Troxodania magnifica Khaustov and Trach

Khaustov, Alexandr A. & Trach, Viacheslav A., 2014, Mites of the superfamily Pygmephoroidea (Acari: Heterostigmata: Neopygmephoridae, Pygmephoridae) associated with Trox cadaverinus (Coleoptera: Trogidae) from the Far East of Russia, with description of a new genus and two new species, Zootaxa 3754 (1) : -

Troxodania magnifica Khaustov and Trach sp. nov.

( Figs. 1–6 )

Description. FEMALE. Idiosomal length: 374 (357–380), maximum width 216 (210–218). Gnathosoma ( Figs. 1– 2 ). Cheliceral setae chb distinctly longer than cha, pointed. Palpal setae dGe distinctly longer than dFe. Posterior margin of gnathosomal ventral capsule deeply concave. Pair of round pits situated posteromedially to ventral setae m. Accessory setigenous structure relatively small.

Idiosomal dorsum ( Fig. 1 ). Stigmata situated anterolaterally on prodorsum. Prodorsum very large and well sclerotized, dark brown in color. Trichobothrium with thin stem, distally spherical, with pointed tip, barbed. All tergites with numerous small dimples. All dorsal setae barbed. All dorsal setae blunt ended, except pointed c 2. Distance between bases of setae h 1 subequal between bases of h 2. Length of dorsal setae: v 2 22 (19–27), sc 2 103 (102–108), c 1 109 (107–126), c 2 129 (125–130), d 118 (117–129), e 61 (55–63), f 155 (153–164), h 1 135 (116–138), h 2 107 (100–109). Distances between dorsal setae: v 2–v2 100 (94–102), sc 2– sc 2 72 (70–74), c 1– c 1 97 (94–98), c 1– c 2 42 (36–43), d–d 140 (136–142), e–f 18 (17–19), f–f 141 (132–142), h 1– h 1 113 (110–115), h 2– h 2 105 (100–107).

Idiosomal venter ( Fig. 2 ). Setae 1 b, 2 b and pseudanal setae barbed, pointed, all other setae with distinctly thickened basal part, smooth.. Anterior sternal plate smooth. Other ventral plates with numerous small dimples. Apodemes 1 (ap1) extremely large, dark brown in color, diffuse, not joined with appr, ap2 relatively thin, joined with appr; sejugal apodeme (apsej) very large, strongly sclerotized; secondary transverse apodeme (sta) well developed; ap3 relatively long, well sclerotized. Ap4 well sclerotized, broken medially and joined with poststernal apodeme (appo). Posterior margin of posterior sternal plate slightly convex medially. Posterior margin of aggenital plate almost straight. Length of ventral setae: 1 a 50 (47–52), 1 b 61 (58–62), 2 a 52 (50–53), 2 b 76 (71–77), 3 a 44 (43–57), 3 b 52 (47–53), 3 c 56 (44–57), 4 a 47 (44–48), 4 b 68 (57–69), 4 c 61 (57–63), ps 1 55 (47–56), ps 2 55 (50– 56), ps 3 56 (51–57).

Legs ( Figs. 3–6 ). Leg I ( Fig. 3 ). Solenidion ω 1 10 (8–10) finger-shaped, solenidia ω 2 13 (13–14) and φ 2 11 (10– 11) baculiform. Solenidion φ 1 9 (8–9) clavate. Setae l’GeI blunt-ended. Leg II ( Fig. 4 ). Solenidion ω 13 (11–13) finger-shaped, solenidion φ 4 (4–5) very small, weakly clavate. Setae dFeII blunt ended. Leg III ( Fig. 5 .). Solenidion φ 4 (4–5) very small, weakly clavate. Setae dFeIII blunt ended. Leg IV ( Fig. 6 ). Setae v”TiIV bluntended, solenidion φ 5 (5–6) prominent, baculiform.

Type material. Female holotype, slide № VT 220890, RUSSIA: Far East, Primorye, ca. 50 km SWW Vladivostok, ca. 10 km NW Slavyanka, Bamburovo vill., from a single specimen of Trox cadaverinus Illiger attracting to a light trap, 22 July 1990, coll. Napolov A. (beetle), Trach V.A. (mites); 7 female paratypes with same data as holotype.

Type depositories. Holotype and most of paratypes deposited at the collection of the Nikita Botanical Gardens—National Scientific Centre, Yalta, Ukraine; 2 paratype at the collection of the Zoological Museum of I.I. Mechnikov Odessa National University, Ukraine.

Etymology. The name of the new species refers to relatively large body size of females.

Differential diagnosis. The new species is most similar to Troxodania decumanus ( Krczal, 1959) comb. nov., but easily differs by modified setae 1 a, 1 b, and all setae of the posterior sternal plate (not modified in T. decumanus ), and by extremely large (more than a half of the prodorsum length) and diffuse ap1 and prodorsum (well sclerotized and less than third part of prodorsum length in T. decumanus ).

Figures

FIGURES 1 – 2. Troxodania magnifica Khaustov and Trach sp. nov., female: 1 — dorsum, 2 — venter.

FIGURES 3 – 4. Troxodania magnifica Khaustov and Trach sp. nov., female: 3 – 4 — legs I – IV, respectively.

FIGURES 5 – 6. Troxodania magnifica Khaustov and Trach sp. nov., female: 5 – 6 — legs I – IV, respectively.