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

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Almanac of Alberta Oribatida 2.3 13 January 2013Rhysotritia ardua (C.L. Koch, 1841) (UBIO 99000061)Also Known As: Hoplophora ardua C.L. Koch, 1841; Acrotritia americanus (Ewing, 1909);Euphthiracarus americanum (Ewing, 1909); Acrotritia sinensis Jacot, 1923ABMI code/Common name: RHYSARD / Variable Box MiteDiagnostic characters: Aspis 270-310, notogaster 430-520, mostly brown to dark-brown (rarelyyellow-brown or yellow). Tarsal claw formula 2-3-3-3. Prodorsum with single carina, bo(80-95) with distal half barbed on anterior face; in (110-120) erect, barbed, +/- blunt; le (65-75), ro (50-55) both straight, barbed; notogastral setae (58-85) barbed, +/- blunt; notogastergranular, with faint foveae anteriorly; 8-9 pairs genital setae, all shortOverview: Box mites are so called because they can withdraw their legs into their body and closethe front part over the rear, like a box being folded shut. This large (0.700-0.840 mm long),brownish box mite has a Holarctic distribution. Only female mites are known and the miteapparently reproduces parthenogenetically.Barcodes: 444 (0, 0)ID Check: Determination by DEW based on Niedbala (2002).Similar taxa: Euphthiracarus spp. have a ventral bothridial scale and usually have sculpturednotogasters. Young specimens of R. ardua may be yellow-brown in colour and could beconfused with Euphthiracarus; all slided specimens checked against Niedbala (2002); 1434SW 24 appears to be monodactyl, but is not R. curticephala (R. monodactylea introduced inFL).ABMI Site Records: 2007: 216, 330, 331, 358, 360, 388, 389, 515, 545, 585, 616, 631, 633, 663,665, 791, 1603, BOG6, BOG7. 2008: 444, 719, 974, 1222, 1224, 1434, BOG1, BOG3,FM07. 2009: 498, 508, 529, 530, 530, 537, 560, 561, 570, 698, 883. 2010: 324, 325, 352,353, 354, 383, 384, 1036, 1142, 1170, 1171, 1175, 1652, OG-972-1. 2011: .DOC (1/2008): [+other] Distribution: AB, YT, NU, NT, SK, MB, ON, QC, NB, NS, NF[Cosmopolitan]Images: SEM (Onoway)Ecology: A mesophilous mite found in many habitats including bogs. Parthenogenetic(thelytokous): gravid females carry up to 3 eggs. Gut boli usually have coarse organicmaterial and dark and clear hyphae.Literature: Gilyarov & Krivolutsky (1975); Marshall et al. (1987); (Behan-Pelletier & Bissett1994); Niedbala (2002); Weigmann (2006).*Rhysotritia diaphoros Niedbala, 2002Also Known As:ABMI code/Common name: RHYSDIADiagnostic characters: Female aspid length 245, notogaster 535, yellow brown in colour. Tarsalformula 2-3-3-1. Prodorsum micropunctate, with single carina; bo (~85) scimitar-shapedbarbs along anterior margin increase in size distally; in (~85) erect, barbed in distal 2/3rds;le (49), ro (40) similar; ex (13) fine, simple. Notogaster densely microtuberculate, setae (40-48
Almanac of Alberta Oribatida 2.3 13 January 201360) erect and barbed in distal half. Genital-aggenital shield with 9 short setae (3+6); analadanalplate with 5 pairs erect setae (47-53) barbed distally and one minute seta (an3).Overview: Box mites are so called because they can withdraw their legs into their body and closethe front part over the rear, like a box being folded shut. This yellowish brown box mite isvery similar to Rhysotritia ardua, but has only a single claw on legs IV.Barcodes:ID Check: Determination by DEW based on Niedbala (2002).Similar taxa: Young specimens of R. ardua may be yellow-brown in colour.ABMI Site Records: 2007: none. 2008: none. 2009: 1305. 2010: none. 2011: none.DOC (1/2008): [+other] Distribution: ONImages:Ecology:Literature: Niedbala (2002).Oribotritiidae Grandjean, 1954 (ITIS 733412)Mesotritia Forsslund, 1963 (ITIS 73xxxx)Diagnostic characters: bothridial scale ventral; setae le well anterior to setae in and displacedlaterally, inserted near margin of aspis; distance between setae le ~ to that between setae inor greater; genu IV without solenidion.Also Known As: Entomotritia Märkel, 1964Type species: Phthiracarus flagelliformis Ewing, 1909World species: 29 including the cosmopolitan Mesotritia atractos Niedbala, 2004; Holarctic M.flagelliformis (Ewing, 1909); and a number of North American species.Comments:Canadian species listed on DOC (bold = AB): Mesotritia flagelliformis (Ewing, 1909);Mesotritia nuda (Berlese, 1887); Mesotritia sp.; [NB - Maerkelotritia alaskensis Hammer,1967, M. cryptopa (Banks, 1904), and M. kishidai (Aoki, 1958) are reported from BC]Mesotritia nuda (Berlese, 1887) (ITIS 73xxxx)Also Known As: Oribotritia brachythrix Walker, 1965; Mesotritia brachythrix (Walker, 1965)ABMI code/Common name: MESONUD / Naked Box MiteDiagnostic characters: aspis 330-480, notogaster 575-890; bo clubbed; notogastral setae short;5-7 pairs genital setaeOverview: Box mites are so called because they can withdraw their legs into their body and closethe front part over the rear, like a box being folded shut. This Holarctic species appears tobe rather rare in Alberta and may be restricted to disturbed habitats.49
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A guide to Oribatid Identification for the ABMI: - Royal Alberta Museum

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