Neighbor-Joining tree based on COI K2P pairwise distances for sequences of Agabus uliginosus s. l. and Agabus margareti (BOLD taxonomic backbone uses the incorrect name A. margaretae for this species, see introduction for more information) used as an outgroup. Names written in bold have genitalia examined for morphological discrimination between ‘lotti’ and ‘uliginosus s. str.’ types. Each sequence name consists of parts separated by a lower dash: (1) BOLD Process ID, and for the Hungarian specimens the specimen codes used in morphological analyses are also given, (2) species (types), and (3) country of origin. The results of the three species delimitation methods are indicated by vertical bars (BIN numbers given). Only bootstrap supports higher than 50% are shown.