Pruned and stylized mtCOI maximum likelihood phylogenetic tree of Bootanomyia dorsalis and close relatives. Ultra-fast bootstrap scores > 90 are shown next to their respective nodes. Tip labels highlighted in red were collected from the Pacific coast. Sequences from the same collection site and host gall have been removed for simplicity (see Suppl. material 1: fig. S1 for the complete tree). Sequences highlighted in blue were collected from samples in New York. All other sequences were acquired from previously published data. GenBank accession numbers for these sequences can be found in Suppl. material 1: table S2. Similarity scores are shown for clades where Nearctic and Palearctic sequences are both present. The score represents the range of genetic distance between Nearctic and Palearctic sequences.