Myrmecophilous pygmephoroid mites (Acari: Pygmephoroidea) associated with Lasius flavus (Hymenoptera: Formicidae) in Russia Author Khaustov, Alexander A. text Zootaxa 2015 4044 3 345 370 journal article 10.11646/zootaxa.4044.3.2 85f40547-c8b2-4f67-9436-504d6fdb5600 1175-5326 231968 E3150581-26D9-4713-A70B-3A87AFB07BC3 Scutacarus sibiriensis sp. nov. ( Figs. 13–15 ) Description . FEMALE. Length of idiosoma 160 (145–160), width 165 (150–165). Gnathosoma similar to that of S. moseri sp. nov . Idiosomal dorsum ( Fig. 13 A, 14A): Prodorsum completely covered by tergite C, with 2 pairs of smooth needle-like setae v 2 and sc 2, 1 pair of barbed capitate trichobothria ( Fig. 14 A), and 1 pair of oval stigmata situated ventrally ( Figs. 13 B). All dorsal shields with numerous small dimples. Setae e and h 2 vestigial, setae f and h 1 smooth, needle-like, other dorsal setae distinctly barbed and blunt-ended. Cupules ia on tergite D and ih on tergite H large and round. Tergites EF and H each with 1 pair of oval porous fields situated anteriorly to setae f and h 1. Lengths of dorsal setae: c 1 28 (26 – 28), c 2 24 (22 – 24), d 33 (28–33), f 7 (7), h 1 8 (9). Distances between setae: c 1– c 1 47 (45–47), d–d 84 (79–84), f–f 85 (75–85), h 1– h 1 41 (37–41). Idiosomal venter ( Fig. 13 B): All ventral plates with numerous small dimples. Ap1 well-developed and joined with appr, ap2 thin, w-shaped, joined with appr; apsej well-developed and joined with appr. Sta absent. Apodemes 3 absent, ap4 short, joined with appo. Apodemes 5 joined with appo, diffuse. Setae 2 b slightly thickened, smooth, blunt-ended, setae 4 a smooth, pointed, situated anteriorly to level of setae 4 b , setae ps 3 short, smooth, blunt-ended. Other ventral setae sparsely barbed. Secondary transverse sclerotized line on poststernal plate absent. Ags complicate, consists of median tongue-like elongation connected with sclerotized oval structure ring laterally with tube-like sclerites, pgs large, triangular. Lengths of ventral setae: 1 a 28 (24–28), 1 b 20 (19–20), 2 a 19 (19–21), 2 b 17 (16–17), 3 a 23 (21–23), 3 b 31 (28–31), 3 c 26 (22–26), 4 a 13 (11–13), 4 b 29 (26–29), 4 c 28 (19–28), ps 1 20 (17–20), ps 2 19 (16–19), ps 3 4 (4). Legs ( Figs. 14 , 15 ). Leg setation as in S. heterotrichus sp. nov . except absence of seta v” of femur I. Leg I ( Figs. 14 B). Tibiotarsus with large tarsal claw, tapered at its end. Seta k smooth, blunt-ended, eupathidion tc” situated on long pinnaculum; tc’ on short protuberance. Lengths of solenidia: ω 1 9 (7–9)> ω 2 6 (4–6) = φ 1 6 (5–6)> φ 2 5 (4–5); ω 2 and φ 2 baculiform, φ 1 clavate, ω 1 finger-shaped. Seta dFe thickened, smooth, pointed. Seta l’ of femur smooth, bluntended. Leg II ( Fig. 14 C). Tarsus with large padded claws and well developed flipper-like empodium. Solenidion ω 8 (7–8) finger-shaped, solenidion φ 4 (3–4) weakly clavate. Setae l’ and v” of femur short, needle-like. Seta pl” spine-like, smooth, u’ blunt-ended and barbed in distal half. Leg III ( Fig. 15 A). Claws of same shape as on tarsus II. Solenidion φ 4 (3–4) weakly clavate. Setae pl” spine-like, smooth, u’ blunt-ended and barbed in distal half. Leg IV ( Fig. 15 B). Setae d of femur, d and tc’ of tibiotarsus blunt-ended. Tibiotarsus about as long as its width. Seta tc’ much longer than other setae of tibiotarsus. FIGURE 12 . Scutacarus heterotrichus sp. nov . , female: A—leg III in dorsal view, B—leg IV in dorsal view. FIGURE 13 . Scutacarus sibiriensis sp. nov . , female: A—idiosomal dorsum, B—idiosomal venter. MALE and LARVA unknown. Type material . Female holotype (slide VS 030814 ) and 14 female paratypes , RUSSIA , Tyumen Province, Kazanskiy District, vicinity of settlement Kazanskoye, 55° 37' 21.1"N , 69° 22' 17.7"E , in nest of Lasius flavus , 3 August 2014 , coll. V.A. Stolbov; 4 female paratypes , RUSSIA , Tyumen Province, Tyumen District, vicinity of Tyumen, 57°09'50.4"N , 65°27'26.7"E , on Lasius flavus , 21 September 2014 , coll. A.A. Khaustov; 2 female paratypes , same place, 26 July 2014 , on Lasius flavus , coll. A.A. Khaustov. Type deposition . Holotype and 18 paratypes deposited in TUMZ ; 2 paratypes in ZISP . Etymology . The name of a new species is referring to its distribution in Siberia. Differential diagnosis . The new species belongs to the tackei species-group, which is characterized by reduction of setae e and h 2.Females of a new species are most similar to S. suavis Khaustov, 2008 by the absence of secondary sclerotized line on the poststernal plate. They differ from S. suavis by subequal, smooth, needle-like setae f and h 1 (vs. setae h 1 distinctly longer than f and both sparsely barbed in S. suavis ) and by location of setae 4 a clearly anteriad to level of setae 4 b (vs. 4 a clearly posteriad to level of setae 4 b ).