Zootaxa 4927 (2): 151–196 ISSN 1175-5326 (print edition) https://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2021 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4927.2.1 http://zoobank.org/urn:lsid:zoobank.org:pub:942E128B-0A2C-4799-9A8A-B87A1A4FF627 Chaoborus flavicans Meigen (Diptera, Chaoboridae) is a complex of lake and pond dwelling species: a revision JUKKA SALMELA1,2*, OSKARI HÄRMÄ3 & DEREK J. TAYLOR4 1Regional Museum of Lapland, Pohjoisranta 4, 96200 Rovaniemi, Finland 2Arctic centre, University of Lapland, P.O. Box 122, 96101, Rovaniemi, Finland 3Forssa Museum of Natural History, Wahreninkatu 4, 30100 Forssa, Finland
[email protected]; https://orcid.org/0000-0002-1586-6320 4Department of Biological Sciences, University at Buffalo, Buffalo, NY, 14260, USA
[email protected]; https://orcid.org/0000-0002-2524-0559 *Corresponding author.
[email protected]; https://orcid.org/0000-0001-9462-9624 Abstract Chaoborus flavicans (Meigen) is a widespread and much studied lacustrine phantom midge. As larvae, these insects are important aquatic predators. Based on the available type material, morphology of immature stages and adults, their aquatic habitat, and DNA barcodes, C. flavicans is shown to be a composite of at least four species, with three of these named here. Chaoborus flavicans is primarily a lake-dwelling species with a Holarctic range. Chaoborus albipes (Johannsen, 1903 stat. rev.) and C. posio Salmela sp. n. are pond-dwelling Holarctic and north European species, respectively. The position of the larval subordinate mandibular tooth at the vertex of the second and fourth teeth is a synapomorphy of the Chaoborus flavicans species complex.