Taxonomy of Tanytarsus lapponicus Lindeberg, 1970, a species with larval mandible of ‘lugens-type’ (Diptera: Chironomidae)

Associated larvae and pupae of Tanytarsus lapponicus Lindeberg, 1970 are described for the first time, and the male adult is redescribed. The species is morphologically most similar to Tanytarsus fennicus Lindeberg, 1970 and the adult male fits the diagnosis for the relatively heterogenous norvegicus species group. The larval mandible, however, shows affinities with the lugens species group, and could incorrectly be treated as such in subfossil material. T. lapponicus is recorded from northern Fennoscandia and Canada. In the Killarney Provincial Park, Ontario, the species is so far found to inhabit lakes within a pH range from 5.8 to 7.7, pointing at a promising indicator species of non-acid conditions