Stigmaeus mitrofanovi Khaustov

Khaustov, Alexander A., 2014, New species and new records of mites of the genus Stigmaeus (Acari: Prostigmata: Stigmaeidae) from Crimea, Zootaxa 3794 (2), pp. 237-253 : 238-241

Stigmaeus mitrofanovi Khaustov sp. nov.

( Figs. 1–9 , 26–28 )

Description. FEMALE. Length of idiosoma 605, width 405. Idiosomal dorsum ( Fig. 1 ). Central plate with 2 pairs of setae c 1 and d 1; intercalary plates paired. All plates coarsely reticulated; Postocular bodies very large, with weak reticulate pattern ( Fig. 26 ). Eyes absent. Striation anterolateral to propodosomal plate with microtubercles ( Fig. 27 ). Setae ve, sce, c 2, d 2, and e 2 conspicuously longer than others, smooth and pointed. Other dorsal setae distinctly blunt-ended and barbed in distal half. Ratio ve/sci = 2.5. Length of dorsal setae: vi 69, ve 157, sci 62, sce 128, c 1 68, c 2 154, d 1 67, d 2 143, e 1 66, e 2 160, f 1 94, h 1 76, h 2 77. Distances between setae: vi-vi 36, ve-ve 75, sci-sci 190, c 1 - c 1 91, d 1 -d 1 93, h 1 -h 1 61, h 1 -h 2 49. Idiosomal venter ( Fig. 2 ). All ventral plates reticulated. All ventral setae smooth and pointed, except for h 1 which is blunt-ended and barbed in distal half. Aggenital plate with 3 pairs of aggenital setae. One pair of genital setae. Length of ventral setae: 1 a 35, 1 b 28, 1 c 67, 2 b 67, 2 c 65, 3 a 30, 3 b 30, 3 c 29, 4 a 33, 4 b 28, 4 c 29, ag 1 38, ag 2 32, ag 3 50, g 23, ps 1 56, ps 2 44, ps 3 43. Gnathosoma ( Figs. 3–5 ). Tibial claw large. Setae l’ on palpal tibia spine-like ( Fig. 4 ). Setae d and l’ on palpal femur distinctly blunt-ended and barbed in distal half. Number of setae on palpal segments: Tr 0, Fe 3 (d, l’, v”), Ge 2 (d, l”), Ti 3 (d, l’, l”), Ta 8(1) (fused eupathidia ul’, ul”, sul, eupathidion acm, ba, bp, lp, 1 solenidion ω). Palpal supracoxal setae (elcp) seta-like ( Fig. 28 ). Rostrum of subcapitulum ( Fig. 5 ) relatively short and wide. Subcapitular setae smooth and pointed. Basal part of subcapitulum without distinct reticulation. Length of subcapitular setae: m 27, n 31, or 1 26, or 2 36. Legs ( Figs. 6–9 ). All legs with a pair of well developed claws. Empodial raylets pointed. Leg segments with weak reticulation. Leg I ( Fig. 6 ). Coxae I posterodorsally with seta-like leg supracoxal setae (elcl). Leg chaetotaxy: Tr 1 (v’), Fe 6 (d, l’, l”, v’, v”, bv”), Ge 4 (d, l’, l”, k), Ti 5(2) (d, l’, l”, v’, v”, φ, φp), Ta 13(1) (p’, p”, tc’, tc”, ft ’, ft”, u’, u”, a’, a”, pl’, pl”, vs, ω). Setae d on tibia and (p), (tc), (ft) on tarsus are eupathidia. Setae l’, l” on tibia, l’, l”, d on genu, l’, l”, d, v’ on femur blunt-ended and distinctly barbed in distal half. Seta d (54) on genu distinctly longer than seta k (34). Solenidion ω relatively short (17), finger-shaped; solenidion φ (14) baculiform, φp attenuate (23). Leg II ( Fig. 7 ). Leg chaetotaxy: Tr 1 (v’), Fe 5 (d, l’, l”, v’, bv”), Ge 4 (d, l’, l”, k), Ti 5(1) (d, l’, l”, v’, v”, φ), Ta 9(1) (p’, tc’, tc”, u’, u”, a’, a”, pl’, vs, ω). Setae d on tibia, p’ and tc’ on tarsus are eupsthidia. Setae l” on tibia, d, l’, l” on genu, d, l” on femur blunt-ended and distinctly barbed in distal half. Solenidion ω (15) finger-shaped; solenidion φ (22) attenuate. Seta k short (11), about 3 times shorter than setae d on genu. Leg III ( Fig. 8 ). Leg chaetotaxy: Tr 2 (v’, l’), Fe 3 (d, l’, ev’), Ge 1 (d), Ti 5(1) (d, l’, l”, v’, v”, φ), Ta 7(1) (tc’, tc”, u’, u”, a’, a”, vs, ω). Solenidion ω (9) fingershaped; solenidion φ (20) attenuate. Setae d on genu, d and l’ on femur blunt-ended and distinctly barbed. Leg IV ( Fig. 9 ). Leg chaetotaxy: Tr 1 (v’), Fe 2 (d, ev’), Ge 1 (d), Ti 5(1) (d, l’, l”, v’, v”, φ), Ta 7(1) (tc’, tc”, u’, u”, a’, a”, vs, ω). Solenidion ω (10) finger-shaped; solenidion φ (24) attenuate. Setae l” on tibia, d on genu, and d on femur blunt-ended and distinctly barbed. Seta d on tibia long (148) and smooth, 2.5 times longer than l’ on tibia.

Type material. Female holotype, slide № AK 190897 , CRIMEA: Yalta mountain pasture, about 1200 m.a.s.l., in the galleries of bark beetle Pityogenes bistridentatus (Eichhoff) ( Coleoptera : Curculionidae ), under the bark of Pinus pallasiana D. Don. , 19 August 1997, coll. Khaustov A.A.

Etymology. The new species is named after V.I. Mitrofanov, a well-known acarologist from the Nikita Botanical Gardens, for his great contribution to acarology.

Differential diagnosis. The new species is most similar to S. glabrisetus Summers, 1962 by the presence of two setal pairs on the central plate, six and five setae on femora I and II, respectively, one pair of the genital setae, very large postocular bodies, anterolateral striae on the prodorsum with microtubercles, absence of eyes, and by seta-like supracoxal palpal and leg I setae. It differs from S. glabrisetus by very long, smooth and pointed setae sce and d 2, which are similar in the length and shape to ve, c 2, and e 2 and are 1.5–2 times longer than other dorsal idiosomal setae (vs. relatively short, blunt-ended with few barbs, subequal to setae c 1 and d 1 which are 1.5–2 times shorter than ve and c 2 in S. glabrisetus ), and by the reticulated postocular bodies (vs. non-reticulated in S. glabrisetus ).

Figures

FIGURES 1 – 2. Stigmaeus mitrofanovi Khaustov sp. nov., female: 1 — idiosomal dorsum, 2 — idiosomal venter.

FIGURES 3 – 6. Stigmaeus mitrofanovi Khaustov sp. nov., female: 3 — gnathosoma dorsally, 4 — tibia and tarsus of palp, 5 — subcapitulum, 6 — leg I.

FIGURES 7 – 9. Stigmaeus mitrofanovi Khaustov sp. nov., female: 7 – 9 — legs II – IV, respectively.

FIGURES 26 – 32. Stigmaeus mitrofanovi Khaustov sp. nov., female: 26 — postocular body, 27 — anterolateral part of prodorsum showing striae with microtubercles, 28 — palpal supracoxal seta (elcp); Stigmaeus kuznetsovi Khaustov sp. nov., female: 29 — postocular body; Stigmaeus silvestris Khaustov sp. nov., female: 30 — postocular body, 31 — lateral part of prodorsum, 32 — subcapitulum.