A review of theAgabus affinisgroup (Coleoptera: Dytiscidae), with the description of a new species from Siberia and a proposed phylogeny

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Abstract
Agabus yakutiaesp.n., from Siberia, is placed in theA.affinis(Paykull) species‐group, characterized by the unique structure of the male stridulatory organ formed by sternum 3 and the metafemora. The group is defined, the two Nearctic and four Palaearctic species included are reviewed, and a key is given for their identification. Phylogenetic relationships with otherAgabusspecies groups are discussed, and a phylogeny for the species in theaffinis‐groupis suggested.