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[Northern species of Onychiurus Gervais, 1841, subgenus Archaphorura Bagnall, 1949 (Collembola: Onychiuridae), Ultrastructure of larval ventromental plates of European and North American representatives of Chironomus Meigen (subgenus Chaetolabis Townes) (Diptera: Chironomidae)]

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[The morphology of larval ventromentral plates of two taxa in the Chaetolabis subgenus of Chironomus Meigen, C. macani Freeman and C. ochreatus Townes, has been studied by light and scanning electron microscopy. The plates of these taxa are shown to differ in a number of ultrastructural characters, but still share features in common with representatives of other Chironomus subgenera. Taxonomic implications of these findings are discussed., Samples from Scandinavia, Svalbard, Canada, Alaska, and NE. Siberia have been examined, and the following species are described or commented: absoloni (Börner, 1901), groenlandicus (Tullberg, 1876), schoetti (Lie-Pettersen, 1896), ursi Fjellberg, 1984, aborigensis sp. n. (NE. Siberia), alnus sp. n. (NE. Siberia), interruptus sp. n. (NE. Siberia), nataliae sp. n. (NE. Siberia), nudus sp. n. (Alaska, Yukon), pingicolus sp. n. (Alaska), and reversus sp. n. (Alaska, Yukon). An identification key is given.]


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