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

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Almanac of Alberta Oribatida 2.3 13 January 2013Literature: Tarman (1968); Luxton (1972); Gilyarov & Krivolutsky (1975); Marshall et al.(1987); Smrz (1989); Behan-Pelletier & Bissett (1994); Weigmann (2006).Fig. 3.3Eniochthoniidae Grandjean, 1947 (ITIS 733393)Comments: These are small, yellowish and somewhat laterally compressed mites associated withwet moss that appear to be on their way towards the evolution of ptychoidy.Eniochthonius Grandjean, 1933 (UBIO 94634384)Diagnostic characters: Small enarthronotes with one incomplete anterior notogastral band (moreeasily seen before slide-mounting) and a complete notogastral scissure; setae of row epresent; body yellowish, notogaster bulb-like, more or less laterally compressed. Unlessstrongly cleared, slide-mounted specimens have a ‘salt and pepper’ cuticle from mineralinclusions.Also Known As: Hypochthoniella Berlese, 1910; Arthrochthonius Ewing, 1917Type species: Hypochthonius minutissimus Berlese, 1904World species: 6 species including three from North America: Eniochthonius minutissimus(Berlese, 1903), E. crosbyi (Ewing, 1909), E. mahunkai Norton & Behan-Pelletier, 2007Etymology – Enioch (?) + chthonius (of the soil)Comments: The three known North American species have been identifiable only since Norton &Behan-Pelletier (2007).32
Almanac of Alberta Oribatida 2.3 13 January 2013Canadian species listed on DOC (bold = AB): Eniochthonius minutissimus (Berlese, 1903);Eniochthonius sp.4. Key to adult Eniochthonius in North America1. Sensillus pectinate (Fig. 4.1B, C); small mites generally less ....................... 2- Sensillus spiculate, long pectines absent (Fig. 4.1A); larger mites 380- ................................................................................................... Eniochthonius crosbyi (Ewing, 1909)2. Sensillus with 9 or more long tines (Fig. 4.1B); 2 pairs of aggenital plates; 355-380 long ..................................................................................... Eniochthonius minutissimus (Berlese, 1903)- Sensillus with 2-5 long tines (Fig. 4.1C); 3 pairs of aggenital plates; 309-343 long .........................................................................Eniochthonius mahunkai Norton & Behan-Pelletier, 2007A B CFig. 4.1*Eniochthonius crosbyi (Ewing, 1909) (RAM 99000132)Also Known As: Eniochthonius borealis Jacot, 1939; Hypochthoniella borealis (Jacot, 1939).ABMI code/Common name: ENIOCRO; Common Name: Crosby’s Scissure-miteDiagnostic characters: 380-450 long; bo with sessile spicules; famulus with small knob andshort tine; 2 pairs of aggenital platesOverview: Species of Eniochthonius are small, yellow mites with two transverse bands runningacross their backs. This is the largest of the three species in this genus found in Alberta.Adults are yellow, with a diamond shaped body and 0.385-0.450 mm long. Albertacollections are larger than in eastern North America, but otherwise consistent.Barcodes: 412 (0), 444 (0 x 3)ID Check: Determination by DEW based on Norton & Behan-Pelletier (2007).Similar taxa: E. mahunkai (much smaller, bo with 4 long tines, 3 pairs aggenital plates; famuluswith large knob and short tine); E. minutissimus (smaller, bo with 9 or more tines; 2 pairs ofaggenital plates; famulus with small knob and long tine)33
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A guide to Oribatid Identification for the ABMI: - Royal Alberta Museum

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