The southern Appalachians are suspected to contain the highest concentration of remaining undescribed diversity. An additional 13 species do not fit within an identification group. We organize these species into four species complexes that include 13 identification groups. Our findings indicate that total diversity of Torrenticola in the United States and Canada comprises 90 species, 57 known from the east and 33 from the west. We describe 66 new species and re-describe all previously described regional species. esbelta Cramer, 1992 is a junior synonym of T. neoconnexa Habeeb, 1957 is a junior synonym of T. rectiforma Habeeb, 1974 is a junior synonym of T. mercedensis (Marshall, 1943) is a junior synonym of T. Our results indicate the need to synonymize four species: T. All previously described species from the US and Canada are examined. Relationships between species are examined with a combined analysis of COI and two expansion regions (D2–3) of the large ribosomal subunit (28S rDNA) for 57 specimens. Species hypotheses are derived from a phylogenetic analysis of the barcoding region of cytochrome c oxidase subunit 1 (COI) for 476 specimens and supported with morphology and biogeography. Material examined includes approximately 2,300 specimens from nearly 500 localities across the United States and Canada, and a few collections in Mexico and Central America. The descriptive biology of torrent mites ( Parasitengona: Torrenticolidae: Torrenticola) of North America (north of Mexico) is investigated using integrative methods.
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