A new species of the genus Paravillersia (Acari: Prostigmata: Stigmaeidae) from Western Siberia, with supplementary description of Paravillersia grata Kuznetsov, 1978 Author Khaustov, Alexander A. text Zootaxa 2014 3873 1 journal volume 42399 10.11646/zootaxa.3873.1.5 a235964b-77bd-49a8-9eee-d989bacb75eb 1175-5326 228781 E429C74D-BB94-4E76-B9BB-E689D8102CA0 Paravillersia jamaliensis Khaustov sp. nov. ( Figs. 1–5 ) Description . FEMALE ( Figs. 1–5 ). Idiosoma oval in outline. Length of idiosoma 355 (310–370), width 280 (235–280). Idiosomal dorsum ( Figs. 1 A, 5A–C). Idiosoma almost completely covered by 3 large and weakly sclerotized shields. Prodorsal and hysterosomal shields with weakly developed dimples in lateral parts. Central parts of prodorsal and hysterosomal shields smooth. Diameter of eyes 9 (8–9). Dorsal setae sparsely barbed, distinctly blunt-ended. Setae f 1, h 1, and h 2 distinctly longer and thicker than other hysterosomal setae. Suranal plate dorsal ( Fig. 5 C). Length of dorsal setae: vi 24 (19–24), ve 29 (23–29), sci 21 (15–21), sce 21 (19–21), c 1 21 (18–21), c 2 14 (13–15), d 1 16 (14–16), d 2 16 (14–16), e 1 13 (12–13), e 2 10 (9–10), f 1 31 (30–33), h 1 35 (26–36), h 2 30 (26–31). Distances between setae: vi– vi 50 (48–53), ve–ve 98 (86–100), sci–sci 180 (160–180), c 1– c 1 76 (65–76), d 1– d 1 100 (81–100), d 2– d 2 240 (225–250), e 1– e 1 115 (96–115), e 2– e 2 160 (155–175), f 1– f 1 94 (83–95). Idiosomal venter ( Figs. 1 B, 5D, 5F). With 2 pairs of round callosities between hysterosomal and humeral shields ( Fig. 5 F). Anterior callosity distinctly larger than posterior one. Endopodal plates separated medially, weakly reticulated. Humeral shields smooth. All ventral setae smooth, pointed. With 2 pairs of subequal aggenital, and 3 pairs of subegual pseudanal setae. Setae ps 1 slightly thicker than ps 2 and ps 3. Striae in centre between coxal fields I-II and III-IV, and posteriorly to subcapitulum with microtubercles ( Fig. 5 E). Length of ventral setae: 1 a 23 (22–27), 1 b 19 (19–21), 1 c 13 (12–14), 2 b 11 (11–14), 2 c 12 (12–15), 3 a 30 (24–31), 3 b 12 (11–13), 3 c 11 (11–13), 4 a 18 (14–18), 4 b 10 (9–12), 4 c 10 (10–12), ag 1 10 (9–11), ag 2 10 (9–11), ps 1 17 (16–19), ps 2 11 (10–14), ps 3 12 (11–14). Gnathosoma ( Figs. 2 , 5 E). Tibial claw well-developed. Setae l’ on palpal tibia spine-like ( Fig. 2 A). Setae d on palpal femur distinctly blunt-ended and strongly barbed on distal half, other palpal setae pointed. Palpal supracoxal setae ( ep ) seta–like. Rostrum of smooth subcapitulum ( Figs. 2 B, 5E) very long. Subcapitular setae or 1 smooth, distinctly thickened, curved and blunt-ended; other subcapitular setae simple, pointed. Length of subcapitular setae: m 30 (30–33), n 20 (19–23), or 1 8 (8–9), or 2 14 (13–16). Legs ( Figs. 3–4 ). Empodial raylets capitate. Leg I ( Fig. 3 A). Coxae I posterodorsally with seta-like leg supracoxal setae ( el ). Setae d on tibia and ( p ), ( tc ), ( ft ) on tarsus eupathidia. Setae d on genu and femur distinctly thickened, baculiform, sparsely barbed. Seta k of genu I 11 (11–13) long. Solenidion ω relatively short 15 long (13–15), finger-shaped; solenidion φ 8 long (7–10) baculiform, φp attenuate 21 long (17–23). Leg II ( Fig. 3 B). Setae d of tibia, p’ and tc’ of tarsus represented by eupathidia. Setae d on genu, d and l” on femur distinctly thickened, baculiform, sparsely barbed. Solenidion ω 13 long (11–13) finger-shaped; solenidion φ 19 long (16–19), attenuate. Seta k 6 long (6–7). Leg III ( Fig. 4 A). Solenidion ω 7 long (6–7), baculiform; solenidion φ 15 long (14–15), attenuate. Setae d on tibia and genu distinctly thickened, baculiform, sparsely barbed. Leg IV ( Fig. 4 B). Solenidion ω 4 long (4–5) baculiform; solenidion φ 13 long (15–16) attenuate. Setae d on tibia, genu and femur distinctly thickened, baculiform, sparsely barbed. FIGURE 1 . Paravillersia jamaliensis Khaustov sp. nov . , female: A—idiosomal dorsum, B—idiosomal venter. FIGURE 2 . Paravillersia jamaliensis Khaustov sp. nov . , female: A—gnathosoma dorsally, B—subcapitulum ventrally. FIGURE 3 . Paravillersia jamaliensis Khaustov sp. nov . , female: A—leg I, B—leg II. FIGURE 4 . Paravillersia jamaliensis Khaustov sp. nov . , female: A—leg III, B—leg IV. FIGURE 5 . SEM photos: Paravillersia jamaliensis Khaustov sp. nov . , female: A—body dorsum, B—prosoma dorsally, C—opisthosoma dorsally, D—body venter, E—gnathosoma ventrally, F—ventrolateral part of podosoma. MALE and IMMATURES unknown. Type material . Holotype female, slide № EB 030814 , RUSSIA : Yamalo-Nenets Autonomous Okrug, Priuralskiy Region, vicinity of settlement Katravozh, 66 0 19’40”N, 66 0 05’60”E, from mosses on fen, 3 July 2014 , coll. E.A. Bragin. Paratypes : 12 females , same data as holotype . Type deposition . The holotype and 7 paratypes are deposited in the mite collection of the Tyumen State University Museum of Zoology, Tyumen, Russia ; 5 paratypes are deposited in the mite collection of the Zoological Institute of Eussian Academy of Sciences, St.-Petersburg, Russia . Etymology . The new species name refers to Yamal, the large peninsula in Western Siberia where this species was collected. Differential diagnosis . The new species differs from P. gr a t a by the dorsal position of the suranal plate (vs. ventral in P. gr a t a ); by 2 pairs of the aggenital setae (vs. 3 pairs in P. grata ), and by distinctly shorter dorsal idiosomal setae c 1, d 1, d 2, e 1, and e 2 (10–16 vs. 20–53 in P. g r at a ).