Pseudopygmephorus peritrematus ( Mahunka, 1979 )

Khaustov, Alexander A. & Frolov, Andrey V., 2018, A new species, new genus and new records of heterostigmatic mites (Acari: Heterostigmata) phoretic on scarab beetles of the subfamily Orphninae (Coleoptera: Scarabaeidae), Zootaxa 4514 (2), pp. 181-201 : 190-192

Pseudopygmephorus peritrematus ( Mahunka, 1979)

( Figs 11–15 )

Bakerdania peritremata Mahunka, 1979, p. 147 , Figs 14 A-G.

Pseudopygmephorus peritrematus: Khaustov 2010, p. 262 .

Redescription. FEMALE ( Figs 11–15 ). Length of idiosoma 180–205, width 115–125.

Gnathosoma ( Fig. 12 ). Gnathosomal capsule almost round in outline, length 22, width 21. Dorsum with two pairs of cheliceral setae cha 8 and chb 16. Setae chb weakly barbed, other gnathosomal setae smooth. Setae cha, dFe and pp blunt-ended, other gnathosomal setae pointed. Dorsal median apodeme present, weakly developed. Postpalpal setae (pp) situated anterolaterally to setae cha. Ventral gnathosoma with one pair of setae m 7 and round pits situated posteriorly to m. Palpi with setae dFe and dGe dorsolaterally; setae dGe distinctly longer than dFe. Palpi ventrally each with mushroom-like ass and small solenidion laterally to ass. Palpi terminated with small tibial claw and tiny eupathidium-like seta; palpal tibiotarsus usually completely covered by anterior part of femorogenu. Pharyngeal pumps separated, transversely striated; pharyngeal pump 1 small, butterfly-like, situated inside gnathosoma; pharyngeal pumps 2 and 3 oval, pump 3 slightly larger than pump 2.

Idiosomal dorsum ( Figs 11A , 15A ). Only posterior part of prodorsum covered by anterior part of tergite C. All dorsal shields with numerous tiny, barely discernable dimples ( Fig. 15A ). Prodorsal shield with two pair of setae (v 2, sc 2), one pair of weakly barbed capitate trichobothria and one pair of elongate and constricted in central part stigmata ( Fig. 15A ); trichobothria with delicate longitudinal striation in distal half. Stigmata associated with well developed tracheal trunks. Setae v 2 smooth, other dorsal setae barbed. Setae v 2 needle-like and stiff, setae sc 2, c 2 e and h 1 pointed, other dorsal setae blunt-ended. Cupules ia on tergite D and ih on tergite H small, round. Posterior margin of tergite H with short tongue-like median projection. Lengths of dorsal setae: v 2 11–14, sc 2 41–45, c 1 26– 28, c 2 45–48, d 30–34, e 27–33, f 39–44, h 1 40–46, h 2 23–24. Distances between setae: v 2 –v 2 28–30, sc 2 –sc 2 24–26, c 1 – c 1 37–40, c 1 – c 2 22–25, d–d 42–46, e–f 9–12, f–f 40–42, h 1 – h 1 23–26, h 1 – h 2 15–17.

Idiosomal venter ( Figs 11B , 15B, C ). All ventral plates with numerous tiny dimples ( Fig. 15B ). Setae ps 3 bluntended, other ventral setae pointed. Setae 1 b thickened and flattened. Setae 3 a, 3 c, 4 a, 4 c smooth, other ventral setae barbed. Ap1, ap2 and apsej well developed and joined with appr; ap3 indistinct; ap4 well developed, reaching to bases of setae 3 b. Apodemes 5 absent. Ags bell-like, pgs large, elongate-triangular, mgs small, oval. Posterior margin of posterior sternal plate tripartite. Posterior margin of aggenital plate rounded. Setae ps 2 absent ( Fig. 15C ). Lengths of ventral setae: 1 a 21–24, 1 b 21–22, 2 a 27–32, 2 b 25–27, 3 a 24–25, 3 b 23–26, 3 c 18–21, 4 a 23–27, 4 b 31–36, 4 c 24–28, ps 1 20–21, ps 3 15–16.

Legs ( Figs 13 , 14 ). Leg I ( Fig. 13A ) distinctly thicker than leg II. Setal formula: 1–3–4–16 (4). Tibiotarsus enlarged, with massive blunt-ended claw. Setae tc’ and tc” situated on short and wide pinnaculum. Solenidion ω 1 completely fused with tibiotarsus forming sensory pit, other solenidia weakly clavate. Lengths of solenidia ω 1 10– 11, ω 2 5–6, φ 1 9, φ 2 5–6. Seta d of femur hook-like; seta pl’ of tarsus smooth and attenuated, other setae (except eupathidia) pointed and barbed. Leg II ( Fig.13B ). Setal formula: 1–3–3–4(1)–6(1). Tarsus with thickened padded claws and flipper-like empodium. Solenidia ω 7 and φ 4 clavate. Seta tc” of tarsus smooth, other setae barbed; seta u’ of tarsus blunt-ended, other setae pointed. Leg III ( Fig. 14A ). Femur divided into basi- and telofemur. Setal formula: 1–2–2–4(1)–6. Claws and empodium of same shape as on tarsus II. Solenidia φ 4 weakly clavate Seta tc” of tarsus smooth, other setae barbed; setae d of femur and u’ of tarsus blunt-ended, other setae pointed. Leg IV ( Fig 14B ). Femur divided into basi- and telofemur. Setal formula: 1–2–1–4(1)–6. Claws simple, hooked, empodium slightly smaller than on tarsi II and III. Solenidion φ 4 weakly clavate. All setae barbed. Setae d of femur and v” of tibia blunt-ended, other setae pointed.

MALE and LARVA unknown.

Material examined. BURKINA FASO: 11 females on Orphnus macleayi Laporte de Castelnau and 1 female on Orphnus subfoveatus Fairmaire, Ouagadougou , 6.VI.1927, G. Olsoufieff leg.

Remarks. Pseudopygmephorus peritrematus ( Mahunka, 1979) was described from South Africa ( Mahunka 1979). Examined specimens from Burkina Faso matched the original description of P. peritrematus and are undoubtedly conspecific with it.

Figures

FIGURE 11. Pseudopygmephorus peritrematus (Mahunka, 1979), female: A—dorsum of the body, B—venter of the body. Legs omitted.

FIGURE 12. Pseudopygmephorus peritrematus (Mahunka, 1979), female: A—gnathosoma in dorsal view, B—gnathosoma and pharyngeal pumps in ventral view.

FIGURE 13. Pseudopygmephorus peritrematus (Mahunka, 1979), female: A—left leg I in dorsal view, B—left leg II in dorsal view.

FIGURE 14. Pseudopygmephorus peritrematus (Mahunka, 1979), female: A—left leg III in dorsal view, B—left leg IV in dorsal view.

FIGURE 15. DIC micrographs of Pseudopygmephorus peritrematus (Mahunka, 1979), female: A—prodorsum, B—anterior part of posterior sternal plate, C—pseudanal segment in ventral view.