Stigmaeus kuznetsovi 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 : 241-243

Stigmaeus kuznetsovi Khaustov sp. nov.

( Figs. 10–17 , 29 )

Description. FEMALE. Length of idiosoma 430 (420–450), width 297(300–320). The chaetotaxy of body and legs as in S. mitrofanovi sp. nov. Idiosomal dorsum ( Fig. 10 ). Central plate with 2 pairs of setae c 1 and d 1; intercalary plates paired. All plates coarsely reticulated; Postocular bodies of medium size, smooth ( Fig. 29 ). Eyes absent. Striation anterolateral to propodosomal plate without microtubercles. All dorsal setae barbed. Setae ve, sce, and c 2, longer than others and pointed. Other dorsal setae distinctly blunt-ended and barbed in distal half. Setae e 2 distinctly longer than d 2, and only slightly shorter than sce and c 2. Ratio ve/sci = 2.0. Length of dorsal setae: vi 74, ve 106, sci 51, sce 96, c 1 61, c 2 97, d 1 61, d 2 67, e 1 56, e 2 89, f 1 79, h 1 68, h 2 69. Distances between setae: vi-vi 25, veve 69, sci-sci 122, c 1 -c 1 80, d 1 -d 1 80, h 1 -h 1 46, h 1 -h 2 33.

Idiosomal venter ( Fig. 11 ). All ventral plates without reticulation. All ventral setae pointed, except for h 1 which is blunt-ended and strongly barbed in distal half; setae ag 3, ps 2, and ps 3 barbed, other ventral setae smooth. Length of ventral setae: 1 a 25, 1 b 28, 1 c 44, 2 b 43, 2 c 42, 3 a 31, 3 b 30, 3 c 23, 4 a 25, 4 b 27, 4 c 27, ag 1 23, ag 2 29, ag 3 36, g 19, ps 1 45, ps 2 30, ps 3 30.

Gnathosoma ( Figs. 12–13 ). Tibial claw large. All setae on femur, genu and tibia of palps are pointed, except for spine-like l’ on palpal tibia ( Fig. 12 ). Palpal supracoxal setae (elcp) peg-like. Rostrum of subcapitulum ( Fig. 13 ) relatively short and wide. Subcapitular setae smooth and pointed. Basal part of subcapitulum without distinct reticulation. Length of subcapitular setae: m 33, n 29, or 1 19, or 2 29.Legs ( Figs. 14–17 ). Empodial raylets pointed. Leg segments without reticulation. Leg I ( Fig. 14 ). Coxae I posterodorsally with peg-like leg supracoxal setae (elcl). Setae l”, d on genu and l”, d on femur blunt-ended and distinctly barbed in distal half. Seta d (47) on genu subequal to seta k (46). Solenidion ω relatively short (23), finger-shaped; solenidion φ (15) baculiform, φp attenuate (22). Leg II ( Fig. 15 ). Setae d on genu and d, l” on femur blunt-ended and distinctly barbed in distal half. Solenidion ω (22) finger-shaped; solenidion φ (24) attenuate. Seta k short (10), about 4 times shorter than setae d on genu. Leg III ( Fig. 16 ). Solenidion ω (13) finger-shaped; solenidion φ (19) attenuate. Setae d and l’ on femur blunt-ended and distinctly barbed. Leg IV ( Fig. 17 ). Solenidion ω (12) finger-shaped; solenidion φ (18) attenuate. Setae d on genu and d on femur blunt-ended and distinctly barbed. Seta d on tibia of medium length (65) and barbed, 1.4 times longer than l’ on tibia.

Type material. Female holotype, slide № AK 090495, and 2 female paratypes, CRIMEA: Yalta mountain pasture, about 1200 m.a.s.l., from nest of Microtus socialis (Pallas) ( Rodentia : Cricetidae ), 9 April 1995, coll. Khaustov A.A..

Etymology. The new species is named after the late well-known acarologist Prof. N.N. Kuznetsov for his great contribution to acarology.

Differential diagnosis. The new species is most similar to S. siculus ( Berlese, 1883) by the presence of two pairs of setae on the central plate, six and five setae on femora I and II, respectively, one pair of the genital setae, medium size postocular bodies, anterolateral striae on the prodorsum without microtubercles, peg-like supracoxal palpal and leg I setae, and by the absence of eyes. It differs from S. siculus by setae sce similar in shape and length to ve and c 2, and about 1.5–2 times longer than other dorsal idiosomal setae (vs. relatively short, blunt-ended, distinctly barbed in distal half, similar in shape and length to setae c 1 and d 1 which are 1.5–2 times shorter than ve and c 2 in S. siculus ); the new species also differs by having setae e 2 distinctly longer than d 2 and only slightly shorter than c 2 (vs. setae e 2 are subequal to d 2 and about 1.5 times shorter than c 2 in S. siculus ).

Figures

FIGURES 10 – 11. Stigmaeus kuznetsovi Khaustov sp. nov., female: 10 — idiosomal dorsum, 11 — opisthosomal venter.

FIGURES 12 – 13. Stigmaeus kuznetsovi Khaustov sp. nov., female: 12 – gnathosoma dorsally, 13 — subcapitulum.

FIGURES 14 – 15. Stigmaeus kuznetsovi Khaustov sp. nov., female: 14 – 15 – legs I – II, respectively.

FIGURES 16 – 17. Stigmaeus kuznetsovi Khaustov sp. nov., female: 16 – 17 – legs III – 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.