A guide to Oribatid Identification for the ABMI: - Royal Alberta Museum

Almanac of Alberta Oribatida 2.3 13 January 2013Figure 7.45. With 8 or 9 pairs of genital setae, of which 3 are usually near anteromedial corner of plate; setain barbed, usually longer than sensillus; ex small, but usually present; trochanters III & IVwith 2 setae; tarsi with 1, 2 or 3 claws ........................................................................................................................................... Rhysotritia Märkel & Meyer, 1959 (=Acrotritia Jacot, 1923)- With 4 or 5 pairs of genital setae, none concentrated near anteromedial corner; seta in thin,smooth, much shorter than sensillus; ex usually only alveolus; trochanters III & IV with 1seta; monodactyl ..................................................................................Microtritia Märkel, 1964Euphthiracaridae Jacot, 1930 (ITIS 733413)Comments: As well as the usual nomenclatorial morass that is typical in the Oribatida, theEuphthiracaridae contains one very well known genus, Rhysotritia Märkel & Meyer, 1959,that is a junior synonym of Acrotritia Jacot, 1923. Rhysotritia is used in the Almanac forconsistency with the literature.Euphthiracarus Ewing, 1917 (ITIS 733666)Diagnostic characters: genital region covered by a single genital-aggenital plate; anal regionwith a single anal-adanal plate; notogaster often pitted or sculptured (at least anteriorly);bothridial scale ventral; anterior and posterior interlocking triangles present; usuallysculptured (ridged or foveolate); solenidion s present on genu IV; palps 3-segmentedAlso Known As: none in current use.Type species: Phthiracarus flavus Ewing, 1908World species: ~65Comments: Only one species of Euphthiracarus appears to be common in Alberta and I haveidentified this mite as Euphthiracarus flavus (Ewing, 1908) based on Niedbala (2002).42