Abstract
The immature stages of Chironomidae (non-biting midges) are important biotic components of the percolating filter beds of sewage works. Orthocladius (Eudactylocladius) fuscimanus (Kieffer) is recorded from a sewage works for the first time, is described in all stages and a neotype designated. Considerable taxonomic and nomenclatural confusion concerning the species and subgenus was resolved by recognition of holotypes of Dactylocladius fuscitarsis Kieffer, D. olivaceus Kieffer, Orthocladius indivisus Kieffer and Eudactylocladius vagans Thienemann, by designation of neotypes for Dactylocladius adauctus Kieffer, D. fontium Kieffer and Orthocladius hygropetricus Kieffer and selection of a lectotype for Eudactylocladius bidenticulatus Thienemann. Orthocladius hygropetricus, O. indivisus, O. bidenticulatus, Dactylocladius adauctus, D. fuscitarsis and D. fontium are all newly synonymized with O. fuscimanus, and Eudactylocladius vagans synonymised with Orthocladius (Eudactylocladius) olivaceus (Kieffer). The det...
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