Bovichtus veneris Sauvage, 1879 is a poorly studied species endemic to St Paul Island in the Indian Ocean. External morphology, teeth, axial skeleton and seismosensory system of three type specimens from the Muséum national d’histoire naturelle in Paris and one specimen from the collection of the Zoological Institute of the Russian Academy of Sciences, St Petersburg, were studied. A scheme of the seismosensory system of B. veneris is given. The investigated characters of B. veneris are compared with those of other species of the genus Bovichtus Valenciennes, 1832. The following diagnostic characters of B. veneris are established: snout length is less than the diameter of the eye and less than 25% of head length; the first predorsal distance is 1.2–1.5 times the interpelvic distance; caudal peduncle is 11.0–11.4%, opercular spine is 14.4–17.8% of standard length; outer teeth on the upper jaw are slightly enlarged; coloration is monotonous, without pronounced spots and saddles.

Paralecithodendrium ilei (Zdzitowiecki, 1969) is a rare parasite of European vespertilionid bats. Identification of this digenean species is difficult due to its high morphological similarity to closely related species. Specimens of P. ilei from the small intestine of the northern bat (Eptesicus nilssonii Schreber, 1774) inhabiting the Zhiguli State Nature Reserve (European Russia) were examined. The aim of this study was to analyse new material on P. ilei using both morphological and molecular phylogenetic approaches. Here, we provide a complete redescription of P. ilei from bats in European Russia, including the first molecular phylogenetic data based on 28S rRNA and cox1 mtDNA sequences. The results obtained confirm that this digenean species is distinct.

The genus Diphora Förster, 1856 is revised in the circumscription of two previously known species, D. westwoodii Förster, 1856 and D. nearctica Whittaker, 1931. Two species are described as new to science: D. belytoides sp. nov., which has been found in Norway and the Murmansk Province of Russia, and D. claviscapus sp. nov., which originates from the Republic of Karelia and the Chelyabinsk Province of Russia. An identification key for three Palaearctic species of Diphora is presented. New distribution data and illustrations are provided for all Palaearctic species of the genus. Diphora nearctica Whittaker, 1931 is confirmed as a distinct species, and its lectotype (female) is designated. The diagnoses of the genus and species are clarified.

A new species, Antonina kazasae sp. nov. (Pseudococcidae), is described and illustrated based on specimens collected in southern Vietnam (Cat Tien National Park). Additionally, fourteen other species from the families Coccidae, Margarodidae, and Pseudococcidae are recorded for the first time from various countries of Indochina (Myanmar, Thailand, Laos, and Vietnam).

New data on the morphology, distribution and host plants of three species from the Terellia virens group are provided. Terellia freidbergi Korneyev, 2013 and T. ivannikovi Korneyev et Evstigneev, 2013 are redescribed based on fresh specimens having the body shape and colour characteristic of living flies. Terellia zerovae Korneyev, 1985 is recorded for the first time from Russia; T. ivannikovi, previously known from the Samara Province of Russia, is recorded for the first time from Armenia and from the Saratov and Ul’yanovsk provinces of Russia. Centaurea takhtajanii Gabrieljan et Tonjan is recorded for the first time as a host plant of T. ivannikovi. In Armenia, the larvae of T. freidbergi develop in capitula of C. kotschyi persica (Boiss.) Greuter, C. (Chartolepis) sp., C. polypodiifolia Boiss, C. daralagoezica (Fomin) Greuter and C. spectabilis (Fisch. et C.A. Mey) Sch. Bip.; all these taxa are recorded for the first time as host plants of T. freidbergi. A key to identification of seven species of the T. virens group occurring in Armenia and Russia, is provided.

Five new species of plume moths (Lepidoptera: Pterophoridae) are described from Ecuador: Platyptilia azuayensis sp. nov., Hellinsia juliae sp. nov., H. razboinikovi sp. nov., H. muratovi sp. nov., and H. elini sp. nov. Two species of Pterophoridae, Quadriptilia obscurodactyla Gielis, 1994 and Stenoptilodes brevipennis (Zeller, 1874), are recorded from Ecuador for the first time.

Two species of Pauropoda, Allopauropus danicus (Hansen, 1902) and Decapauropus gracilis (Hansen, 1902), are recorded from Russia (Syktyvkar, Komi Republic) for the first time. The morphological characters and habitat of these species are briefly described. The COI sequences of mitochondrial DNA of D. gracilis are obtained and analysed for the first time. The previous records of Pauropoda in Russia, with identifications to species and genera, are briefly reviewed.

Two new species of Cossidae are described, Panau lourensi sp. nov. from the Philippines and P. tanimbari sp. nov. from the island of Tanimbar in Indonesia. The new species are close to the poorly studied species P. variegatum (Roepke, 1957) from the island of Sulawesi in Indonesia. The male genitalia of the latter species are redescribed.

The genus Greeffiella Cobb, 1922 includes twelve species inhabiting all oceans of the world. Updated brief and illustrated diagnoses, an identification key and data on the geographical and bathymetrical distribution of all Greeffiella species are given. Two new species are described and illustrated: G. japonica sp. nov. from the Sea of Japan and G. pontica sp. nov. from the Black Sea. The genus is recorded from the Sea of Japan for the first time, and G. japonica sp. nov. completes the list of the free-living nematode species inhabiting the shelf of the Far Eastern seas of Russia. This species is characterised by 70 annules dorsally and 62 ones ventrally, the ocelli located on the annules 19 and 29, somatic setae 11‒25 μm long, six pairs of subdorsal tubular setae on the body, the vulva surrounded by dense fine hair-like setae, located between the annulus 37 and 38, the tubular anus, and the terminal tube 10 μm long. Greeffiella pontica sp. nov. mentioned by the authors in 2021 as Greeffiella sp. was collected in the northwestern shelf of Crimea (the Black Sea) at a depth of 56 m and is characterised by the following characters: 67‒70 annules dorsally and 67‒68 ones ventrally, the absence of ocelli, somatic setae 12‒42 μm long, seven pairs of subdorsal tubular setae on the body, the vulva surrounded by short sparse setae, not visible anus, and the presence of three thin terminal tubes 13 μm long.

The genus Parascleroderma Kieffer, 1904 belonging to the subfamily Pristocerinae is recorded from Russia for the first time. Two new species of this genus are described and illustrated from males: P. astrakhanicum sp. nov. from the Astrakhan Province and P. austrouralicum sp. nov. from the Orenburg Province. A key for both Russian species is provided. Morphological differences of the pristocerine genera Parascleroderma and Foenobethylus Kieffer, 1913 are discussed.