Radfordia (Microtimyobia) hylandi Fain and Lukoschus, 1977

Bochkov, Andre V., 2011, Mites of the subgenus Microtimyobia (Acariformes: Myobiidae: Radfordia) and their host-parasite relationships with cricetid rodents (Cricetidae) 2954, Zootaxa 2954 (1), pp. 1-86 : 36-38

8. Radfordia (Microtimyobia) hylandi Fain and Lukoschus, 1977

( Figs. 23 , 24 )

Radfordia (Microtimyobia) hylandi Fain and Lukoschus, 1977: 69 , figs. 69–72, 89, 90, 109, 110

Diagnosis. FEMALE ( Fig. 23 ). Subcapitular setae m with 4 tines. Setae vi distinctly wider than e2. Setae e1 and f1 filiform. Distances c1-d1 and d1-d2 subequal. Vulvar region ornamented by tubercles. Setae ps3 distinctly developed, slightly curved. Setae ag2 twice longer than ag1. Setae 1b and 1d slightly thicker than 1a. Setae 2a and 3a whip-like, much longer than 2b. Trochanter I with ventral projection, without tubercles. Measurements of paratype ( Fain & Lukoschus 1977): body, including gnathosoma, 380 long, 215 maximum wide. Lengths of setae: vi 60, si 95, se 75, c1 60, c2 75, d1 and d2 about 60, e1 16, e2 50.

MALE ( Fig. 24 ). Subcapitular setae m membranous with 4 tines. Genital cone slightly elongated, length/width ratio 1.7:1, with straight and parallel lateral margins and distinct lateral shoulders. Bases of setae vi situated anterior to setae ps2. Setae f1 about 2 times shorter than e2. Posterior end of opisthosoma without tubercles dorsally and with tubercles ventrally. Setae 2b whip-like, much longer than 2a and 3a. Trochanter I with ventral projection, without tubercles. Measurements of holotype ( Fain & Lukoschus 1977): body, including gnathosoma, 285 long, 160 maximum wide. Aedeagus 108 long. Lengths of setae: vi 18, si 40, se 100, c2 100, e1 66/60, e2 42, f1 24.

FEMALE TRITONYMPH (strongly damaged). Tarsus IV with 4 setae.

Type host and locality. Microtus pennsylvanicus from USA (Patience Island) ( Fain & Lukoschus 1977).

Hosts and distribution. This species is associated with Nearctic arvicolines of the genus Microtus ( Fain & Lukoschus 1977; Dubinina & Bochkov 1996). Its record from Microtus pinetorum in the USA (Indiana and Maryland) ( Drummond 1957; Fain & Lukoschus 1977) should been referred to Radfordia pitymys sp. nov. (see above). Whereas records of this species from Myodes gapperi from USA (Rhode Island) and Canada (St. Zenon) ( Fain & Lukoschus 1977) are probably accidental.

It was recorded from:

Microtus pennsylvanicus from various localities in USA and Canada ( Ewing 1938; Drummond 1957; Fain & Lukoschus 1977);

Microtus oregoni from USA ( Whitaker & Maser 1984);

Microtus mexicanus from USA (Texas) ( Fain & Lukoschus 1977);

Microtus miurus (extinct subspecies egorovi) from Russia (Yakutia) ( Dubinina & Bochkov 1996).

Material examined. Microtus pennsylvanicus — 1 male and 1 female paratypes ( ZISP), USA: Michigan, Roberts Lake , 18 June 1967, coll. Wrenn ; 4 females ( BMOC 97-0907 - 001 ), USA: Michigan, Oakland Co., Milford , 7 September 1997, coll. R. Ochoa ; 2 females ( BMOC 02-0925 - 002 ), USA: Michigan, Livingston Co., E.S. George Reserve , 25 September 2002, coll. A.J. Dowling ; 2 males and 3 females ( BMOC 95-0316 - 001 ), USA: Michigan, Washtenaw Co., 2 mi NW Dexter , 16 March 1995 , coll. B.M. OConnor; 1 female ( IRSNB), USA: Michigan, Emmet Co., 25 July 1968, coll. Wrenn ; 1 female ( IRSNB), USA: New York, Patience Island , 13 June 1956, coll. J. Cronan ; 1 male and 1 female ( IRSNB), USA: New York, Dutch Island , 14 June 1956, coll. J. Cronan.

† Microtus miuris egorovi (Pleistocene, about 35 thousand years)— 3 males, 8 females, and 1 female TN, RUS- SIA: Yakutia, basin of Indigirka River, Surovy Spring (tributary of Dyurin’-Yuryakh River), summer 1968, coll. G. Feigin.

Type deposition. Radfordia hylandi —USNM, male holotype (no. 84.119) (not examined)

Figures

FIGURE 23. Radfordia (M.) hylandi Fain and Lukoschus, 1977 from Microtus pennsylvanicus, female. A, dorsal view; B, ventral view; C, seta m, D, vulvar region. Scale bars: A, B = 100 µm; C, D = 50 µm.

FIGURE 24. Radfordia (M.) hylandi Fain and Lukoschus, 1977, male from Microtus pennsylvanicus. A, dorsal view; B, ventral view; C, seta m; D, genital cone. Specimen from fossil Microtus miurus. E, genital cone. Scale bars: A, B = 100 µm; C–E = 50 µm.