Radfordia (Microtimyobia) lemnina ( Koch, 1841 )

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 : 9-20

1. Radfordia (Microtimyobia) lemnina ( Koch, 1841)

( Figs. 1–8 )

Dermaleichus lemninus Koch, 1841 : fasc. 33.5, fig. 33.5

Myobia lemnina, Poppe 1896: 332 , figs. 4–6; Radford 1935: 251, figs. 9–11

Radfordia lemnina, Ewing 1938: 186

Radfordia (Graphiurobia) lemnina, Fain 1975: 448

Radfordia (Microtimyobia) lemnina, Fain & Lukoschus 1976: 178, 1977: 60 , figs. 81, 82, 103; Bochkov 1995: 483, figs. 5, 6; 2009b: 152, fig. 52

Radfordia (Microtimyobia) micromys Fain and Lukoschus, 1976: 178 ; syn. nov.

Radfordia lemnina hata Uchikawa, Nakata and Takahashi, 1997: 672 , figs. 1, 2, 4, 7, 8, 10, 17–20; syn. nov.

Radfordia (Microtimyobia) stekolnikovi Bochkov and Mironov, 1998: 305 , fig. 2; syn. nov.

Radfordia (Microtimyobia) stenocrani Bochkov and Mironov, 1998: 306 , fig. 3; syn. nov.

Diagnosis. FEMALE ( Figs. 1 , 3–7 ). Subcapitular setae m generally with 3 tines (in specimens from Microtus gregalis with 2 tines, in some specimens from Microtus (Terricola) spp. and Chionomys with 4 tines). Setae vi distinctly wider than e2. Setae e1 and f1 narrow lanceolate. Distances c1-d1 and d1-d2 subequal. Vulvar region distinctly ornamented. Setae ps3 distinctly developed, slightly curved. Setae ag2 at least twice longer than ag1. Setae 1b and 1d about 1.5 times thicker than 1a. Setae 2a and 3a whip-like, much longer than 2b. Trochanter I with distinct ventral projection and without tubercles. Measurements (10 specimens from Microtus arvalis , Crimea): body, including gnathosoma, 390–450 long, 230–260 maximum wide. Lengths of setae: vi 50–60, ve 95–110, si 90–110, se 70–85, c1 50–60, c2 70–80, d1 60–70, d2 65–75, e1 25 –30, e2 45 –48, f1 25–35, 2a 80–100, 3a 75–100, 4a 30–35.

MALE ( Figs. 2 , 5–7 ). Subcapitular setae m membranous with 2 tines (in specimens from Microtus gregalis with 1 tine). Genital cone slightly elongated, length/width ratio 1.5:1, without lateral projection, with sloping lateral margins. Bases of setae vi situated anterior to setae ps2. Setae f1 about 1.5 times shorter than e2. Posterior end of opisthosoma with tubercles. Setae 2a whip-like, much longer than 2b. Trochanter I with distinct ventral projection and without tubercles. Measurements (10 specimens from Microtus arvalis , Crimea): body, including gnathosoma, 300–340 long, 180–200 maximum wide. Aedeagus 110–130 long. Lengths of setae: vi 17–20, ve 80–90, si 28–33, se 80–95, c2 90–100, e1 55 –65, e2 30 –35, f1 20–25, 2a 80–100, 3a 15–23, 4a 30–40.

FEMALE TRITONYMPH ( Fig. 8 ). Setae f2 and h2 stick-like, other dorsal idiosomal setae narrow lanceolate. Length of setae 3a and 4a highly variable ( Table 1). Tarsus IV with 4 setae.

Remarks. I examined specimens of this species, including female TN, from a wide range of its hosts ( Figs. 5– 7 ). In female TN, the lengths of idiosomal setae are highly variable, especially lengths of ventral setae 3a and 4a ( Table 1). Unfortunately, distinctions between some subspecies and species which are closely related to Radfordia lemnina lemnina were based on the lengths of setae 3a and 4a and, therefore, status of these taxa should be reconsidered.

(i) I re-examined the holotype of R. lemnina micromys Fain and Lukoschus, 1976 described from Micromys minutus ( Muridae ) ( Holland) ( Fain & Lukoschus 1976, 1977) and three specimens of this subspecies from the same host from Russia (Chelyabinsk Prov.). These specimens are not distinguishable from females of Radfordia lemnina lemnina parasitizing voles. Discriminative measurements of R. lemnina micromys provided by Fain & Lukoschus (1977), actually, do not differentiate it from the specimens from the type host ( Microtus arvalis ) (see diagnosis of Radfordia lemnina ). Thus, I consider the subspecies R. lemnina micromys syn. nov. as a junior synonym of Radfordia lemnina .

(ii) Radfordia lemnina hata Uchikawa, Nakata and Takahashi, 1997 was described from Microtus montebelli from Japan ( Uchikawa et al. 1997). The adults of this species are not distinguishable from R. lemnina lemnina . In females of R. lemnina hata , setae m bear four tines (vs. three tines in R. lemnina lemnina from the type host). In females of R. lemnina lemnina from different hosts, however, these setae also have four teeth ( Figs. 5 , 7 ). At the same time, some specimens of R. lemnina hata have setae m with three teeth ( Uchikawa et al. 1997). Males of R. lemnina hata have a slightly longer genital cone than in the nominate form and according to Uchikawa et al. (1997): “p. 674, no other distinctive characters and measurements that warrant subspecies rank have been found in the male [ R. lemnina hata —my note]”. However, I observed the same shape of the genital cone in the nominate form from different hosts ( Figs. 5–7 ). The main difference of this subspecies from the nominate form is whip-like setae 3a of female TN, which are much longer than those in female TN from Microtus agrestis (mistakenly considered by Uchikawa et al. [1997] as the type host of R. lemnina lemnina ). In the female TN of R. lemnina lemnina , the lengths of these setae are highly variable not only in specimens from different host species (see Table 1) but also in specimens from different geographical localities from the same host species. Moreover, these setae can vary in the same mite specimen being strongly asymmetric; this phenomenon was observed also by Uchikawa et al. (1997). Thus, I consider subspecies R. lemnina hata syn. nov. as a junior synonym of Radfordia lemnina .

(iii) Like Uchikawa et al. (1997), Bochkov & Mironov (1998) overestimated such characters as the length of setae 3a and 4a in female TNs when describing Radfordia stekolnikovi Bochkov and Mironov, 1998 from Chionomys nivalis (North West Caucasus) and Radfordia stenocrani Bochkov and Mironov, 1998 from Microtus gregalis ( Russia, Chelyabinsk Prov.). In both these species, adults are almost not discernible from those of Radfordia lemnina (from the type host), but female TNs have whip-like setae 3a and 4a. The examination of these characters in mites from different hosts and geographical localities showed that they are too variable and can not serve for species differentiation. I consider, therefore, the species Radfordia stekolnikovi syn. nov. and R. stenocrani syn. nov. as junior synonyms of Radfordia lemnina .

(iv) Subspecies Radfordia lemnina mikado Uchikawa et al., 1997 from Myodes rutilus mikado and R. lemnina japonica Uchikawa et al., 1997 from Myodes rufocanus , Myodes rex , Myodes andersoni , and Myodes smithii described from Japan ( Uchikawa et al. 1997) are synonymized by me with Radfordia clethrionomys and Radfordia rufocani , respectively. Reasons for such taxonomical decisions are provided under respective sections (see below).

Type host and locality. Microtus arvalis from Germany ( Koch 1841). Later on, Radford (1935) recorded it from Microtus agrestis from England. Since this record some authors ( Fain & Lukoschus 1977; Uchikawa et al. 1997) mistakenly indicated Microtus agrestis as the type host for this species.

Hosts and distribution. This species is associated with Eurasian voles of the genera Microtus and Chionomys ; it has probably secondarily switched to Micromys minutus ( Muridae ). The record of this species from Peromyscus maniculatus from USA ( Allred 1957), probably, should be referred to Radfordia subuliger Ewing, 1938 belonging to the species group “ subuliger ”, incertae sedis in the genus Radfordia ( Fain & Bochkov 2002) . The finding of R. lemnina on Microtus ochrogaster from USA (Indiana) by Whitaker and Wilson (1968) needs confirmation and could be referred to Radfordia hylandi . The records of R. lemnina on Apodemus sylvaticus (Muridae) from Czech Republic ( Dusbabek & Daniel 1975), Apodemus flavicollis from Bulgaria ( Beron 1973), Apodemus agrarius and Mus musculus from Poland ( Kielczewski et al. 1974)—all from the family Muridae are obviously accidental. The list of hosts for this mite species provided by Haitlinger (1988) includes improbable hosts. Haitlinger (1988) recorded R. lemnina not only on different rodents but even on shrews. In my opinion such unexpected findings are results of mechanical contamination during collecting and, therefore, the results of this author are not taken into consideration here.

Radfordia lemnina was recorded from:

Microtus subterraneus from Czech Republic ( Dusbabek & Daniel 1975);

Microtus majori from Russia (North West Caucasus) ( Bochkov 1995);

Microtus daghestanicus from Russia (North West Caucasus) ( Bochkov 1995);

Microtus schelkovnikovi from Azerbaijan (new host);

Microtus tatricus from Poland ( Haitlinger 1988);

Microtus socialis from Ukraine (new locality), Turkey (new locality), Azerbaijan (new locality), Kazakhstan (new locality), Turkmenia ( Bochkov 1995);

Microtus schidlovskii from Turkey (new host);

Microtus arvalis from England ( Radford 1935), Belgium and Holland ( Fain & Lukoschus 1977), Germany (Koch 1834; Poppe 1896), Romania ( Faider & Solomon 1963), Czech Republic ( Dusbabek & Daniel 1975), Poland ( Kielczewski et al. 1974; Haitlinger 1988), Ukraine ( Dubinin & Volgin 1955; Sklyar 1975; Dubinina & Sosnina 1977; Bochkov 1995), Russia (St. Petersburg Prov.) ( Dubinin & Volgin 1955) and Karelia ( Bochkov 1995), Armenia ( Bochkov 1995);

Microtus levis from Turkey (new host);

Microtus ilaeus from Kirghizia ( Chirov et al. 1997);

Microtus transcaspicus from Turkmenia ( Fain & Lukoschus 1977);

Microtus agrestis from England ( Radford 1935), Holland and Belgium ( Fain & Lukoschus 1977), Czech Republic ( Dusbabek & Daniel 1975), Russia (Karelia, Chelyabinsk Prov., Bashkiria) ( Bochkov 1995);

Microtus middendorfi from Russia (Yakutia) ( Bochkov 1995);

Microtus fortis from China ( Fain & Lukoschus 1977), South Korea (new locality), Russia (Far East) (new locality);

Microtus oeconomus from Holland ( Fain & Lukoschus 1977), Poland ( Haitlinger 1988), Russia (Chelyabinsk Prov.) and Armenia ( Bochkov 1995), USA (Alaska) ( Fain & Lukoschus 1977);

Microtus mujanensis from Russia (Buryatia) (new host);

Microtus mongolicus from Russia (Chita Prov.) (new host);

Microtus maximowiczii from Russia (Chita Prov.) (new host);

Microtus montebelli from Japan ( Fain & Lukoschus 1977; Uchikawa et al. 1997);

Microtus gregalis from Russia (Chelyabinsk Prov.) ( Bochkov & Mironov 1998) and Kirghizia ( Bochkov 2009b);

Microtus xanthognathus from USA (Alaska) (new host);

Chionomys roberti from Russia (North West Caucasus) ( Bochkov & Mironov 1998), Turkey (new locality);

Chionomys nivalis from Spain ( Diaz-Lopez et al., 1991), Bulgaria (new locality), Russia (North West Caucasus) ( Bochkov & Mironov 1998);

Chionomys gud from Russia (North West Caucasus);

Micromys minutus ( Muridae ) from Holland ( Fain & Lukoschus 1977) and Russia (Chelyabinsk Prov.) ( Bochkov & Mironov 1998).

Material examined. Microtus arvalis — 5 males and 9 females, UKRAINE: Zakarpat’e Prov., Petros Mountain , 27 August 1959, coll. S. Vysotskaya ; 25 males and 25 females, 14 female TN, UKRAINE: Crimea, July 1961, coll. E. Sosnina ; 2 males and 6 females, RUSSIA: Karelia, Petrozavodsk , 31 May 1956, coll. R. Albova ; 9 females, RUSSIA: Volzhsko-Kamskiy Reservation , 25 May 1956 , coll. unknown; 1 male, ARMENIA: Razdan Distr., Takerli village , 27 June 1988, coll. E. Dubinina.

Microtus levis — 1 male and 2 females ( AVB 09-1109 - 001 ), TURKEY : Western Taurus , Beydaglar Range, 6 km W from Kizlarsivrisi, 127 m, 36° 35'813"N, 30°03'199"E, 25 April 2009, A. Stekolnikov ( AS #5) ; 11 females ( AVB 09-1109 - 002 ), same data ( AS #6) ; 3 females ( AVB 09-1109 - 006 ), same data ( AS #3) ; 11 females ( AVB 09- 1109 - 003 ), same data, ( AS #4) ; 1 female TN ( AVB 09-1109 - 004 ), TURKEY : Central Taurus , Aladaglar Range, 5 km SEE from Yelatan, 1930 m, 37°39'947"N, 35°04'451"E, 6 May 2009, coll. A. Stekolnikov ( AS #25) .

Microtus ilaeus — 3 females, KIRGHIZIA: Issyk-Kul’ Lake , other data unknown .

Microtus schidlovskii — 3 males and 2 male TN ( AVB 09-1109 - 005 ), TURKEY: Central Taurus , Bolkar Range , 12 km NW from Çamlıyayla (Namrun)m SEE from Yelatan, 2467 m, 37°15'239"N, 34°30'519"E, 11 May 2009, A. Stekolnikov (AS #39) .

Microtus agrestis — 7 males and 22 females, RUSSIA: Karelia, Kalevala Distr., Krivoy Porog village , 20 August 1956, coll. R. Albova ; 1 female, RUSSIA: Chelyabinsk Prov., near Shugunyak Lake , 8 June 1975, coll. E. Dubinina ; 1 female, RUSSIA: Bashkiria, Kukshik Mountain , 2 July 1975, coll. E. Dubinina ; 2 males, 3 females, 23 female TN (3 pharate), and 4 male TN (all pharate) ( AVB 09-1109 - 011 ), RUSSIA: Vologda Prov., Gryazovets Distr. , 7 August 1937, coll. Naumov.

Microtus socialis — 1 female, UKRAINE: Askaniya-Nova , 24 July 1984, coll. S. Zabludovskaya ; 1 male and 1 female, TURKMENIA:? Amamly , 6 June 1940, coll. unknown ; 2 males, 1 female, and 14 female TN (one pharate) ( AVB 09-1109 - 007 ), TURKEY: Central Taurus , Aladaglar Range, 5 km SEE from Yelatan, 1930 m, 37°39'947"N, 35°04'451"E, 6 May 2009, coll. A. Stekolnikov (AS #23) ; 1 male and 5 female TN ( AVB 09-1109 - 008 ), TURKEY: same (AS #21) ; 1 female, 6 male TN (one pharate), and 6 female TN (one pharate) ( AVB 09- 1109 - 009 ), KAZAKHSTAN: Gur’evsk Prov. , Zhilokosinskiy Distr., May 1962, A.G. Maleeva ; 1 male TN and 3 female TN ( AVB 09-1109 - 010 ), AZERBAYDJAN: November 1953, coll. Kh. Alekperov.

Microtus transcaspicus —2 pharate female TN ( AVB 09-1109-024) ( ZISP 68833), TURKMENIA: Ashkhabad Prov., 21 km from Ashkhabad, Firyuzinskoe Gorge, 18–19 September 1980, coll. M. Meyer.

Microtus oeconomus — 2 males and 10 females, ARMENIA: Razdan Distr., Takerli village , 24 June 1988, coll. E. Dubinina ; 9 males and 9 females, RUSSIA: Chelyabinsk Prov., near Shuguhyak Lake , 20 June 1975, coll. E. Dubinina ; 1 male, 5 females, 4 male TN (1 pharate), and 9 female TN (2 pharate) ( AVB 09-1109 - 023 ) ( ZISP 43242 ), RUSSIA: Komi Republic, other data unknown ; 1 male TN, USA: Alaska, Unalaska Island , 1961, coll. Homes.

Microtus middendorfi — 2 males and 1 female, RUSSIA: Yakutia , head of Gadaralon River, 24 June 1956, coll. Kapitonov ; 2 male TN and 1 female TN ( AVB 09-1109 - 016 ) ( ZISP 42947 ), RUSSIA: Yakutia , Bulunskiy Distr. , Gadarala River, tributary of Kunga River, 24 June 1956, coll. Kapitonov.

Microtus maximowiczii — 2 male TN and 1 female TN ( AVB 09-1109 - 012 ), RUSSIA: Chita Prov., 157500 ft from Chita , July 1925, coll. Vinogradov ; 1 male TN and 6 female TN (1 pharate) ( AVB 09-1109 - 013 ) ( ZISP 42641 ), RUSSIA: Amur Prov., Shimanovsk Distr., between Simonovskoe and Novo-Stepanovo villages, 18 August 1959 , T. Zalesskaya; 2 females and 1 female TN ( AVB 09-1109 - 014 ) ( ZISP 64886 ), RUSSIA: Amur Prov., Skovorodino Distr., Urusha , 31 May 1976, coll. F. Golenishchev.

Microtus mongolicus — 4 male TN (1 pharate) and 4 female TN (2 pharate) ( AVB 09-1109 - 015 ), RUSSIA: Chita Prov. , 157500 ft NW from Chita, near Ivan Lake, July 1925, coll. Vinogradov and Obolenskiy.

Microtus mujanensis — 1 male, 2 male TN (1 pharate) and 5 female TN (1 pharate) ( AVB 09-1109 - 017 ) ( ZISP 64864 ), RUSSIA: Buryatia, Muyskiy Distr., Dogopchan , 18 April 1976, coll. F. Golenishchev ; 1 male, 2 females, 8 male TN (5 pharate), and 4 female TN (1 pharate) ( AVB 09-1109 - 018 ) ( ZISP 64872 ), same data, 20 April 1976 ; 2 males, 2 females, 6 male TN (3 pharate), 10 female TN (1 pharate) ( AVB 09-1109 - 019 ), ( ZISP 64871 ) same data ; 2 females, 4 male TN (1 pharate), and 2 pharate female TN ( AVB 09-1109 - 020 ), ( ZISP 64873 ) same data, 19 April 1976 ; 8 male TN (2 pharate) and 2 female TN ( AVB 09-1109 - 021 ), ( ZISP 64859 ) same data, 16 April 1976 .

Microtus fortis — 5 males, 7 male TN, and 6 female TN (1 pharate) ( AVB 09-1109 - 022 ) ( ZISP 3181 ), RUS- SIA: the Far East , Primorskiy Territory , Khankayskiy Distr., Troitskoe village, 8 September 1919, coll. A. Cherskiy ; 1 female TN ( IRSNB), SOUTH KOREA: Chipori , 16 May 1952, coll. R. Traub.

Microtus majori — 2 males, 50 females, 10 female TN, and 5 male TN, RUSSIA: Krasnodar Territory, Caucasus Reservation, near Guseripl’ village , Abago Mountain , July 1991, coll. A. Bochkov ; 1 male TN and 2 female TN ( AVB 08-0709 - 003 ), RUSSIA: Karachay-Cherkessya, Arkhyz, Orlyonok River , 1700 m, 1 August 2000, coll. A. Stekolnikov (AS #45) ; 3 females ( AVB 09-1109 - 031 ), RUSSIA: Krasnodar Territory, El’brus village, Dzhantugan , 28 June 1996, coll. A. Stekolnikov (AS #127) ; 1 female ( AVB 09-1109 - 032 ), RUSSIA: Krasnodar Territory, Sunduki Mountain , 1700 m, 12 June 2002, coll. A. Stekolnikov.

Microtus daghestanicus — 24 males, 30 females, 10 female TN, and 10 male TN, RUSSIA: Krasnodar Territory, Caucasus Reservation, near Guseripl’ village , Abago Mountain , July 1991, coll. A. Bochkov ; 1 male, 1 female, 3 male TN, and 2 female TN (1 pharate) ( AVB 09-1109 - 025 ), RUSSIA: Krasnodar Territory, Sunduki Mountain , 2100 m, 10 June 2002, coll. A. Stekolnikov ; 2 females ( AVB 08-0709 - 002 ), RUSSIA: Karachay- Cherkessya, Arkhyz, Temirkulak River , 2300 m, 29 July 2000, coll. A. Stekolnikov ; 3 males, 1 female, and 2 female TN ( AVB 09-1109 - 026 ), RUSSIA: Karachay-Cherkessya, Arkhyz , 26 July 2000, coll. A. Stekolnikov ; 2 males, 1 female, 1 male TN ( AVB 09-1109 - 027 ), RUSSIA: Krasnodar Territory, Sunduki Mountain , 2100 m, 10 June 2002, coll. A. Stekolnikov ; 3 males, 17 females, and 1 female TN ( AVB 09-1109 - 028 ), RUSSIA: Krasnodar Territory, Bezengi , 1-st cordon, 16 June 1996, coll. A. Stekolnikov (AS # 88) ; 1 male and 1 female ( AVB 09-1109 - 029 ), RUSSIA: Krasnodar Territory, Sunduki Mountain , 2100 m, 10 June 2002, coll. A. Stekolnikov ( AS #64).

Microtus schelkovnikovi — 3 males, 1 female, 15 female TN (3 pharate), and 1 male TN ( AVB 09-1201 - 020 ) ( ZMMU S 124080 ), AZERBAIJAN:?Kyzyl-Atanskiy Reservation, Kulagin Tract, January-February 1982, coll. V.G. Babenko.

Microtus subterraneus — 1 female, UKRAINE: Vinnitsy Prov. , Bilki village, 9 July 1957, coll. G. Gushcha.

Microtus gregalis — female TN [holotype of R. stenocrani ( ZISP T-My-11)], 1 male, 4 female TN, and 3 male TN [paratypes of R. stenocrani ], RUSSIA: Chelyabinsk Prov., near Shugunyak Lake , 17 June 1976, coll. E. Dubinina ; 1 female, 1 male, 1 female TN, KIRGHIZIA: Kungey Ala-Too Mountain Ridge, 25 August 1973, coll. E. Dubinina.

Microtus xanthognathus — 2 males, 3 females, and 2 female TN ( AVB 09-1109 - 033 ), USA: Alaska, 5 m N Fairbanks , 15 June 1989, coll. J. Whitaker Jr.

Chionomys roberti — 3 males, 10 females, 3 female TN, RUSSIA: Krasnodar Territory, Caucasus Reservation, near Guseripl’ village , Abago Mountain , July 1991, coll. A. Bochkov ; 1 male and 5 female TN ( AVB 09-1109 - 034 ), TURKEY: Gul Dagi—Fundukli , 1800 m, 26 June 1998, coll. A. Stekolnikov (AS # 86).

Chionomys nivalis —female TN [holotype of R. stekolnikovi ( ZISP T-My-10)], 1 female [paratype of R. stekolnikovi ], RUSSIA: Krasnodar Territory, Caucasus Reservation, near Guzeripl’ village , Abago Mountain , 25 July 1991, coll. A. Bochkov and A. Stekolnikov ; 4 female and 5 female TN and 4 male TN [paratypes of R. stekolnikovi ] same data, 18 July 1991 ; 4 males, 4 females, and 1 female TN [paratypes of R. stekolnikovi ], same data, 21 July 1991 ; 1 female and 4 female TN [paratypes of R. stekolnikovi ], same data, 24 July 1991 ; 1 male, 4 females, 23 female TN (3 pharate), and 21 male TN (2 pharate) ( AVB 09-1203 - 001 ) ( ZISP 73190 ), BULGARIA: Vitosha Mountain , 188 m, 30 February 1988, coll. M.N. Meyer.

Chionomys gud — 1 male ( AVB 09-1109 - 035 ), RUSSIA: Krasnodar Territory, West Caucasus, Aibga Mountain Ridge , 2000 m, 15 August 1994, coll. A. Stekolnikov ( AS #157) ; 21 female TN and 1 male TN ( AVB 09-1109 - 036 ), RUSSIA: Krasnodar Territory, El’brus village, Dzhantungan , 27 June 1996, coll. A. Stekolnikov ( AS #124) ; 24 females ( AVB 09-1109 - 037 ), RUSSIA: Krasnodar Territory, Berkhnyaya Balkaria , 2 st cordon, 1550 m, 30 May 1996, coll. A. Stekolnikov ( AS #15) ; 11 female TN and 5 male TN (2 pharate) ( AVB 09-1203 - 002 ), RUSSIA: Kabardino-Balkaria Republic, Besunginskoe Canyon , 12 July 1977, coll. M.N. Meyer ; 1 female, 1 female TN, and 3 male TN ( AVB 09-1201 - 003 ) ( ZISP 64942 ), RUSSIA: Kabardino-Balkaria Republic, near Elbrus Mountain , 21 July 1977, coll. M.N. Meyer.

Chionomys sp. — 1 male, 3 females, 2 male TN, 7 female TN ( AVB 09-1109 - 038 ), RUSSIA: Krasnodar Territory, Caucasus Reservation, Chugush Mountain Range , 2600 m, 26 July 1994, coll. A. Stekolnikov (AS #68); 4 males, 12 females, 3 male TN, and 6 female TN ( AVB 09-1109 - 039 ), RUSSIA: Krasnodar Territory, Caucasus Reservation, Beresovaya River , 2600 m, 25 July 1994, coll. A. Stekolnikov ( AS #63) .

Micromys minutus — female [holotype of Radfordia micromys ] ( IRSNB), HOLLAND: Hamert , 5 September 1972 , coll. unknown; 3 females, RUSSIA: Chelyabinsk Prov., near Shugunyak Lake , 14 June 1975, coll. E. Dubinina.

Type depositions. Radfordia lemnina —unknown; Radfordia stekolnikovi —ZISP, female TN holotype (T-My- 10) (examined); Radfordia stenocrani —ZISP, female TN holotype (T-My-11) (examined); Radfordia micromys — IRSNB, female (examined); Radfordia lemnina hata —NSMT, female holotype (Ac 10701) (not examined).

Figures

FIGURE 1. Radfordia (M.) lemnina (Koch, 1841), female from Microtus arvalis. A, dorsal view; B, ventral view.

FIGURE 2. Radfordia (M.) lemnina (Koch, 1841), male from Microtus arvalis. A, dorsal view; B, ventral view.

FIGURE 3. Radfordia (M.) lemnina (Koch, 1841), details of female from Microtus arvalis. A, gnathosoma in dorsal view; B, same in ventral view; C, leg I in dorsal view; D, same in ventral view.

FIGURE 4. Radfordia (M.) lemnina (Koch, 1841), legs II–IV of female from Microtus arvalis in ventral view. A, leg II; B, leg III, C, leg IV.

FIGURE 5. Radfordia (M.) lemnina (Koch, 1841), details—vulvar region of female, genital cone of males, and setae m.

FIGURE 6. Radfordia (M.) lemnina (Koch, 1841), details—genital cone of males and setae m.

FIGURE 7. Radfordia (M.) lemnina (Koch, 1841), details—genital cone of males and setae m.

FIGURE 8. Radfordia (M.) lemnina (Koch, 1841), tritonymph from Microtus arvalis. A, female TN in dorsal view; B, same in ventral view; C, leg IV of female TN in dorsal view; D, male TN in dorsal view; E, same in ventral view; F, leg IV of male TN in dorsal view. Scale bars: A, B, D, E = 100 µm; C, F = 50 µm.