Two new genera and two new species of the mite family Neopygmephoridae (Acari: Heterostigmata) associated with small mammals from USA Author Khaustov, Alexander A. Tyumen State University, Tyumen, Russia. Author Whitaker, John O. Jr. Director Emeritus, Center for Bat Research, Outreach, and Conservation, Department of Biology, text Acarologia 2019 2019-08-02 59 3 308 322 http://dx.doi.org/10.24349/acarologia/20194335 journal article 10.24349/acarologia/20194335 2107-7207 5173635 4CC238AE-261B-432A-901D-490635B60695 Theriadania venusta sp. nov. Zoobank: 728BAA7F-660C-455A-80A7-BA63F332DECA ( Figs 6–11 ) Description Female ( Figs 6–11 ) — With the character states of the genus as described above. Length of idiosoma 235 (220–225), width 155 (125–135). Gnathosoma ( Figs 7A, B ). Length of gnathosoma 26 (24–26), width 15 (14–15). Dorsal median apodeme absent. Cheliceral setae cha 17 (15–17) weakly barbed in basal part and pointed. Setae dFe located ventrolaterally, blunt-ended and distinctly shorter than dorsolateral pointed dGe . Subcapitular setae m 10 (10) Figure 7 Theriadania venusta sp. nov. , female: A – gnathosoma in dorsal view, B – gnathosoma and pharyngeal pumps in ventral view, C – anterior part of prodorsum. smooth and pointed. Php1 very small, smooth, distinctly separated from transversely striated subrectangular php2 and smooth oval php3, which is about three times shorter than php2 ( Fig. 7B ). Accessory setigenous structure ( ass ) rod-shaped. Idiosomal dorsum ( Figs 6A , 10A–C , 11A, B ). All dorsal shields with numerous small round dimples ( Figs 10A–C , 11A, B ). Anterior part of prodorsum with distinct sculpture lines forming polygonal cells ( Figs 7C , 11A ). Tergite C with three pairs of oval porous areas ( Fig 6A ). All dorsal setae pointed and distinctly barbed. Setae v 2 , e , h 1 , h 2 distinctly lanceolate. Setae sc 2 and f narrowly lanceolate; other dorsal setae long and slightly thickened. Trichobothria with long stem, clavate, sparsely barbed, with rounded apex. Cupules ia on tergite D situated laterally to bases of setae d ; cupules ih on tergite H situated anteriorly to bases of setae h 2 . Lengths of dorsal setae: v 2 13 (13–16), sc 2 50 (49–51), c 1 95 (90–98), c 2 115 (115–125), d 80 (74–83), e 37 (35–42), f 41 (43–48), h 1 Figure 8 Theriadania venusta sp. nov. , female: A – right leg I in dorsal view, B – right leg I in ventral view, C – right leg II in dorsal view, D – genu, tibia and tarsus of right leg II in ventral view. 23 (23–26), h 2 25 (25–26). Distances between setae: v 2 –v 2 39 (39–40), sc 2 –sc 2 33 (33–34), c 1 – c 1 10 (9–11), c 1 – c 2 39 (38–39), d–d 18 (16–18), e–f 18 (16–18), f –f 45 (47–48), h 1 – h 1 16 (16–17), h 1 – h 2 24 (24–25). Idiosomal venter ( Figs 6B , 10D–E ). Ventral plates with numerous small dimples ( Figs 10D–F ), dimples on anterior half of coxal fields II slightly larger than others ( Fig. 10D ). Lateral plates lateral to legs II and IV and lateral parts of aggenital plate with weak longitudinal striation ( Fig. 10F ). All ventral setae distinctly barbed and pointed. Posterior margin of aggenital plate straight. Setae 3 a , 3 b , 3 c located in transverse row. Lengths of ventral setae: a 1 41 (37–43), 1 b 25 (23–26), 2 a 32 (32–34), 2 b 47 (46–48), 3 a 48 (46–49), 3 b 60 (56–61), 3 c 35 (33–36), 4 a 75 (73–78), 4 b 85 (89–99), 4 c 66 (65–74), ps 1 13 (13–14), ps 2 12 (12–13), ps 3 14 (14–15). Legs ( Figs 8 , 9 , 11C ). Leg I ( Figs 8A , 11C ). Lengths of solenidia ω 1 11 (11), φ 1 9 (8–9), φ 2 4 (4); solenidion ω 1 finger-shaped, solenidion φ 1 baculiform, solenidion φ 2 clavate. Setae v’ of trochanter and pl () of tarsus slightly thickened basally, pointed and barbed; other leg setae (except eupathidia and u ) strongly barbed, flattened and widened with pointed tips. Leg II ( Fig. 8B ). Solenidia ω 9 (9) and φ 4 (4) finger-shaped. Seta tc” smooth, other leg setae distinctly barbed. Setae tc” and u’ not thickened; seta v’ of trochanter slightly thickened; other leg setae distinctly thickened and flattened; seta d of tibia distinctly bifurcate; seta l” of genu fan-shaped. Leg III ( Fig. 9A ). Solenidion φ 3 (3) weakly clavate. All leg setae pointed; seta tc” smooth, other leg setae distinctly barbed. Setae tc” and u’ not thickened, other leg setae distinctly thickened and flattened. Leg IV ( Fig. 9B ). Solenidion φ 2 (2–3) weakly clavate. All leg setae distinctly barbed. Seta v” of tibia weakly blunt-ended; other leg setae pointed. Male and larva unknown. Figure 9 Theriadania venusta sp. nov. , female: A – left leg III in dorsal view, B – left leg IV in dorsal view. Type material — Holotype (female) and 3 paratypes (females): USA , Texas , Culberson County , on Merriam’s kangaroo rat, Dipodomys merriami , 19 June 1976 ( J. Whitaker ). Type deposition — The holotype and 1 paratype are deposited in the United States National Museum , Washington , USA ; other paratypes are deposited in the mite collection of the Tyumen State University Museum of Zoology , Tyumen , Russia . Etymology — The name of the new species is derived from Latin venustus meaning beautiful, and refers to the presence of many modified setae on idiosoma and legs.