At a time when nature conservation has become essential to ensure the long-term sustainability of our environment, it is widely acknowledged that conservation actions must be implemented within a solid taxonomic framework. In preparation for the upcoming update of the IUCN Red List, we here update the European checklist of the wild bees (sensu the IUCN geographical framework). The original checklist, published in 2014, was revised for the first time in 2017. In the present revision, we add one genus, four subgenera and 67 species recently described, 40 species newly recorded since the latest revision (including two species that are not native to Europe), 26 species overlooked in the previous European checklists and 63 published synonymies. We provide original records for eight species previously unknown to the continent and, as original taxonomic acts, we provide three new synonyms, we consider two names as nomina nuda, ten names as nomina dubia, three as species inquirenda, synonymize three species and exclude 40 species from the previous checklist. Around a hundred other taxonomic changes and clarifications are also included and discussed. The present work revises the total number of genera for IUCN Europe to 77 and the total number of species to 2,138. In addition to specifying the taxonomic changes necessary to update the forthcoming Red List of European bees, we discuss the sampling and taxonomic biases that characterise research on the European bee fauna and highlight the growing importance of range expansions and species invasions.

Pollinators play a crucial role in ecosystems globally, ensuring the seed production of most flowering plants. They are threatened by global changes and knowledge of their distribution at the national and continental levels is needed to implement efficient conservation actions, but this knowledge is still fragmented and/or difficult to access. As a step forward, we provide an updated list of around 3000 European bee and hoverfly species, reflecting their current distributional status at the national level (in the form of present, absent, regionally extinct, possibly extinct or non‐native). This work was attainable by incorporating both published and unpublished data, as well as knowledge from a large set of taxonomists and ecologists in both groups. After providing the first National species lists for bees and hoverflies for many countries, we examine the current distributional patterns of these species and designate the countries with highest levels of species richness. We also show that many species are recorded in a single European country, highlighting the importance of articulating European and national conservation strategies. Finally, we discuss how the data provided here can be combined with future trait and Red List data to implement research that will further advance pollinator conservation.

A first checklist of the Iranian Chrysididae is proposed. The list includes 184 species in 20 genera. Seventy species and genera Spinolia Dahlbom, 1854, Spintharina Semenov, 1892, Trichrysis Lichtenstein, 1876 are newly recorded from Iran. New combination is proposed for Chrysura laconiae (Arens, 2001), comb. nov. (from Chrysis) and Chrysura pyrogaster turca (Linsenmaier, 1997), comb. nov. (from Chrysis). New synonymy is proposed for Chrysura barbatula (Linsenmaier, 1968) = Chrysura barbatica Bohart, 1991, syn. nov. The status of Chrysis transcaspica Mocsáry, 1889 is resurrected. Historical data with the comments of current taxonomic position and the specific validity of some species are given.

An annotated checklist of the Chinese Chrysididae is provided. The list includes 188 species and subspecies in twenty three genera of five subfamilies. Four species are proposed as new combinations: Hedychridium cupreum asianum (Linsenmaier, 1997), Philoctetes deauratus (Mocsáry, 1914), Ph. mordvilkoi (Semenov-Tian-Shanskij, 1932), and Pseudomalus hypocritus (du Buysson, 1893). Two species are revalidated: Chrysis consobrina Mocsáry, 1889, and Philoctetes mongolicus (du Buysson, 1901). Historical data with comments on the current taxonomic position, and the pictures of sixty five types are also given.

A critical and annotated review of published records of the Chrysididae of the Nordic and Baltic countries and the Russian part of Fennoscandia is presented with some taxonomic and faunistic notes. A total of 73 species are listed from the region. Additionally, 17 species are deleted. Three species are recorded for the first time from Denmark, six species from Estonia, one from Finland, eleven from Latvia, four from Norway, one from Sweden and 15 from Russian Fennoscandia. Elampus foveatus and Chrysis pulcherrima are reported for the first time from the Nordic and Baltic countries. Lectotypes are designated for Hedychrum cupreum Dahlbom, 1845, Chrysis zetterstedti Dahlbom, 1845, Chrysis succincta var. chrysoprasina Trautmann, 1927, Chrysis succincta var. virideocincta Trautmann, 1927 and Chrysis succincta var. nordstromi Trautmann, 1927. Information and images of the holotypes of Hedychrum metallicum Dahlbom, 1854, Chrysis succincta var. westerlundi Trautmann, 1927 are given. Chrysis integra Dahlbom, 1829 is found to be a new synonym of Hedychridium ardens (Coquebert, 1801) and Chrysis scintillans Valkeila, 1971 a new synonym of Chrysis solida Haupt, 1957. Chrysis terminata Dahlbom, 1854 is reported for the first time as the valid name for C. ignita Form A sensu Linsenmaier, 1959.