Allopygmephorus spinisetus, Khaustov, Alexander A. & Sazhnev, Alexey S., 2016

Khaustov, Alexander A. & Sazhnev, Alexey S., 2016, Mites of the families Neopygmephoridae and Scutacaridae associated with variegated mud-loving beetles (Coleoptera: Heteroceridae) from Russia and Kazakhstan, Zootaxa 4175 (3), pp. 261-273 : 264-267

Allopygmephorus spinisetus sp. nov.

( Figs 4–6 )

Description. FEMALE ( Figs 4–6 ). Body well sclerotized. Length of idiosoma 240 (220–270), width 170 (165– 180). Gnathosoma similar to that of P. heteroceri sp. nov. Idiosomal dorsum ( Fig. 4 A). Only posterior part of prodorsum covered by anterior margin of tergite C. All dorsal plates with numerous small dimples (punctate).

Stigmata round, with transverse slit-like opening. Trichobothria clavate and weakly barbed. Setae sc 2 smooth, needle-like; setae c 1 and c 2 smooth or with 1-2 small barbs, pointed; setae d and f sparsely barbed, pointed; other dorsal setae blunt-ended and sparsely barbed. Posterior margin of tergite H rounded. Cupules ia on tergite D and ih on tergite H small, round. Tergite C with one pair of pore-like structures situated anteromedially to c 1. Lengths of dorsal setae: sc 2 15 (15–16), c 1 37 (36–43), c 2 44 (43–46), d 34 (34–39), e 22 (21–23), f 42 (41–44), h 1 28 (27–31), h 2 28 (27–29). Distances between setae: sc 2 –sc 2 53 (53–54), c 1– c 1 61 (59–63), c 1– c 2 37 (36–38), d–d 26 (26–36), e– f 17 (14–17), f–f 68 (66–73), h 1– h 1 28 (27–32), h 1– h 2 18 (17–19). Idiosomal venter ( Fig. 4 B). All ventral plates with numerous small dimples. Setae 1 b thichened, lanceolate and barbed. Setae ps 2 very small, vestigial; other ventral setae sparsely barbed, pointed. Setae ps 1 and ps 3 weakly thickened in basal part. Ap1 well-developed and joined with appr; ap2 well-developed, 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 concave in middle part. Posterior margin of aggenital plate rounded. Ags small, triangular, pgs large, triangular. Posterior sternal plate with distinct scale-like structure posteriorly and laterally to bases of legs IV. Lengths of ventral setae: 1 a 29 (28–30), 1 b 27 (25–28), 2 a 32 (31–34), 2 b 29 (28–32), 3 a 33 (32–35), 3 b 37 (35–38), 3 c 32 (30–33), 4 a 47 (45–49), 4 b 56 (53–58), 4 c 40 (38–42), ps 1 27 (25–28), ps 3 26 (24–28). Legs ( Figs 5 , 6 ). Leg setation as in P. heteroceri sp. nov. Leg I ( Fig. 5 A). Tip of tarsal claw thin, pointed. Seta k smooth, pointed. Seta l’ of femur smooth, blunt-ended; v” of femur I smooth, spiniform; other leg setae (except eupathidia) pointed and sparsely barbed. Lengths of solenidia ω 1 10 (10–11)> ω 2 4 (4) <φ 1 7 (7–8)> φ 2 6 (6–7); ω 1 finger-shaped, ω 2 and φ 2 baculiform, φ 1 weakly clavate. Leg II ( Fig. 5 B). Solenidion ω 13 (13–15), finger-shaped, solenidion φ 6 (5–6) weakly clavate. Seta v” of femur spiniform, smooth, tc” of tarsus smooth, pointed; u’ weakly blunt-ended, barbed; other leg setae pointed and sparsely barbed. Leg III ( Fig. 6 A) Solenidion φ 5 (4–5) weakly clavate. Setae pv’, tc’ and tc” of tarsus smooth, pointed; u’ weakly blunt-ended, barbed; other leg setae pointed and sparsely barbed. Leg IV ( Fig. 6 B). Solenidion φ 2 (2) very small. Setae u’ smooth; other leg setae barbed; setae v’ and v” of tibia bluntended, other leg setae pointed.

MALE and LARVA unknown.

Type material. Female holotype, slide No. 250703 /1, RUSSIA: Moscow Province, Zverinogolovsk region, vicinity of settlement Kubinka , on Heterocerus fenestratus , 25 July 2003, coll. I.M. Vyshinsky ; paratypes: nine females, same data; one female, Tver Province, Bezhetsk region, vicinity of settlement Drutskovo , on Heterocerus fenestratus , 2 September 2004, coll. I.M. Vyshinsky .

Etymology. The name of the new species is combined from Latin words spina meaning spine and seta referring to presence of spiniform seta v” on femur II.

Differential diagnosis. The new species is most similar to A. matthesi ( Krczal, 1959) , by having blunt-ended setae e, h 1, h 2, and pointed f. It differs from A. matthesi by its spiniform seta v” on femur II (not modified in A. matthesi ), and setae 1 b thickened and lanceolate (not thickened in A. matthesi ).

Figures

FIGURE 4. Allopygmephorus spinisetus sp. nov., female: A—idiosomal dorsum, B—idiosomal venter.

FIGURE 5. Allopygmephorus spinisetus sp. nov., female: A—right leg I in dorsal view, B—right leg II in dorsal view.

FIGURE 6. Allopygmephorus spinisetus sp. nov., female: A—right leg III in dorsal view, B—right leg IV in dorsal view.