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Suborder Eupnoi

Desert Harvestman - Eurybunus Harvestman - Eumesosoma roeweri Harvestman - Trachyrhinus favosus Harvestman - Caddo pepperella Harvestman - Phalangium opilio harvestmen behavior - Leiobunum politum Harvestman - Odiellus pictus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Opiliones (Harvestmen)
Suborder Eupnoi
Synonyms and other taxonomic changes
Eupnoi is separated into well-supported subgroups, including Phalangioidea and Caddoidea.
Over 2100 described species worldwide, including at least 219 described species in North America.
Generally, legs thin and long with respect to body. Body appears to be a single fused segment.

Eupnoi are long-legged wanderers (typical "daddy longlegs"), and essentially all harvestmen collected (or seen) by researchers or interested naturalists are members of this suborder. An example is the conspicuous and abundant Leiobunum of the eastern US; a western equivalent would be Protolophus (although only active in the Spring & early Summer).
Throughout USA and Canada, from the USA border with Mexico to at least 73° N in Canada.
Most Eupnoi are found in forested habitats, although some western species are harsh desert-dwellers (e.g., Eurybunus), or found at high-elevations (e.g., Leptobunus, Togwoteeus).
Print References
Cokendolpher, J.C., and V.F. Lee. 1993. Catalogue of the Cyphopalpatores and bibliography of the harvestmen (Arachnida, Opiliones) of Greenland, Canada, U.S.A., and Mexico. Vintage Press: Lubbock, TX, USA. (online PDF)

Crawford, RL, 1992. Catalogue of the genera and type species of the harvestman superfamily Phalangioidea (Arachnida). Burke Museum Contributions in Anthropology and Natural History, 8: 1-60. (online PDF)