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Over the past decade, the prevalence of mass outbreaks involving non-native insects has sparked concerns about their potential negative impact on human inhabited areas and local environments. Duda, 1933 (Diptera, Bibionidae) was recently recognized as an invasive pest in South Korea, causing public nuisance through mass outbreaks in the Seoul Metropolitan Area during early summer. In this study, we present the first complete mitochondrial genome of , generated from the PacBio HiFi long-read sequencing data. Notably, the length of the circular genome is found to be larger than any annotated reference sequences of mitochondrial genomes for the infraorder Bibionomorpha, which is attributable to an unusually long A+T rich control region. We conducted a phylogenetic analysis of Bibionomorpha, focusing specifically on the family Bibionidae, using nearly all available mitochondrial genome data to elucidate relationships among genera within Bibionidae. Our phylogeny of Bibionomorpha recovered a strong monophyly of the family Bibionidae and its three subfamilies: Bibioninae ( + ), Hesperininae ( + ), and Pleciinae ( ), corroborating the recently proposed taxonomic classification system of Bibionidae. Furthermore, we discuss evolutionary trends within Bibionidae based on our well-supported higher relationships of the superfamily Bibionoidea.

We present records of 103 fly species from six families of Bibionomorpha (namely: Anisopodidae, Ditomyiidae, Bolitophilidae, Diadocidiidae, Keroplatidae, and Mycetophilidae) collected by a single Malaise trap in an Eastern Slovakia locality during the vegetation period in 2023. Data on five species, viz., ( ) (Meigen, 1818), Meigen, 1818, Edwards, 1925, Lundstrom, 1909, and Edwards, 1925 (all Mycetophilidae) represent the first records for the fauna of Slovakia, and habitus photographs of these species have been provided. A very rare Central European species – Matile, 1978 – has also been recorded and photographed.

The phylogeny of the insect infraorder Bibionomorpha (Diptera) is reconstructed based on the combined analysis of three nuclear (18S, 28S, CAD) and three mitochondrial (12S, 16S, COI) gene markers. All the analyses strongly support the monophyly of Bibionomorpha in both the narrow ( sensu stricto ) and the broader ( sensu lato ) concepts. The major lineages of Bibionomorpha sensu lato (Sciaroidea, Bibionoidea, Anisopodoidea, and Scatopsoidea) and most of the included families are supported as monophyletic groups. Axymyiidae was not found to be part of Bibionomorpha nor was it found to be its sister group. Bibionidae was paraphyletic with respect to Hesperinidae and Keroplatidae was paraphyletic with respect to Lygistorrhinidae. The included Sciaroidea incertae sedis (except Ohakunea Edwards) were found to belong to one clade, but the relationships within this group and its position within Sciaroidea require further study.

In this contribution, we present the first records of species from the families Cecidomyiidae, Keroplatidae, Mycetophilidae, and Sciaridae from Slovakia. A total of 45 species were identified, of which 44 species are new to Slovakia—29 in Cecidomyiidae, 3 in Keroplatidae, 8 in Mycetophilidae, and 4 in Sciaridae. New records for central Europe are as follows, Mamaev, 1998, (Mamaev, 1964), Mamaev, 1990, Panelius, 1965, Jaschhof & Jaschhof 2019, Jaschhof, 2013, Jaschhof & Jaschhof, 2019, (Felt, 1913), (Walker, 1856), Mamaev, 1966, Jaschhof, 2013, Jaschhof & Jaschhof 2019, (Spungis, 1987), and Zaitzev, 1982.

We summarized the known data on the distribution of Penthetria funebris Meigen, 1804 in Romania, based on old and two new records. We illustrate the male habitus, brachypterous wing, head and terminalia.

Saproxylic insects of the infraorders Bibionomorpha and Tipulomorpha (Diptera) are ecologically important components of forest ecosystems, associated with dead wood and contributing to nutrient cycling and food webs. Despite their diversity, the influence of climatic variables on saproxylic nematoceran communities remains poorly understood. This study examined the effects of precipitation, air temperature, and relative humidity on the abundance, species richness, and diversity of saproxylic nematoceran flies in three Lithuanian nature reserves from 2016 to 2020. In total, 793 specimens representing 10 families were collected using trunk-emergence traps. Statistical models showed that precipitation was significantly positively associated with species richness, total abundance, and Shannon’s diversity, whereas temperature and humidity were excluded as non-significant predictors. These results highlight precipitation as a key environmental driver shaping saproxylic fly assemblages and suggest potential sensitivity of these communities to reduced moisture availability under future climate change scenarios.

Over the past decade, the prevalence of mass outbreaks involving non-native insects has sparked concerns about their potential negative impact on human inhabited areas and local environments. Plecia longiforceps Duda, 1933 (Diptera, Bibionidae) was recently recognized as an invasive pest in South Korea, causing public nuisance through mass outbreaks in the Seoul Metropolitan Area during early summer. In this study, we present the first complete mitochondrial genome of Plecia longiforceps , generated from the PacBio HiFi long-read sequencing data. Notably, the length of the circular genome is found to be larger than any annotated reference sequences of mitochondrial genomes for the infraorder Bibionomorpha, which is attributable to an unusually long A+T rich control region. We conducted a phylogenetic analysis of Bibionomorpha, focusing specifically on the family Bibionidae, using nearly all available mitochondrial genome data to elucidate relationships among genera within Bibionidae. Our phylogeny of Bibionomorpha recovered a strong monophyly of the family Bibionidae and its three subfamilies: Bibioninae ( Bibio + Dilophus ), Hesperininae ( Hesperinus + Penthetria ), and Pleciinae ( Plecia ), corroborating the recently proposed taxonomic classification system of Bibionidae. Furthermore, we discuss evolutionary trends within Bibionidae based on our well-supported higher relationships of the superfamily Bibionoidea.

A new extant genus of Keroplatidae (Diptera: Bibionomorpha), Davimacrocera gen. nov., is described in this paper, which includes two new species, Davimacrocera davidi sp. nov. (Brunei, type species of the genus) and D. taiwanensis sp. nov. (Taiwan, China). Its relationships to other extant genera and possible phylogenetic position are briefly discussed, including a comparison with the fossil genus Burmacrocera Cockerell, 1917 from the mid-Cretaceous amber of Myanmar. The identity of Burmacrocera remains unclear, pending further studies of Keroplatidae in Burmese amber.

Geoffroy, 1762 is a species-rich genus within the family Bibionidae. In this study, we present the complete mitochondrial genome of Yang and Luo 1988 for the first time. Complete mitochondrial genome of is 15,496 bp in length, comprising 13 protein-coding genes (PCGs), 22 tRNA genes, two rRNA genes, and a control region. The nucleotide composition of mitochondrial genome of was 40.55% of A, 39.02% of T, 8.37% of G, and 12.05% of C. Based on the sequencing and annotating results, we conducted a preliminary phylogenetic analysis of Bibionomorpha. Our findings support the monophyly of both family Bibionidae and genus , with the family Bibionidae identified as the sister group to Sciaridae and Mycetophilidae. This study encompasses all reliable annotated mitochondrial genome data for Bibionidae and analyzed the higher-level phylogenetic relationships within the Bibionomorpha from the perspective of mitochondrial genome data.

The genus Chalastonepsia Søli, 1996 was erected for the species Chalastonepsia orientalis Søli, 1996 from Pahang, Peninsular Malaysia. The species C. hokkaidensis Kallweit, 1998 was described from Hokkaido, Japan. Ševčík and Hippa (2010) described two additional species of Chalastonepsia : C. nigricoxa Ševčík & Hippa, 2010 from Sumatra and Peninsular Malaysia and C. montana Ševčík & Hippa, 2010 from N.W. Thailand. A new Oriental species is described in the genus Chalastonepsia of the subfamily Gnoristinae – Chalastonepsia vumanhi Kazandzhieva sp. nov. from a single locality in Tam Dao National Park in northern Vietnam. The new species is closely related to C. hokkaidensis Kallweit, 1998, but differs from it by the number of long anterior projections on flagellomeres (1–9), the shape and size of T9, details on the gonostyli and their appendages. An identification key to the extant species of Chalastonepsia is provided. The taxonomy of the genus Chalastonepsia is shortly discussed in relation to the distinct morphology of the type species C. orientalis Søli, 1996.