In this study, the genetic diversity of Iranian populations of two widespread Stenus species representing two ecomorphological forms, the "open living species" Stenus erythrocnemus Eppelsheim, 1884 and the "stratobiont" Stenus callidus Baudi di Selve, 1848, is presented using data from a fragment of the mitochondrial COI gene. We evaluate the mitochondrial cytochrome oxidase I haplotypes and th...