Hygrobates trigonicus Koenike 1895

Hygrobates trigonicus Koenike, 1895 – complex (Fig. 8E) Published records: Croatia: Žeželj Vidoša et al. (2023); Greece: Pešić et al. (2021b). Distribution: Western Palaearctic. New barcode sequences: Greece: BOLD:AEB5924 (BSNTN1965-24). BINs: BOLD:AEN6851, BOLD:AEN7131, BOLD:AEB5924. BIN Distribution: BOLD:AEN6851 (Albania, Greece), BOLD:AEN7131 (Greece), BOLD:AEB5924 (Greece). Remarks: Recently, the study of Pešić et al. (2021b) revealed the presence of at least two genetically different clusters of this species in Europe, with the genetic distance beyond intraspecific level. As emphasized by Pešić & Esen (2022), the taxonomic status of European clades from Germany (possible conspecific with H. trigonicus) and Greece, respectively, should be clarified by resolving the taxonomic status of H. properus Láska, 1954. The latter species, originally described based on a female from the Orava River and its tributaries in Slovakia (Láska 1954) and later synonymized by Smit et al. (2015), has been reported from Bulgaria by Petrova (1976).