A new species and new records of the genus Eustigmaeus (Acari: Prostigmata: Stigmaeidae) from Western Siberia Author Khaustov, Alexander A. Author Tolstikov, Andrei V. text Zootaxa 2014 3861 6 531 553 journal article 10.11646/zootaxa.3861.6.2 fb954baf-d5f6-4290-b872-a469fb8a157e 1175-5326 226041 3316AC78-A115-4F2E-9DDD-25F266FC114D Eustigmaeus parvisetus ( Chaudhri, 1965 ) ( Figs. 34–43 ) Ledermuelleria parviseta ( Chaudhri, 1965 ) , p. 474, figs. 10–12, 29. FIGURES 34–35 . Eustigmaeus parvisetus (Chaudhri, 1965) , female: 34—idiosomal dorsum, 35—idiosomal venter. Redescription. FEMALE ( Figs. 34–43 ). Body well sclerotized. Idiosoma almost round in outline. Length of idiosoma 505–510, width 425–455. Idiosomal dorsum ( Fig. 34 ). Dorsal plates with numerous subequal dimples. Dorsal setae lanceolate, smooth, with hyaline sheath (Figs. 36, 37). Suranal plate ventral. Diameter of eyes 18–19. Length of dorsal setae: vi 58 –63, ve 75–77, sci 43–48, sce 62–63, c 1 54–56, c 2 15–16 , d 1 62–64, d 2 61–64, e 1 79 –80, e 2 69 –71, f 1 81–84, h 1 58–59, h 2 36–46,. Distances between setae: vi– vi 42–44, ve–ve 155–160, sci–sci 300–305, sce–sce 375–390, c 1– c 1 130–135, d 1– d 1 100–105, d 2– d 2 395–410, e 1– e 1 205–215, e 2– e 2 295–315, f 1– f 1 135–140. Idiosomal venter ( Fig. 35 ). With 1 large callosity between idiosomal plate and humeral plate. Endopodal plates separated medially, distinctly reticulated. Humeral plate triangular, with dimples. Aggenital plate with dimples, bearing 2 pairs of simple aggenital setae. Pseudanal covers with 3 pairs of simple pseudanal setae; setae ps 1 thicker than ps 2– ps 3. Setae h 1 distinctly barbed. Setae 4 a absent. Length of ventral setae: 1 a 23–24, 1 b 18–21, 1 c 15–19, 2 b 18–19, 2 c 14–15, 3 a 20–28, 3 b 18–19, 3 c 17–19, 4 b 23–25, 4 c 24–25, ag 1 18–20 , ag 2 23–24 , ps 1 26–28 , ps 2 20–22 , ps 3 25–27. Gnathosoma (Figs. 38–39). Tibial claw large. Setae l’ on palpal tibia spine-like. Setae on palpal femur and genu barbed, other palpal setae smooth. Number of setae on palpal segments as in E. tjumeniensis sp. nov . FIGURES 36–39 . Eustigmaeus parvisetus ( Chaudhri, 1965 ) , female: 36—seta sci , 37—seta e 1 , 38—gnathosoma dorsally, 39—subcapitulum. FIGURES 40–41 . Eustigmaeus parvisetus (Chaudhri, 1965) , female: 40—leg I, 41—leg II. FIGURES 42–43. Eustigmaeus parvisetus (Chaudhri, 1965) , female: 42—leg III, 43—leg IV. Palpal supracoxal setae ( elcp ) peg-like. Rostrum of subcapitulum almost rectangular (Fig. 39). Subcapitular setae smooth; setae or 1 distinctly thickened and curved. Basal part of subcapitulum without distinct reticulation. Length of subcapitular setae: m 25–27, n 22–23, or 1 11–12 , or 2 10–11. Legs ( Figs. 40–43 ). All legs with a pair of very large claws. Empodial raylets pointed. Leg setation as in E. collarti . Leg I ( Fig. 40 ). Coxae I posterodorsally with peglike leg supracoxal setae ( elcl ). Setae d , l’ , l” on tibia, d , l’ , l” on genu, d and l” on femur distinctly thickened, lanceolate. Seta k long 23–24. Solenidion ω relatively short 23–25, finger-shaped; solenidion φ 12–13 baculiform, φp attenuate 29–30. Leg II ( Fig. 41 ). Setae d , l’ , l” on tibia, d , l’ , l” on genu and l” on femur distinctly thickened, lanceolate. Solenidion ω 19–20 finger-shaped; solenidion φ 18–19 attenuate. Seta k 10. Leg III ( Fig. 42 ). Setae d , l’ , l” on tibia, d on genu, d and l’ on femur distinctly thickened, lanceolate. Solenidion ω 5 baculiform; solenidion φ 17–19 attenuate. Leg IV ( Fig. 43 ). Setae d , l’ , l” on tibia, d on genu and d on femur distinctly thickened, lanceolate Solenidion ω 5 baculiform; solenidion φ 15–16 attenuate. MALE. Unknown. Material examined . Two females, RUSSIA : Yamalo-Nenets Autonomous Okrug, Purovsky District, vicinity of Urengoy, from mosses on soil, 28 July 2014 , coll. E.A. Bragin. Remarks . This species was described from lichens on rocks in Alpine County, Luther Pass, Hwy. 89 in the U.S.A. ( Chaudhri 1965 ). This is a new record of E. parvisetus from Eurasia.