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The Neotropical social wasp genus Chartergus is reviewed and comparative diagnoses, images of type material, and an updated identification key for species are presented. To investigate the phylogenetic relationships within the genus, we used a combined dataset of morphological characters, nest architecture traits, and molecular data. The results revealed the following relationships among the Chartergus species: (C. globiventris + (C. artifex + C. metanotalis)).

Further information on the distribution of Aporia procris Leech, 1890 is provided. The population of A. procris from the upper Dadu River, W. Sichuan, previously recognized as ssp. yaozhui Huang, 2021, is treated as a new subspecies, viz., A. p. huangsiyaoi ssp. nov., based upon evidence from external features, with its genital and molecular characters given.

The life cycle of Cerroneuroterus minutulus (Giraud, 1859), a species previously known only from its asexual generation, is closed. Our study demonstrates that C. minutulus exhibits the heterogony typical of Cynipini species, with alternating sexual and asexual generations. The identity of the sexual generation is demonstrated by laboratory experiments and confirmed by molecular data, with Cerroneuroterus aggregatus (Wachtl, 1880) determined to be the sexual generation, and junior synonym, of Cerroneuroterus minutulus (Giraud, 1859). Illustrations and diagnoses for adults and galls, observations on biology and distribution information are provided as is a detailed redescription of the sexual generation of C. minutulus.

Two new macropsine species, Celopsis yaeyamana sp. nov. and Pediopsoides (Glaphyropsis) aurantescens subgen. & sp. nov. are described and illustrated from the Ryukyu Islands of Japan. Four Celopsis species, C. membrana (Zhang), C. montaninversa (Yang & Zhang), C. trifurcata (Li, Dai & Li) and C. rhombica (Li, Dai & Li) are transferred to the new subgenus Glaphyropsis.

The Darwin wasp genus Chirotica Frster, 1869 (Hymenoptera: Ichneumonidae, Phygadeuontinae) is poorly represented in Brazilian entomological collections, with only three previously described species. Herein, four new species are described and illustrated: C. juquia sp. nov., C. maraca sp. nov., C. mariua sp. nov. and C. nigra sp. nov.. Four other species are recorded for the first time for Brazil: Chirotica brevilabris Townes, 1983, C. pothina (Marshall, 1982), C. bruchii (Brthes, 1904) and C. stangei Townes, 1983. New morphological characters, comparative diagnoses, distribution maps and an illustrated key to the Brazilian species are also provided.

New species and new records of Palaearctic Campopleginae (Hymenoptera: Ichneumonidae) are reported in this paper: Porizon dahaka Vas, sp. nov. is described from Iran, with a complementary modification to the identification key of the genus; seven Western Palaearctic species, namely Bathyplectes rufigaster Horstmann, Casinaria paramorionella Riedel, Diadegma mediterraneum (Constantineanu), Diadegma neomajale Horstmann, Diadegma tamariscator (Aubert), Eriborus obscuripes Horstmann, and Hyposoter fitchii (Bridgman) are reported for the first time from the Eastern Palaearctic region (Iran); four species already known from the Eastern Palaearctic region, namely Diadegma aculeatum (Bridgman), Diadegma elegans Dbar, Dusona stragifex (Frster), and Meloboris pektusana Vas, are reported for the first time from Iran, the latter with the complementary description of the hitherto unknown male. Additionally, further data are provided on the distribution of Lemophagus eburnipes Vas, a species recently described from Iran.

A new species belonging to the ophiuroid genus Ophiomyxa is described from the Mallorca Channel seamount, in the western Mediterranean Sea. It can be distinguished from other Ophiomyxa species by the lack of interradial marginal plates, three arm spines, the presence of two thin, transparent and completely perforated dorsal arm plates on each arm segment, the separate heptagonal ventral arm plates, the disk integument full of transparent rounded scales with scattered perforated ossicles, and a characteristic coloration of the disk, which in the living specimen is brown with abundant scattered bright white spots. Molecular analyses based on cytochrome c Oxidase subunit I (DNA barcode) clearly support the assignment of the new species to Ophiomyxa. This discovery highlights the importance of the Mallorca Channel seamounts for the Mediterranean biodiversity conservation, as they seem to provide a suitable habitat for several invertebrate species, including recent descriptions of species and new Mediterranean records, which apparently have not established permanent populations along the closest continental margin.

As part of a study on the biodiversity of Diptera of south-western Saudi Arabia, a survey of the Diptera fauna of Jazan, Asir and Najran at 10 sites was performed between 20122015 mainly using Malaise traps, sweep nets and baited traps. A total of 21 species of Sarcophagidae are recorded and documented with photographs, seven of which represent new country records for Saudi Arabia. Including species with a reliable previous record from Saudi Arabia, the total number of species of Sarcophagidae known from Saudi Arabia now stands at 51. All species of Sarcophagidae recorded from Saudi Arabia are listed, including distributions and the source where species were first recorded. Material studied as part of the project resulted in 16 new country records for other countries. Alusomyia Villeneuve, 1933 is here synonymized with Hoplacephala Macquart, 1834, syn. nov., argued from the presence of four proclinate orbital bristles, the row of strong parafacial setae close to the anteroventral eye-margin, the large gena and the robust habitus compared to most other miltogrammines. The generic synonomy requires the new combinations Hoplacephala transfuga (Villeneuve, 1933), comb. nov. and Hoplacephala turana (Rohdendorf, 1975), comb. nov. Sarcophaga surcoufi Villeneuve, 1913 is synonymized with Engelisca adhamae Lehrer & Abou-Zied, 2008, syn. nov. An appendix authored by Dr J.C. Deeming contains the description of Sarcophaga dawahi Deeming, sp. nov.

The fastidiosissimus species-group of Stenodynerus de Saussure, 1863 is revised in Western Europe and North Africa, combining morphological data and DNA barcoding. Six species are recognized: S. difficilis (Morawitz, 1867) stat. resurr. (= S. fastidiosissimus auct.), S. fastidiosissimus (de Saussure, 1855), S. laborans (Costa, 1882) stat. resurr., S. montanus Selis, sp. nov., S. muelleri (Dusmet, 1917) (= Stenodynerus gusenleitneri Giordani Soika, 1986 syn. nov.), and S. rufescens Giordani Soika, 1977 stat. nov. Lectotypes are designated for Odynerus fastidiosissimus de Saussure, 1855 and Odynerus insularis Andr, 1883 non Smith, 1859. A key for the identification of members of this species-group is provided. DNA barcodes are published for every species, representing the first available sequences for the fastidiosissimus species-group.

The gryllacridid genus Woznessenskia Gorochov, 2002 comprises 13 extant species from Asia, with 8 species reported from China and 5 species reported from Vietnam. A new species from Xizang, China, Woznessenskia lianhua sp. nov., is reported in this paper.