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The early history of the genus Tydeus, the type genus of the family Tydeidae, is complex and convoluted and, subsequently, even the identity of the type species of the family remains unclear. First, the literature is thoroughly analysed and morphological characters of some species are reappraised. After studying Oudemans' types, two species inquirendae, Tydeus croceus and T. cruciatus, are redescribed and a third, T. spathulatus, removed from synonymy and reinstated as a valid species. A fourth species, confused with T. spathulatus, is described. A lectotype is designated for T. spathulatus and a neotype for T. croceus. After discussion, the genus Lorryia Oudemans, 1925 is re‐established in its pristine state. As the redescribed species were designated as type species by Oudemans, the following new generic synonymies are proposed: Raphitydeus Thor, 1933 and Lorryia Oudemans, 1925 sensu Kaźmierski (1989, 1998) are junior synonyms of Brachytydeus Thor, 1931; Homeotydeus Andre, 1980 (partim) and Pseudolorryi...

The genus Oriola Baker, 1968 is resurrected. Edbakerella, Edbakerellinae and Edbakerellidae are proposed as replacement names, respectively for Meyerella Baker, 1968; Meyerellinae Andre, 1980; and Meyerellidae Andre, 1980.

Camisia carrolli n. sp., an oribatid mite collected in Oregon, U. S. A., is described. This species living on Douglas fir is compared with two other arboreal species: C. segnis (Hermann) and C. horrida (Hermann). The description and comparisons deal with both the adult and immatures. Specific criteria for determining immatures of Camisia are explored.