NJ-tree of Phronia prolongata sp.n. and related taxa based on COI  (mtDNA) sequences and K2P distances (data from BOLD database).  95–98 represent P. prolongata sp.n. specimens studied here; the species displays a notable intraspecific variation of the barcoding gene COI, but all specimens are considered conspecific. The Canadian specimen is a female, and its identification is solely based on the COI sequence; Nearctic male specimens should be seen in order to validate the taxonomic assignment proposed here.