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

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Almanac of Alberta Oribatida 2.3 13 January 2013World species: 3 valid species including the cosmopolitan P. aphidinus.Comments: A number of species names have been proposed for immature higher oribatids thatwere confused with Parhypochthonius adults.Canadian species listed on DOC (bold = AB): Parhypochthonius aphidinus Berlese, 1904;Parhypochthonius aphidinus octofilamentis Jacot, 1938*Parhypochthonius aphidinus Berlese, 1904Also Known As: none.ABMI code/Common name: PARHAPHDiagnostic characters: bo pectinate; opisthonotal glands spout-likeOverview: This widely distributed parthenogenetic species is currently known in Alberta onlyfrom the Finnamore Farm near Onoway (53.77N, 114.06W).Barcodes:ID Check: Determination by DEW (Walter, in prep.).Similar taxa: Parhypochthonius aphidinus octofilamentis Jacot, 1938 reported from ON.ABMI Site Records: 2007: none. 2008: none. 2009: none. 2010: none. 2011: none.DOC (1/2008): [+other] Distribution: ON, QC; [Onoway (53.77N, 114.6W); Gopher Hill(53°42'0"N, 112°45'17")];Images: LMEcology: Only females are known and this mite is undoubtedly parthenogenetic. The Albertacollections are from farmland/pasture.Literature: Marshall et al. (1987); Walter (in prep.)Gehypochthoniidae Strenzke, 1963Gehypochthonius Jacot, 1936Diagnostic characters: Poorly sclerotized, pale coloured mites with subcylindrical bodies;opisthosomal gland opening sessile, seta f2 absent; peranal plates absent; epimere II with 2pairs of setae; genae with 2 pairs of setae (a, m)Also Known As: none.Type species: Gehypochthonius rhadamanthus Jacot, 1936World species: 8 species.Comments:Canadian species listed on DOC (bold = AB): Gehypochthonius rhadamanthus Jacot, 193638
Almanac of Alberta Oribatida 2.3 13 January 20136. Key to adult Gehypochthonius in Canada1. Genital plates with 5 or fewer pairs of setae, one pair of aggenital setae ........................................................................................................................ Gehypochthonius gracilis Pankov, 2002- Genital plates with 9 setae (6 medial +3 lateral), 2 pairs of aggenital setae ................................................................................................................Gehypochthonius rhadamanthus Jacot, 1936**Gehypochthonius gracilis Pankov, 2002Also Known As: none.ABMI code/Common name: GEHYGRADiagnostic characters: bo with spinose club; 5 pairs genital setae.Overview: in alcohol: 632 (4); widely distributed parthenogenetic speciesBarcodes:ID Check: Determination by DEW based on Pankov (2002); Pankov by light microscope image(2008).Similar taxa: E. mahunkai (much smaller, bo with 4 long tines, 3 pairs aggenital plates; famuluswith large knob and short tine); E. crosbyi (larger, bo with sessile spicules; famulus withsmall knob and short tine; 2 pairs of aggenital plates)ABMI Site Records: 2007: none. 2008: 1635 SE (residuals). 2009: none. 2010: none. 2011:none.DOC (1/2008): [+other] Distribution: [Moose Pasture Research Site 8 km W Chipman, AB(53.656667, -112.759444)]; Gehypochthonius rhadamanthus Jacot, 1936 is reported fromYT, ON, QC [BC]Images: LMEcology:Literature: Pankov (2002); Walter (in prep.)Back to Table of Contents39
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A guide to Oribatid Identification for the ABMI: - Royal Alberta Museum

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