Review of species of Trisetacus (Acari: Eriophyoidea) from North America, with comments on all nominate taxa in the genus.
Species of Trisetacus inhabit coniferous trees in the families Pinaceae, Cupressaceae and Taxodiaceae. Mites in the genus from North America are revised, and a key for the 22 species recognized is presented. A diagnosis and a review of host-plant and distribution data are presented for each of these species. A comprehensive review of all nominate species and subspecies is included, to facilitate the appropriate usage of available names.