Taxonomy, annotated new records and a checklist of Mymaridae (Hymenoptera) of Finland, with description of a new species of Eustochus

A taxonomic account and an annotated checklist of the Finnish Mymaridae (Hymenoptera: Chalcidoidea) are given, comprising 85 named species in 19 genera. Among them 2 genera, Dicopus Enock, 1909 and Stethynium Enock, 1909, 1 subgenus, Anagrus (Paranagrus Perkins, 1905), and the following 25 species represent new records for Finland: Anagrus (Anagrus) avalae Soyka. 1956, A. (Anagrus) bakkendorfi Soyka, 1946, A. (Anagrus) ensifer Debauche, 1948, A. (Anagrus) nigriceps (Smits van Burgst, 1914), A. (Anagrus) obscurus Ffirster, 1861, A. (Anagrus) parvus Soyka, 1956,A. (Anagrus) subfuscus Foerster, 1847,A. (Paranagrus) optabilis (Perkins, 1905), Anaphes (Anaphes) stygius Debauche, 1948, Camptoptera magna Soyka, 1946, Cleruchus megatrichus Novicky. 1965, C. taktochno Triapitsyn. 2014, Cosmocomoidea oxypygus (Foerster, 1856), C. tremulae (Bakkendorf, 1934), Dicopus minutissimus Enock, 1909, D. moscovit Triapitsyn, 2015, Gonatocerus aegvptiacus Soyka, 1950, Lymaenon aureus (Girault, 1911), L. longior (Soyka, 1946), Polynemaflavipes Walker, 1846, P. fuscipes Haliday, 1833, P. pusilloides Debauche, 1948, P. valkenbutgense Soyka, 1931, P. vitripenne (Foerster, 1847), and Stethvnium triclavatum Enock. 1909. New distributional records and taxonomic notes on some genera and species are also provided. Caraphractus Walker, 1846, syn. nov. is synonymized with Eustochus Haliday, 1833 and treated as its subgenus, E. (Caraphractus), stat. revid., and its type species Caraphractus cinctus Walker, 1846 is transferred to Eustochus as Eustochus (Caraphractus) cinctus (Walker, 1846), comb. nov. Eustochus (Eustochus) koponeni Triapitsyn, sp. nov. is described from Finland and Germany. Lymaenon gracilentus (Hellen, 1974), stat. restit. is resurrected as a valid species from the previous synonymy with Lymaenon aureus and redescribed. The previously unknown male of Alaptus schmitzi Soyka, 1939 is described. Polynema depressicollis Hellen, 1974, syn. nov., is synonymized with Polynema (Doriclytus) vitripenne. Anagrus (Paranagrus) optabilis is newly recorded from the Canary Islands and Madeira, and Cleruchus megatrichus is for the first time reported from France.