Eustigmaeus parvisetus ( Chaudhri, 1965 )

Khaustov, Alexander A. & Tolstikov, Andrei V., 2014, A new species and new records of the genus Eustigmaeus (Acari: Prostigmata: Stigmaeidae) from Western Siberia, Zootaxa 3861 (6), pp. 531-553 : 547-551

Eustigmaeus parvisetus ( Chaudhri, 1965)

( Figs. 34–43 )

Ledermuelleria parviseta ( Chaudhri, 1965) , p. 474, figs. 10–12, 29.

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.

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.

Figures

FIGURES 34 – 35. Eustigmaeus parvisetus (Chaudhri, 1965), female: 34 — idiosomal dorsum, 35 — idiosomal venter.

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.