@article {199, title = {Revision of the Exechia parva group (Diptera: Mycetophilidae)}, journal = {Biodiversity Data Journal}, volume = {9}, year = {2021}, month = {sep}, pages = {1{\textendash}122}, abstract = {

Exechia is a diverse genus of small fungus gnats, widespread in the Holarctic Region, while the fauna is largely unknown elsewhere, such as in the Afrotropical and Oriental Region. Members of Exechia can be arranged into several species groups, based on homologies in the male and female terminalia. The Exechia parva group is delimited, based on male terminalia possessing a pair of gonocoxal lobes on the apicoventral gonocoxal margin. Eight previously-described species can be placed in this group, of which six are from the Holarctic Region, while one is recorded each from the Oriental and the Afrotropical Regions.

The Exechia parva group was reviewed and found to include 33 species, of which 24 were described as new to science and six were re-described. Identification keys to 32 species for males and nine species for females are provided together with illustrations and photos of male and female terminalia. Species delimitations were based on morphological examination of 94 male and female specimens, as well as DNA barcodes obtained from 124 specimens. Molecular and morphological species delimitations were mostly congruent, except in two cases where two species were delimited within a single Barcode Index Number (BIN). We found that each species is only known from a single zoogeographical region and that several species complexes are largely congruent with zoogeographical divisions, indicating that intercontinental barriers may have a strong impact on the species diversity of the group.

}, keywords = {DNA barcodes, Exechia, fungus gnats, parva, repanda, taxonomy, _pdf}, issn = {1314-2828}, doi = {10.3897/BDJ.9.e67134}, url = {https://bdj.pensoft.net/article/67134/}, author = {Lindemann, Jon Peder and S{\o}li, Geir and Kj{\ae}randsen, Jostein} } @article {173, title = {Coelosynapha, a new genus of the subfamily Gnoristinae (Diptera: Mycetophilidae) with a circumpolar, Holarctic distribution}, journal = {Biodiversity Data Journal}, volume = {8}, year = {2020}, chapter = {e54834}, abstract = {

The subfamily Gnoristinae is one of the most diverse and taxonomically difficult subfamilies of Mycetophilidae, with new species and genera being described almost every year from various parts of the world. Through inventories of fungus gnats in the Nordic Region and Russia, a genus and species new to science was discovered, yet with links back to an illustration made by the late French entomologist Lo\ïc Matile in the 1980s. DNA barcoding aligned it with yet another species new to science, distributed across Canada and documented through The Barcode of Life Data System (BOLD) by Paul D. N. Hebert and colleagues at the BOLD team. The new Holarctic genus, Coelosynapha gen. n. is described, consisting of two new species, the Palaearctic Coelosynapha loici sp. n. and the Nearctic Coelosynapha heberti sp. n. DNA-barcodes assign the two new species to distinctly separated (8.27\% p-distance) Barcode Index Numbers (BINs) which are most closely aligned to unidentified species of Mycetophilidae from South Australia and Costa Rica on BOLD. The new genus shows morphological characteristics in between the two Holarctic genera Coelosia Winnertz, 1864 and Synapha Meigen, 1818 and further shows affinity to the southern continents genus Austrosynapha Tonnoir, 1929. The Palaearctic Coelosynapha loici sp. n., for which habitat requirements are best documented, is largely restricted to pristine, old-growth conifer (mostly spruce, Picea abies ssp. obovata) forests within the boreal vegetation zone, although it is also recorded from hummock tundra along the Anadyr River in Far East Russia.

}, keywords = {Coelosynapha, DNA barcoding, Gnoristinae, Holarctic distribution, Mycetophilidae, new genus, new species, old-growth conifer forests}, doi = {10.3897/BDJ.8.e54834}, url = {https://doi.org/10.3897/BDJ.8.e54834}, author = {Kj{\ae}randsen, Jostein and Polevoi, Alexei and Salmela, Jukka} }