Trechus, Clairville, 1806

Kostova, Rumyana & Bekchiev, Rostislav, 2025, New insights into the taxonomy of Trechus Clairville, 1806 (Coleoptera: Carabidae) in the Balkans, with the first description of the male of Trechus bohemorum Pawlowski, 1973, Zootaxa 5661 (4), pp. 538-552 : 544

2. The Trechus ‘ subnotatus’ species group

Taxa of the “ subnotatus ” group are known for their high variability in diagnostic characters, with many intermediate forms difficult for identification, particularly at the subspecies level ( Jeannel 1927; Pawlowski 1973; Hieke & Wrase 1988; Kostova & Bekchiev 2023). Study of the “subnotatus ” group material in the Coleoptera collection of NMPC yielded new taxonomic insights and new data on the distribution of two T. cardioderus subspecies, based on their revised identification.