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Aprionus Kieffer, 1894 is one of the most species-rich genera of the fungivorous subfamily Micromyinae (family Cecidomyiidae, gall midges). Eighteen new species of this genus are described here from different parts of the Palearctic region based on morphological characters of male adults: Aprionus balduri sp. nov. (Norway, Sweden), A. bestlae sp. nov. (Sweden, Czech Republic), A. borri sp. nov. (Sweden), A. fontanus sp. nov. (Germany), A. friggae sp. nov. (Sweden), A. fujisanensis sp. nov. (Japan), A. hugini sp. nov. (Sweden, Germany), A. magnii sp. nov. (Sweden), A. montivagus sp. nov. (Germany, Russia), A. munini sp. nov. (Sweden, Germany, Hungary), A. odini sp. nov. (Sweden), A. ogawaensis sp. nov. (Japan), A. sifae sp. nov. (Sweden), A. sleipniri sp. nov. (Sweden), A. surtri sp. nov. (Sweden), A. thori sp. nov. (Sweden), A. tyri sp. nov. (Sweden), and A. ymiri sp. nov. (Sweden, Finland). These species are classified with the angulatus, halteratus and smirnovi groups, or remain unclassified within the genus Aprionus. The styloideus subgroup of the halteratus group is established for seven species (four described here as new) with generally similar male genitalic morphology. Aprionus paludosus Jaschhof & Mamaev, 1997 is revived from synonymy with A. styloideus Mamaev & Berest, 1990, and both species are redescribed.
Glemparon Jaschhof, 2013, a previously monotypic genus confined to Sweden, is shown here to be considerably richer in species, with most species found to occur in the Australasian region. Eighteen new species are described: G. tomelilla sp. nov. (from Sweden); G. aotearoa sp. nov., G. birhojohmi sp. nov., G. cervus sp. nov., G. didhami sp. nov, G. kaikoura sp. nov., G. nativitas sp. nov., G. orautahi sp. nov., G. otago sp. nov., G. pureora sp. nov., G. rakiura sp. nov., G. rotoiti sp. nov., G. rotoroa sp. nov., G. tewaipounamu sp. nov., G. waipapa sp. nov., G. waipoua sp. nov. (all from New Zealand); G. manuka sp. nov. and G. warra sp. nov. (both from Tasmania, Australia). Glemparon sagittifer Jaschhof, 2013 is redescribed. Genitalic illustrations are provided allowing for the effective identification of all the species known thus far. Morphological data obtained here are used for revising the generic definition. Dicerura Kieffer, 1898 is hypothesized as the sister group to Glemparon. The case of Glemparon is discussed as a perfect example of the fact that our collective ignorance of porricondyline diversity in most parts of the world is a major impediment to a better understanding of the European species.
Three new species of Monepidosis Mamaev, 1966, a Holarctic genus of Porricondylinae (Diptera, Cecidomyiidae), are described: M. heterocera sp. nov. from Sweden and Germany, M. scepteroides sp. nov. from Sweden, and M. shikokuensis sp. nov. from Japan. A new porricondyline genus, Antipodosis gen. nov., is introduced for eight new species from New Zealand, named A. australis gen. et sp. nov., A. elongata gen. et sp. nov., A. granvillensis gen. et sp. nov., A. pureora gen. et sp. nov., A. rakiura gen. et sp. nov., A. rotoiti gen. et sp. nov., A. rotoroa gen. et sp. nov., and A. waipapa gen. et sp. nov. Male genitalic morphology indicates that Monepidosis and Antipodosis gen. nov. are closely related, together forming the Monepidosis group of genera, which stands out from the other Porricondylini. Monepidosis spatulata Spungis, 2006, a species originally described from Latvia and Lithuania, is for the first time reported to occur in Sweden.
Fungivorous gall midges of the subfamilies Lestremiinae, Micromyinae, Winnertziinae and Porricondylinae were largely neglected in previous inventories of the Diptera faunas of the Czech and Slovak Republics. A taxonomic-faunistic study focusing on these subfamilies identified a total of 80 species, of which 49 are new records for the Czech Republic and 33 are new records for Slovakia. Species that have never before been found in central Europe are Aprionus dalarnensis Mamaev, 1998, A. oligodactylus Jaschhof, 2009, A. pigmentalis Mamaev, 1998, Asynapta inflata Spungis, 1988, Camptomyia gigantea Spungis, 1989, Cassidoides fulviventris (Mamaev, 1964), Claspettomyia hamata (Felt, 1907), Dendrepidosis longipennis (Spungis, 1981), Dicerura dispersa Jaschhof, 2013, Divellepidosis lutescens (Spungis, 1981), D. pallescens (Panelius, 1965), D. vulgata Jaschhof, 2013, Ekmanomyia svecica Jaschhof, 2013, Holoneurus ciliatus Kieffer, 1896, Monepidosis pectinatoides Jaschhof, 2013, Neocolpodia gukasiani (Mamaev, 1990), Neurolyga acuminata Jaschhof, 2009, Neurolyga interrupta Jaschhof, 2009, Parepidosis planistylata Jaschhof, 2013, Peromyia bidentata Berest, 1988, Porricondyla errabunda Mamaev, 2001, P. microgona Jaschhof, 2013, P. tetraschistica Mamaev, 1988, Schistoneurus irregularis Mamaev, 1964, Spungisomyia fenestrata Jaschhof, 2013, S. media (Spungis, 1981), Tetraneuromyia lamellata Spungis, 1987, T. lenticularis (Spungis, 1987), and Winnertzia parvispina Jaschhof, 2013. A new genus including a single new species of Porricondylini is described and named Glossostyles perspicua Jaschhof & Sikora gen. et sp. nov. on the basis of specimens collected in the Czech Republic and Sweden. Adult morphology suggests that Glossostyles gen. nov. is a close relative of Claspettomyia Grover, 1964.