Two unusual new species of Caleremaeus (Acari: Oribatida) from eastern North America, with redescription of C. retractus and reevaluation of the genus Author Norton, Roy A. State University of New York, College of Environmental Science and Forestry, Syracuse, New York, 13210, USA. Author Behan-Pelletier, Valerie M. Invertebrate Biodiversity Program, Research Branch, Agriculture and Agri-Food Canada, K. W. Neatby Bldg., Ottawa, Ontario, Canada. text Acarologia 2020 2020-05-11 60 2 398 448 journal article 8260 10.24349/acarologia/20204375 1d0971e8-a0d9-4e39-921b-0de44a0a6e3c 2107-7207 4487919 393A73A9-253B-4A24-8635-C54C22326D10 Caleremaeus Berlese, 1910 Type species: Damaeus monilipes Michael, 1882 (p. 16). The original combination often has been given in the literature as Notaspis monilipes , but this was a later recombination by Michael (1888). Etymology — Berlese (1910) did not indicate the etymology of Caleremaeus , but the stem eremaios is Greek (meaning solitary) and is the basis for the older genus name Eremaeus Koch, 1835 . The prefix ‘cal’, if also based on Greek, would be from kalos , meaning beautiful. While less likely, Berlese might have mixed languages: if ‘cal’ were Latin-based it could relate to the habitat of the type species C. monilipes , which Michael (1882) collected from rotten wood (Latin: cala , piece of wood). Diagnosis — Brachypylina with small to medium-sized adults (length 306–475 µm ), overall shape elongate-pyriform in dorsoventral view. Integument with enveloping cerotegument, usually with dense, dome- to mushroom-shaped excrescences; sclerotized procuticle partly foveate to foveolate. Prodorsum with or without paired, ridge-like lamella and tutorium; with or without prodorsal enantiophysis. Rostrum with strongly developed submarginal crest. Bothridial seta with basal stalk and flattened, expanded head. Dorso- and pleurophragmata absent. Notogaster without porose organs; anterior margin nearly straight, with small dentate tubercles or knots; with distinct humeral process opposing tubercle(s) on posterior wall of bothridium to form humeral enantiophysis; with strong topography consisting of relatively flat lateral region and two strong bulges (transverse anterior bulge and longitudinal posterior bulge) separated by foveate transverse sulcus; with 10 pairs of setae, marginal to submarginal. Pedotectum I present, II absent; propodolateral apophysis absent; discidial ridge usually present, distinct discidium present or absent; circumpedal carina absent; lateral, parastigmatic and aggenital enantiophyses present; coxisternum with distinct medial fossa between setae 4a . Subcapitular rutellum atelobasic. Legs relatively short, tibiae I, II unusually large, with narrow basal stalk and swollen distal bulb, I with dorsodistal process; pretarsi monodactylous; seta d absent from genua I–III and all tibiae; iteral setal pair present on tarsi I–II, only it ஧ on III, none on IV. Nymphs plicate, eupheredermous, gastronotum with papilliform attachment cornicle; setal pair h 1 adjacent on extension of pygidial sclerite; paraprocts atrichous in larva, proto- and deutonymph. Adult