Abstract
Isotoma notabilis Schäffer, I. agrelli Delamare and I. ekmani nom. nov. are easily separable by differences in the maxillary lamellae. I. ekmani is reported from Arctic Canada, Greenland and alpine habitats in Sweden and Norway. I. agrelli has been found in France and Norway. The distribution of I. notabilis is cosmopolitan. Isotoma notabilis Schäffer, I. agrelli Delamare and I. ekmani nom. nov. are easily separable by differences in the maxillary lamellae. I. ekmani is reported from Arctic Canada, Greenland and alpine habitats in Sweden and Norway. I. agrelli has been found in France and Norway. The distribution of I. notabilis is cosmopolitan.

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