New species and records of mites of the family Stigmaeidae (Acari: Prostigmata) collected from mosses in Southern Chile Author Khaustov, A. A. text Acarologia 2016 2016-12-01 56 4 639 679 http://dx.doi.org/10.1051/acarologia/20164150 journal article 10.1051/acarologia/20164150 2107-7207 5401604 Stigmaeus patagoniensis n. sp. ( Figures 23-26 ) Description Female ( Figures 23-26 ) — Length of idiosoma 455, width 300. Idiosomal dorsum ( Figure 23A ) — Idiosoma oval, soft, mostly covered by smooth dorsal plates. Eyes present. Propodosomal plate with setae vi , ve and sci ; setae sce situated on separate platelets. Postocular bodies large, weakly defined. Striae anteriorly to propodosomal plate without microtubercles. Setae c 1 , d 1 and e 1 blunt-ended, other dorsal setae pointed. All dorsal setae smooth. Setae ve , sce , c 2 , e 2 and f 1 very long and flexible. Ratio ve/sci = 7,8. Central hysterosomal plate with two pairs of setae. Suranal plate not divided, with two pairs of setae. Lengths of dorsal setae: vi 64, ve 150, sci 19, sce 135, c 1 43, c 2 135, d 1 35, d 2 125, e 1 34 , e 2 135, f 1 140, h 1 56, h 2 61. Idiosomal venter ( Figure 23B ) — Ventral setae smooth or weakly barbed, pointed. Three pairs of aggenital setae; ag 1 situated on small platelets; ag 2-3 on single platelet. One pair of genital setae. Endopodal plates without subcuticular reticulation. Lengths of ventral setae: 1 a 36, 1 b 35, 1 c 65, 2 b 52, 2 c 33, 3 a 31, 3 b 29, 3 c 23, 4 a 36, 4 b 23, 4 c 25, ag 1 27, ag 2 25, ag 3 36, g 17, ps 1 70, ps 2 35, ps 3 24. Gnathosoma ( Figure 24 ) — Tibial claw large. Setae l’ of palpal tibia spine-like. All palpal setae pointed; setae of femur and genu weakly barbed; all setae of palptarsus smooth. Number of setae on palpal segments: Tr 0, Fe 3 ( d , l’ , v" ), Ge 2 ( d , l" ), Ti 3 ( d , l’ , l" ), Ta 8(1) (fused eupathidia ul’ , ul" , sul , eupathidion acm , ba , bp , lp , 1 solenidion ω ). Palpal supracoxal setae ( ep ) with thickened basal part and thin distal one. Chelicerae dorsally smooth. Rostrum of subcapitulum long. Subcapitular setae pointed; n weakly barbed, other subcapitular setae smooth. Basal part of subcapitulum without reticulation. Lengths of subcapitular setae: m 48, n 26, or 1 25, or 2 28. Legs ( Figures 25 , 26 ) — Empodial raylets weakly capitate. Leg segments without reticulation. Leg I ( Figure 25A ). Coxae I posterodorsally with supracoxal setae ( el ) thickened basally and thin in distal half. Leg setation: Tr 1 ( v’ ), Fe 6 ( d , l’ , l" , v’ , v" , bv" ), Ge 4 ( d , l’ , l" , k ), Ti 5(2) ( d , l’ , l" , v’ , v" , φ , φp ), Ta 13(1) ( p’ , p" , tc’ , tc" , ft ’, ft" , u’ , u" , a’ , a" , pl’ , pl" , vs , ω ). Setae d of tibia, ( p ), ( tc ) and ( ft ) of tarsus are eupathidia. Seta k 8 needle-like. Solenidion ω 27, finger-shaped; solenidion φp 31 attenuate. solenidion φ 10 baculiform. Tarsal setae vs , ( pl ) weakly barbed, other tarsal setae smooth. Leg II ( Figure 25B ). Leg setation: Tr 1 ( v’ ), Fe 5 ( d , l’ , l" , v’ , bv" ), Ge 4 ( d , l’ , l" , k ), Ti 5(1) ( d , l’ , l" , v’ , v" , φp ), Ta 9(1) ( p’ , tc’ , tc" , u’ , u" , a’ , a" , pl’ , vs , ω ). Setae p’ , tc’ of tarsus and d of tibia are eupathidia. Solenidion ω 17 finger-shaped; solenidion φp 25 attenuate. Tarsal setae pl’ , vs and ( a ) weakly barbed, other tarsal setae smooth. Leg III ( Figure 26A ). Leg setation: Tr 2 ( l’ , v’ ), Fe 3 ( d , l’ , ev’ ), Ge 1 ( d ), Ti 5(1) ( d , l’ , l" , v’ , v" , φp ), Ta 7(1) ( tc’ , tc" , u’ , u" , a’ , a" , vs , ω ). Solenidion ω 8 baculiform; solenidion φp 20 attenuate. Seta ( tc ) of tarsus smooth, other tarsal setae barbed. Leg IV ( Figure 26B ). Leg setation: Tr 1 ( v’ ), Fe 2 ( d , ev’ ), Ge 1 ( d ), Ti 5(1) ( d , l’ , l" , v’ , v" , φp ), Ta 7(1) ( tc’ , tc" , u’ , u" , a’ , a" , vs , ω ). Solenidion ω 8 baculiform; solenidion φp 20 attenuate. Setae d of tibia long and smooth. Setae ( tc ) of tarsus smooth, other tarsal setae weakly barbed. FIGURE 24: Stigmaeus patagoniensis n. sp. , female: A – gnathosoma dorsally, B – subcapitulum. FIGURE 25: Stigmaeus patagoniensis n. sp. , female: A – leg I, B – leg II. FIGURE 26: Stigmaeus patagoniensis n. sp. , female: A – leg III, B – leg IV. Male and immatures unknown. Type material — Female holotype , slide AT260115 /S, Chile , the Region of Magallanes , Nothofagus forest, in Sphagnum sp. , 53°41’08.8"S , 70°58’24.2"W , 26 January 2015 , coll. A.V. Tolstikov. Etymology — The name of the new species refers to its distribution in Patagonia. Differential diagnosis — The new species is most similar to S. flexisetus n. sp. , by smooth dorsal plates, presence of eyes, long and flexible dorsal setae ve , sce , c 2 , e 2 and f 1 . However, it differs from the latter by much shorter and blunt-ended setae c 1 , d 1 and e 1 (vs. much longer and pointed in S. flexisetus ), presence of seta d on genu III (vs. absent in S. flexisetus ), presence of seta d on genu II (vs. absent in S. flexisetus ).