In this paper, Macrobiotus naskreckii sp. nov., a new species of the hufelandi group from the Gorongosa National Park in Mozambique, is described. The analysis have revealed that M. naskreckii sp. nov. is most similar to M. kristenseni, M. ramoli and M. serratus. The new species differs from M. kristenseni mainly through a different shape of egg processes and clearly dentate lunules IV; from M. ramoli mainly by smaller eggs and a smaller number of egg processes on the circumference; from M. serratus mainly by the absence of the reticulation between the egg processes. This is a third record of tardigrades from Mozambique and apart of the new species reported here, three other taxa from Gorongosa National Park are provided: Minibiotus cf. intermedius, Minibiotus sp. and Paramacrobiotus cf. richtersi.

This article provides new morphological data about Mesocriconema involutum (Loof, 1987) Loof, 1989, a very rare European nematode species. This is the first report on its occurrence in Poland and the third record in Europe. Specimens of M. involutum described in this article were collected from the rhizosphere of grass on the bank of Lake Kielno (northern part of Poland). The research allowed to determine the presence of two projections on the anterior vulval lip, which previously had not been described for this species. A detailed description of the tail's terminal annulus is also given.

Troporhysipolis gen. nov. with four included species is described and illustrated. The type species, Clinocentrus antefurcalis Granger, 1949, is Afrotropical with unknown biology. We additionally recognise three new species from eastern lowland of Papua New Guinea, T. brenthiaphagus sp. nov., T. markshawi sp. nov. and T. molecularis sp. nov., all three of which were reared from leaf-rolling larvae of the family Choreutidae (Lepidoptera). The genus can be distinguished by the combination of fore wing vein cu-a (nervulus) being antefurcal and the second subdiscal (brachial) cell subparallel-sided, widened and formed of mainly thickened veins. The new genus is tentatively placed in the Rhysipolinae based on the arrangement of the occipital and hypostomal carinae, and partly on molecular phylogenetic analysis using the barcoding cytochrome oxidase 1 gene fragment and the D2 variable region of nuclear 28S rDNA. T. molecularis sp. nov. hardly differs from T. brenthiaphagus sp. nov. morphologically and is distinguished primarily based on its barcoding sequence data.

An annotated review of the Mesoveliidae (Hemiptera: Heteroptera: Gerromorpha) of the south-east European countries is provided. Mesovelia thermalis Horváth, 1915 is recorded for the first time from Romania outside of its type locality and for the first time from Bulgaria, Serbia, and Croatia. Therefore, its European geographical range is two times larger than previously known. Mesovelia vittigera Horváth, 1895 is excluded from the faunas of Romania and Moldova based on proven or suspected misidentifications and new information is provided about the distribution of M. furcata Mulsant et Rey, 1852. We analysed the phylogenetic relationships of M. thermalis within the genus and further examined additional south-east European individuals of M. vittigera and M. furcata. The results revealed that M. thermalis is a possible sister species to M. furcata, and that the south-eastern individuals of both M. vittigera and M. furcata are closely related to their conspecifics. Molecular dating based on fossil calibration indicated that the crown age of Mesovelia Mulsant et Rey, 1852 is ca. 22.8 Myr and the last common ancestor of M. thermalis and M. furcata lived ca. 4.7 Myr ago. Finally, an illustrated identification key to the European species of Mesovelia is provided.

A new genus and species Panegu linnavuorii gen. et sp. nov. are described and illustrated. The species is described from a single male specimen. The genus is placed as incertae sedis in the Lophopidae.

All scientific names of the southern African subtribe Eurynotina (Tenebrionidae) are catalogued. Sixteen genera containing 95 species and subspecies are listed. Data concerning primary and secondary types is provided. Schyzoschelus dumosicola var. diversipenis Koch, 1954, is recognized as an independent species. Lectotype for Eurynotus (Solenopistoma) denticosta Mulsant & Rey, 1854 is designated to fix the taxonomic status of this species. Based on the newly acquired and previously published data the diversity patterns of Eurynotina are analyzed. The highest diversity of species was reported from the Lowland and Montane fynbos and renosterveld ecoregions in the surroundings of Cape Peninsula. Distribution of the species is illustrated and listed in a CSV format. A revised key to the genera and subgenera of Eurynotina is provided.

A new species Blaps kasatkini sp. nov. is described from Western Iran (Kermanshah Province). The species belongs to the 6th group of the 2nd section sensu Seidlitz and most similar to Transcaucasian species Blaps araxicola Seidlitz, 1893 and Blaps pudica Ballion, 1888 from which it differs by the structure of temples, sculpture of prosternum, presence of hair brush between male abdominal ventrites 1 and 2 (the difference only from B. pudica), glabrous abdominal ventrites (the difference only from B. araxicola), structure of ovipositor, female genital tubes and presence of elytral mucron in female. New material of the little known species in the 6th group of the 2nd section sensu Seidlitz Blaps pudica, B. araxicola and Iranian species B. glazunovi Semenov Tian-Shansky et Bogatchev, 1936 is given. Blaps pudica is recorded for Armenia for the first time. Lectotype of B. glazunovi is designated.

46 new species of Chonocephalus are described. A key to males and a partial key to the females of the Oriental Region species are provided.

Multivariate statistical analyses of six quantitative characteristics revealed conspicuous variation within heteromorphic males of Dermatophagoides farinae (Acari, Pyroglyphidae) collected from house dust samples and from laboratory populations. Cluster analysis, principal coordinate analysis, analysis of variance and discriminant analysis revealed the presence of three heteromorphic forms and proved the taxonomic usefulness of quantitative characteristics such as length and width of idiosoma, length of gnathosoma, width of femur I and length of sternum.

Calyptostoma katyae sp. nov., the first named fossil species of Calyptostomatidae, is described based on a larva from the Eocene (ca. 44–50 Ma) Baltic amber. The syninclusion, a member of Limoniidae found with the newly described species, confirms the host-parasite associations known for the extant members of the family.