New species and a record of myrmecophilous mites of the families Neopygmephoridae and Microdispidae (Acari: Heterostigmatina: Pygmephoroidea) associated with Lasius umbratus (Hymenoptera: Formicidae) from Western Siberia, Russia Author Khaustov, Alexander A. text Zootaxa 2016 4137 3 375 390 journal article 10.11646/zootaxa.4137.3.5 bf2fa89f-5107-4e10-baad-a9d715d18cd3 1175-5326 256512 625148B8-9560-4386-9BC9-E9D474EA10A0 Petalomium kurganiensis sp. nov. ( Figs. 5–8 ) Description . FEMALE ( Figs. 5–8 ). Body weakly sclerotized. Length of idiosoma 275 (270–290), width 170 (165– 175). Gnathosoma ( Fig. 6 ). Similar to that of P. brevicaudus sp. nov . Lengths of gnathosomal setae: cha 9 (9–11), chb 15 (15–17), m 13 (13–14). Idiosomal dorsum ( Fig. 5 A). Only posterior part of prodorsum covered by anterior margin of tergite C, with 1 pair of round stigmata with transverse slit-like opening, 2 pairs of setae ( v 2 , sc 2) and 1 pair of clavate and weakly barbed trichobothria ( sc 1) with pointed apex. All dorsal plates smooth. Setae v 2 smooth, other dorsal setae distinctly barbed. Setae sc 2, c 1, c 2 and h 2 pointed, other dorsal setae blunt-ended. Posterior margin of tergite C weakly concave; posterior margin of tergite EF distinctly concave; posterior margin of tergite H without tongue-like elongation. Cupules ia on tergite D and ih on tergite H small, round. Lengths of dorsal setae: v 2 9 (9–11), sc 2 40 (39–44), c 1 65 (61–67), c 2 69 (68–70), d 44 (43–45), e 25 (25–28), f 65 (64–70), h 1 45 (44–47), h 2 26 (26–33). Distances between setae: v 2 –v 2 35 (34–36), sc 2 –sc 2 39 (38–41), c 1– c 1 51 (51–57), c 1– c 2 33 (32–35), d– d 53 (52–55), e–f 12 (12–13), f–f 59 (58–64), h 1– h 1 23 (22–27), h 1– h 2 16 (15–17). Idiosomal venter ( Fig. 5 B). All ventral plates smooth. Setae 1 b not bifurcate. Pseudanal setae smooth, other ventral setae sparsely barbed. Ap1 well-developed and joined with appr; ap2 weakly developed, thin, joined with appr; appr and apsej well-developed; ap3 well-developed, straight. Ap4 well sclerotized, long and joined with appo; apodemes 5 absent. Posterior margin of posterior sternal plate weakly convex in middle part. Posterior margin of aggenital plate rounded. Ags small, bell-like, pgs large, triangular, mgs small, oval. Lengths of ventral setae: 1 a 39 (37–40), 1 b 31 (30–32), 2 a 44 (42–45), 2 b 22 (21–24), 3 a 34 (33–35), 3 b 40 (39–42), 3 c 30 (30–34), 4 a 44 (43–45), 4 b 51 (50–55), 4 c 50 (49– 54), ps 1 23 (22–23), ps 2 23 (22–23), ps 3 15 (14–15). Legs ( Figs. 7 , 8 ). Leg setation as in P. brevicaudus sp. nov . Leg I ( Fig. 7 A) only slightly shorter than leg II. Tibiotarsus not thickened, with terminal claw situated on distinct pretarsus, tip of its claw thin. Lengths of solenidia ω 1 10 (10)> ω 2 5 (4–5) < φ 1 7 (7–8)> φ 2 6 (6–7); ω 2 baculiform, φ 1 and φ 2 weakly clavate, ω 1 finger-shaped. Eupathidium tc” situated on very short pinnaculum. Setae d of femur broadened, slightly curved at the tip. Setae l’ and v’ of genu blunt-ended, barbed; seta l’ of femur blunt-ended, smooth, other leg setae (except eupathidia) pointed and sparsely barbed. Leg II ( Fig. 7 B). Tarsus with sickle-like, padded claws and large flipper-like empodium. Solenidion ω 9 (9) finger-shaped, solenidion φ 5 (5) weakly clavate. All leg setae barbed; setae v’ of genu and l’ of tibia blunt-ended, other leg setae pointed. Leg III ( Fig. 8 A) similar in shape and length to leg II. Claws and empodium of same shape as on tarsus II. Solenidion φ 5 (5) weakly clavate. All leg setae barbed. Seta d of femur blunt-ended, other leg setae pointed. Leg IV ( Fig. 8 B). Tarsus long and thin, pretarsus short, with 2 small simple claws and small empodium. Solenidion φ 6 (6) weakly clavate. All leg setae barbed; setae v’ of genu and tibia and v” of tibia blunt-ended, other leg setae pointed. MALE and LARVA unknown. FIGURE 5 . Petalomium kurganiensis sp. nov . , female: A—idiosomal dorsum, B—idiosomal venter. FIGURE 6 . Petalomium kurganiensis sp. nov . , female: A—gnathosoma in dorsal view, B—gnathosoma and pharyngeal pumps in ventral view. FIGURE 7 . Petalomium kurganiensis sp. nov . , female: A—right leg I in dorsal view, B—right leg II in dorsal view. Type material . Female holotype , slide No. AK 130915 /1, RUSSIA : Kurgan Province, Zverinogolovskiy district, vicinity of settlement Ukrainets, 54°24ʹ11.6ʺN, 64°49ʹ08.6ʺE, on ants Lasius umbratus , 13 September 2015 , coll. A.A. Khaustov; paratypes : 3 females , same data. Etymology . The name of a new species refers to the name of the Kurgan Province in Russia , where it was collected. Differential diagnosis . The new species is very similar to P. brevicaudus sp. nov . by smooth pseudanal setae and similar lengths of the idiosomal setae. It differs from P. brevicaudus sp. nov . by solenidion ω 2 being about two times shorter than ω 1 (vs. ω 2 slightly longer than ω 1 in P. brevicaudus sp. nov . ), setae ps 1 and ps 2 subequal (vs. ps 1 distinctly longer than ps 2 in brevicaudus sp. nov . ) and setae h 2 distinctly shorter than h 1 (vs. h 2 and h 1 subequal in brevicaudus sp. nov . ).