12. Yunkeracarus faini Hyland et Clark, 1959 (Figs. 68, 69) Yunkeracarus faini Hyland & Clark 1959: 365; Fain et al. 1967: 79; Smith et al. 1985: 481; Zabludovskaya 1989: 64, 1990: 35. Redescription. FEMALE (holotype). Body, including gnathosoma, 335 long (350) in one specimen), 200 wide (180). Propodonotal shield with widely rounded posterior margin, length 60 (62), maximum width 65 (65). Setae si 26 long (27), subequal to se 24 long (26). Distance se–se 65 (55), about 7 times greater than si– si, 9 (8). Bursa copulatrix opening dorsal. Sternum 22 long (19). Posterior projections of coxal fields I distinctly widened, 9 long (9) and 23 wide (26). Distance between distal ends of apodemes II about 30 (23). Two pair of weakly developed folds present ventrally on propodosoma posterior to coxal fields II. Distance 4a–4a 25 (30), 1.3–1.5 times greater than ps3–ps3, 16 (24). Alveoli of setae h1 and h3 absent. Legs III and IV subequal in length, 115 (105) and 130(120) long, respectively (excluding pretarsus). Setae cG I–II microspines, 2 long (in non-type specimen setae cG I filiform, 10 long). Setal lengths: 1a 13 (14), c3 15 (17), cp 27 (28), h2 120 (110), vF I 23 (18), vF II 27 (23), mG I 25 (23), mG II 28 (25), gTI–II 2–3, solenidia ϕI–II about 9, ω 1 I–II 9–10. MALE (1 specimen). Body, including gnathosoma, 315 long, 145 wide. Propodonotum as in female. Propodonotal shield 57 long, 60 maximum wide. Setae si 22 long, subequal to se, 20 long, respectively. Distance se–se 48, about 5 times greater than si–si, 9. Sternum 16 long. Posterior projections of coxal fields I distinctly widened, 10 long, 23 wide. Distance between distal ends of apodemes II 23. Two pairs of weakly developed folds present ventrally on propodosoma posterior to coxal fields II. Aedeagus very short 22 long, its posterior end far not reaching to level of setae 4a, distance between posterior end of aedeagus and level of setae g 13. Length and width of postgenital shield subequal, about 25. Distance g–g 18, 2 times greater than ps3–ps3, 9. Alveoli of setae h1 and h3 absent. Legs III and IV subequal in length, about 105 and 110 long, respectively (excluding pretarsus). Setae cG I–II microspines, about 2 long. Setal lengths: 1a 10, c3 12, cp 18, h2 85, vF I 20, vF II 22, mG I–II about 18, gT I–II about 2, solenidia ϕI–II 8, ω 1 I–II 10. Measurements of female specimens from Peromyscus mexicanus (3 specimens). Body, including gnathosoma, 310–330 long, 152–160 wide. Propodonotal shield with widely rounded posterior margin, length 40– 45, maximum width 50–55. Setae si 20–22 long, subequal to se 22–23 long. Distance se–se 50–57, 7 times greater than si–si, 7–8. Bursa copulatrix opening dorsal. Sternum about 18 long. Posterior projections of coxal fields I distinctly widened, about 9 long, 22 wide. Distance between distal ends of apodemes II about 25. Several weakly developed folds present ventrally on propodosoma posterior to coxal fields II. Distance 4a–4a 29–30, 1.7 times greater than ps3–ps3, 17–18. Alveoli of setae h1 and h3 absent. Legs III and IV subequal in length, about 105 and 120 long, respectively (excluding pretarsus). Setae cG I filiform, 8–9 long, cG II microspines, about 2 long. Setal lengths: 1a about 10, c3 17–18, cp 23–24, h2 about 95, vF I 20–23, vF II 27– 28, mG I 23–27, mG II 27–28, gT I–II about 3, solenidia ϕI–II 10–11, ω 1 I–II 7–8. Type material examined. Female holotype (USNM) ex Peromyscus leucopus (Rafinesque) (Cricetidae), USA: Michigan, Barry County, 5 miles NE of Kellogg Gull Lake Biological Station, 3 July 1958, coll. D. Clark. Type deposition. Holotype is deposited in USNM. Non-type material examined. One male and 1 female (UMMZ) (MH 77-1016 A) ex Peromyscus leucopus, USA: New York, Schuler Co., Arnot Forest, 16 October 1977, coll. M. Huybensz; 4 females (UMMZ, FMNH) (BMOC 87-0903 - 013) ex Peromyscus mexicanus (Saussure) (= nudipes) (FMNH 128534), COSTA RICA: Puntarenas Prov, Monteverde, 1570m, 10º00'N, 84º50'W, 1 May 1986, coll. R.M. Timm (RMT 3724). Host range and distribution. This species is known from Peromyscus leucopus from USA (Michigan and New York) (Hyland & Clark 1959; our data) and Peromyscus mexicanus from Costa Rica (new host). Remarks. Y. faini has been described from three female and one?nymphal specimens (Hyland & Clark 1959). According to the original description and our observations, the female holotype and a single collected male of Y. faini from the type host bear microspines cG I. Fain et al. (1967), who examined the two remaining paratypes, reported filiform setae cG I in these specimens. We also observed filiform setae cG I in a single female from the type host (see material). Unfortunately we were not able to examine female paratypes of this species because their present depository is unknown and they are probably lost. Thus, it is still unclear whether the holotype is an aberrant specimen, the shape of setae cG I is sexually dimorphic, or in females of Y. faini the shape of this seta is variable. Specimens from Peromyscus mexicanus differ slightly from mites from the type host by smaller sizes (see descriptions) and the length ratio of cp/c3 setae (1.3:1 vs. 1.7–1.8: 1 in specimens from Peromyscus leucopus). Additional collections from these hosts are necessary to clarify the status of specimens from P. mexicanus.

Published as part of Bochkov, Andre V., Zabludovskaya, Svetlana & Oconnor, Barry M., 2008, Phylogeny and systematics of the endoparasitic astigmatid mites (Acari: Sarcoptiformes) of mammals: families Gastronyssidae, Lemurnyssidae, and Pneumocoptidae, pp. 1-152 in Zootaxa 1951 (1) on pages 126-127, DOI: 10.11646/zootaxa.1951.1.1, http://zenodo.org/record/5240616