Sidorchukdispus ekaterinae sp. nov.

(Figs 1–8)

Description. FEMALE (Figs 1–8). Length of idiosoma 150 (140–160), width 80 (80–85).

Gnathosoma (Figs 2, 5, 6E, F, 7C). Length of gnathosoma 16 (16–18), width 15 (14–15). Dorsal median apodeme absent. Length of cheliceral stylets: 12 (11–13). All gnathosomal setae needle-like and smooth. Lengths of gnathosomal setae cha 5 (5), chb 5 (5), pp 3 (3), m 6 (5–6), dFe 4 (4), dGe 5 (4–5). Pharyngeal pumps as in figure 2.

Idiosomal dorsum (Figs 1A, 6 A–D). Stigmata elongate, located dorsolaterally and covered by lateral flanges of prodorsum. Tergites C, D, EF and lateral plates with distinct scale-like sculpture (Figs 6 A–C). All dorsal setae slightly thickened, weakly blunt-ended. Setae sc 2 and c 1 smooth, setae d and f with two minute barbs near the base, other setae distinctly barbed. Trichobothria with long stem, clavate, sparsely barbed, with rounded apex. Tiny round pits (probably remnants of alveoli of setae v 2) located anterolaterally to bases of setae sc 2. Lengths of dorsal setae: sc 2 25 (24–27), c 1 29 (27–29), c 2 17 (16–23), d 29 (27–29), e 25 (23–25), f 29 (28–31), h 1 28 (28–30), h 2 34 (33–34). Distances between setae: sc 2 –sc 2 19 (19–20), c 1 – c 1 32 (29–32), c 1 – c 2 12 (12–13), d–d 21 (18–23), e–f 16 (14–17), f–f 20 (20–24), h 1 – h 1 9 (8–9), h 1 – h 2 10 (10–11).

Idiosomal venter (Figs 1B, 7A, B). Aggenital and posterior part of posterior sternal plates with scale-like microsculpture. All ventral setae pointed. Setae 1 b, ps 1, and ps 3 distinctly barbed, other ventral setae smooth. Lateral plates with several oblique sclerotized lines laterally to legs III–IV. Posterior margin of aggenital plate evenly rounded. Lengths of ventral setae: 1 a 17 (17–19), 1 b 17 (17–20), 2 a 25 (24–27), 2 b 22 (21–23), 3 a 19 (18–21), 3 b 23 (21–23), 3 c 18 (17–18), 4 a 25 (24–26), 4 b 30 (28–31), 4 c 25 (24–26), ps 1 22 (21–23), ps 3 19 (19–20).

Legs (Figs 3, 4, 7 D-F). Leg I (Fig. 3A). Lengths of solenidia ω 1 8 (8–9), φ 1 5 (5), φ 2 7 (7–8); ω 1 large, fingershaped, φ 1 clavate, φ 2 baculiform. Setae v’ of trochanter, v” of femur, l” of genu, k, pl” and (pv) of tibiotarsus smooth; other setae (except eupathidia) barbed. Setae l’ of femur and (l) of genu blunt-ended; other setae (except eupathidia) pointed. Leg II (Figs 3B, 7E). Solenidion ω 5 (5) prominent, finger-shaped, solenidion φ 3 (3) (Fig. 7E) weakly clavate, located in depression. Setae d of femur and tibia weakly blunt-ended, other setae pointed. Setae v’ of trochanter, l’, v” of femur, v’ of genu, l’ of tibia, pl”, tc” and pv” of tarsus smooth; other setae barbed. Seta v” of femur very small, 1–2 long. Leg III (Figs 4A, 7F). Solenidion ω 5 (5) prominent, finger-shaped, solenidion φ 2 (2) weakly clavate, located in depression (Fig. 7F). Seta d of femur weakly blunt-ended, other setae pointed. Setae tc’ and pv” of tarsus smooth; other setae barbed. Leg IV (Fig. 4B). Setae v” of tibia and tc’ of tarsus smooth, other setae barbed. Seta v’ of trochanter, d of femur and tibia blunt-ended, other setae pointed. Tibia IV without solenidia, but with pore-like structure visible on its typical insertion point.

Type material. Female holotype, slide VK 161018, South Africa, North West Province, near Potchefstroom, Faan Meintjes Nature Reserve, 26°42’S 26°42’E, on termites Trinervitermes trinervoides (Sjöstedt), 16 October 2018, collected by V.A. Khaustov, S.G. Ermilov ; paratypes: 36 females, same data .

Type deposition. The holotype and 10 paratypes are deposited in the acarological collection of the National Museum, Bloemfontein, South Africa (NMBS), other paratypes are deposited in the mite collection of the Tyumen State University Museum of Zoology, Tyumen, Russia (TSUMZ)— Zhang (2018). Etymology. The new species is named after the late Dr Ekaterina Sidorchuk.