Tydeus electus Kuznetzov, 1973

Ahmad-Hosseini, Mohammad, Khanjani, Mohammad & Karamian, Roya, 2019, Study on predatory mites of Aceria tristriatus (Nalepa, 1890) from Hamedan and Lorestan provinces, Western Iran, Persian Journal of Acarology 8 (2), pp. 125-145 : 135-137

Tydeus electus Kuznetzov, 1973

Diagnosis (female)

All dorsal setae are similar in shape, somewhat serrated and long (especially setae on end of opisthosoma). Trichobothrium seta (bo) is shorter than opisthosomal setae. Genital with 6 setae. Length of palpal tarsus equal to cheliceral stilettos, eupathidium on palp tarsus straight, solenidion

ωI short and very shorter than half of distance between tc -ft and also shorter than half of width of tarsus I.

Female ( Figs. 20–22 )

Body circular to oval shape 400–435 length (excluding gnathosoma), width 270–295 (at level of seta c2).

Dorsum – Completely striated with 13 pairs of setae ( Fig. 20 ), dorsal striation approximately similar to Tydeus caryae . Length of dorsal setae: bo 36–39, ro 26–29, la 27–30, ex 35–39, c1 25– 29, c2 36–39, d1 27–30, e1 35 –38, f1 37–40, f2 41–43, h1 33–36, h2 33–37, ps1 25–27. Distances between dorsal setae: ro -ro 28–31, la -la 123–131, bo -bo 75–80, c1-c1 76–82, c2-c2 235–246, d1-d1 54–58, e1-e1 137–146, f1-f1 43–48, f2-f2 103–112, h1-h1 28–32, h2-h2 61–66, ps1-ps1 25–29.

Venter – Ventral cuticle and coxisternal shields striated. Lengths of ventral setae: 1b 26–28, 1c 24–26, 2a 23–25, 3b 24–25, 3c 24–27, 3d 28–31, 4b 24–25, pt 25–27, mtα 17–19, mtβ 16–18, ag1 15–16, ag2 16–17, ag3 15–17, ag4 17–18, ps3 21–24.

Gnathosoma – Not visible completely from above. Palpal femur-genu: length 29–30, width 12. Palp distally with eupathidium (pζ) straight, 7 long. Palp chaetotaxy (6+ ω –1–2) ( Fig. 21 ). Length of cheliceral stiletto equal to palpal tarsus, 18.

Legs – Measurements from trochanter to tarsus (excluding pretarsus): leg I 195–203; leg II 192–197; leg III 196–199, leg IV 222–231; Shape of cg (coxal organ) oval. Measurements: tarsus + apotele I length/width: 64/13. Length of setae on tarsus I: ft’ζ 18–20, ft”ζ 33–36, tc’ζ 18–19, tc”ζ 25–28, ωI 5 ( Fig. 22 ). Tarsus II with club-like solenidion ωII 2 long.

Remarks

This re-description resembles the original description by Kuznetzov (1973) in most respects, but in original description length of seta f1 nearly as long as distance f1-h1, while in this study length of f1 clearly shorter than f1-h1.

Material examined

Hamedan province: Heydareh village – 20 Oct. 2016 (n = 2) ; Ganjnameh – 1 Nov. 2015 (n = 3) . Lorestan province: Aleshtar county – 14 Sep. 2015 (n = 2).

Figures

Figures 20–22. Tydeus electus (Kuznetzov, 1973) (Adult female) – 20. Dorsal view of idiosoma; 21. Palp; 22. Leg I.