabia (Al-Baha province). The new species is similar to C. chikatunovi Lopatin, 2008 from United Arab Emirates and Oman, and C. ajeschae Schöller, 2006 from Yemen. All three species have modified prosternum forming a mouthparts basket. Cryptocephalus chikatunovi is also recorded for the first time from Oman.

A new species of the extinct genus Brochocoleus Hong, Brochocoleus zhiyuani sp. nov. is described based on two well preserved fossils embedded in the mid-Cretaceous amber originating from Myanmar. The species is deposit to B. caseyi Jarzembowski, Wang et Zheng, 2016 described from the same deposits but differs in having not an elongated head, long antennae and rounded prothorax.

A new species of the genus Dascillus Latreille, 1797, D. attenuatus sp. nov. is described from Guizhou province, China. Distributional data to this new species is provided.

The egg case and larvae of all three instars of the cascade beetle Tritonus complanatus Short, 2008 (Coleoptera: Hydrophilidae) are described based on specimens found co-occurring with adults and associated with them by comparing histone 3 nDNA sequences. The morphology of the larva is congruent with the phylogenetic position of Tritonus Mulsant, 1844 in the Paracymus-group of the Laccobiini, but also exhibits characters shared with larvae of Hydrobiusini, and some presumed adaptations to the hygropetric life style. The larva has open mesothoracic and abdominal spiracles situated on top of long spiracular tubes in the first instar, likely working as ‘spiracular snorkels’, and on low tubercles in later instars, along with a well-developed spiracular atrium. Similar spiracular morphology was found in the larva of the terrestrial laccobiine genus Tormus Sharp, 1884, and a brief examination of larvae of few other genera (Oocyclus Sharp, 1882, Hydrobius Leach, 1815) reveals that the peripneustic spiracular system (mesothoracic plus 8 abdominal functioning spiracles) may be more widespread in larval Hydrophilidae than currently believed.

Paradermestes jurassicus gen. et sp. nov., a new dermestid beetle is described based on a well-preserved impression fossil collected from the Middle Jurassic Jiulongshan Formation in Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China, making it the oldest fossil of the family. Based on its size, no visible ocellus and laterally reduced hind coxal plates Paradermestes is placed in subfamily Dermestinae and tribe Paradermestini, trib. nov.

The Neotropical mayfly genus Borinquena Traver, 1938 so far comprises three described extant species from the Caribbean basin. Furthermore, three fossil species from Dominican amber have been described in this genus. Based on a single male imago, Borinquena schawallfussi sp. nov. is described in this contribution as the fourth fossil species of Borinquena from Miocene Dominican amber. The new species clearly differs from all other fossil and recent representatives of the genus Borinquena in forewing colouration and venation, hind wing shape and venation, and in the shape of penis lobes and their ventral spines.

A monogeneric elateroid family Iberobaeniidae is endemic to the Iberian Peninsula. Two species of Iberobaenia Bocak, Kundrata, Andújar & Vogler, 2016 were formally described from Jaén and Murcia, and unidentified larvae were reported from Sierra de Cabra in Córdoba. Recent collecting effort yielded males conspecific with the earlier reported larvae and we describe these males as I. andujari sp. nov. We evaluate the genetic and morphological differentiation within Iberobaenia and illustrate male genitalia which provide principal morphological diagnostic characters. The new species differs in the shape of the prothorax and male genitalia. Moreover, its status is supported by the high genetic divergence of the cytochrome c oxidase subunit I mtDNA fragment. We provide detailed data on the distribution and ecology of Iberobaenia and the identification key to adult males.

Gastrotricha is a cosmopolitan phylum of aquatic and semi-terrestrial invertebrates comprising over 820 described species. Virtually no taxonomic or faunistic data exist on freshwater Gastrotricha of the Arctic. So far, 10 studies have recorded Gastrotricha from the entire area of the Svalbard Archipelago; only in two were gastrotrichs determined to the genus and species levels. The remaining studies only reported the presence of Gastrotricha as a phylum. In this article, I present the results of research on freshwater Gastrotricha from the area of fjord Isfjorden (Spitsbergen, Arctic). The collected material contained representatives of 8 species, 2 subgenera of Chaetonotus namely Chaetonotus (Chaetonotus) Erhenberg, 1830 and Chaetonotus (Hystricochaetonotus) Schwank, 1990, two genera namely Chaetonotus Erhenberg, 1830 and Bifidochaetus Kolicka et Kisielewski, 2016, both belonging to the family Chaetonotidae Gosse, 1864 (sensu Leasi and Todaro, 2008). I describe 3 new species from the Chaetonotidae: Chaetonotus (Chaetonotus) jaceki sp. nov., C. (C.) gelidus sp. nov., and C. (C.) svalbardi sp. nov., together with data on the range, frequency and abundance of all noted species. Furthermore, a record abundance of Gastrotricha was noted, amounting to more than one thousand specimens per 1 cm³ of bottom sediment.