Radfordia (Microtimyobia) triton 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 : 58-64

18. Radfordia (Microtimyobia) triton Fain and Lukoschus, 1977

( Figs. 47–54 )

Radfordia (Microtimyobia) triton Fain and Lukoschus, 1977: 60 , figs. 59–62, 98, 99, 111 Diagnosis. FEMALE ( Fig. 47 ). Subcapitular setae m bifurcate. Setae vi distinctly wider and longer than e2. Setae e1 and f1 narrow lanceolate. Distances c1-d1 and d1-d2 subequal. Vulvar region without ornamentation. Setae ps3 distinctly developed, slightly curved. Setae ag2 at least 3 times longer than ag1. Setae 1b and 1d slightly thicker than 1a. Setae 2a and 3a whip-like, much longer than 2b. Trochanter I with distinct ventral projection and without tubercles. Measurements of holotype ( Fain & Lukoschus 1977): body, including gnathosoma, 405 long, 225 maximum wide. Lengths of setae: vi 75, ve 105, si 135; se 90, c1, c2, d1, d2 —all 78–82, e1 28 –33, e2 33 –38.

MALE ( Figs. 48 ). Subcapitular setae m filiform. Genital cone slightly elongated, length/width ratio 4:1, without lateral projection, with almost parallel lateral margins. Bases of setae vi situated posterior to setae ps2. Setae e2 and f1 subequal. Posterior end of opisthosoma without tubercles dorsally and with few tubercles ventrally. Setae 2a whip-like, much longer than 2b and 3a. Trochanter I with distinct ventral projection and without tubercles. Measurements of paratype ( Fain & Lukoschus 1977): body, including gnathosoma, 375 long, 210 maximum wide. Aedeagus 190 long. Lengths of setae: vi 18, si 80, se 135, c2 150, 2a 90, 3a 18, 4a 48.

LARVA ( Fig. 49 ). Idiosoma bearing setae vi, ve, si, se, c1, c2, d1, d2, e1, f1, h1, ps1; coxal fields bearing filiform setae 1a and 2a. Legs I–III consisting of 4 articulated segments (femur and genu fused). Tarsus II with one claw, tarsus III without claw. Leg I as in Fig. 49C and D . Setation of legs II and III (setae not homologized except for tarsus II): tarsus II 7 + 1 solenidion, tibia II 4, femur-genu II 2 + 1 solenidion, trochanter I 0; tarsus III 4, tibia III 3, femur-genu III 0; trochanter III 0.

PROTONYMPH ( Fig. 50 ). Idiosomal setae e2 added. Scale like seta 1b added on coxal fields I and filiform seta 3a added on coxal fields III. Leg setation as in larva.

DEUTONYMPH ( Fig. 51 ). Idiosomal setae f2 and ps2 added. Setae 4a added on coxal fields IV. Legs IV added, weakly developed, consisting of 4 primordial segments and without claw. Setation of legs II and IV (setae not homologized except for tarsus II): tarsus II 7 + 1 solenidion, tibia II 4, femur-genu II 3 + 1 solenidion, trochanter I 0; tarsus III 4, tibia III 3, femur-genu III 1; trochanter 0; tarsus IV 0, tibia IV 1, femur-genu IV 0, trochanter 0.

TRITONYMPH ( Figs. 52–54 ). Setae h1 added on idiosoma. Scale like setae 1c added on coxal fields I and filiform setae 2b added on coxal fields II. Legs I as in Fig. 53 . Claw added on tarsi III; legs IV distinctly developed without claw. Leg II–IV setation ( Fig. 54 ): tarsus II 7 + solenidion, tibia II 5, femur-genu II 3 + 1 solenidion, trochanter II 1; tarsus III 6, tibia III 3; femur-genu III 1, trochanter III 1; tarsus IV 4, tibia IV 3, femur-genu IV 1, trochanter IV 0.

FEMALE TRITONYMPH ( Fig. 52A–C ). Setae h2 stick-like, f2 and other dorsal idiosomal setae narrow lanceolate. Setae 3a and 4a whip-like, slightly longer than 2a. Tarsus IV with 4 setae.

MALE TRITONYMPH ( Fig. 52D–F ). Similar with female TN but setae 3a and 4a much shorter than 2a.

Type host and locality. Tscherskia triton from South Korea ( Fain & Lukoschus 1976, 1977).

Hosts and distribution. This species is known only from the type host Tscherskia triton from South Korea ( Fain & Lukoschus 1977) and Russia (Far East) (new locality) .

Material examined. Tscherskia triton — 1 male and 1 female paratypes ( ZISP), SOUTH KOREA: Yongpyong , 13 April 1954 , coll. unknown. 2 males, 6 females, 17 female TN (2 pharate), 4 male TN (2 pharate), 10 DN, 5 PN, and 2 larvae ( AVB 09-1201 - 001 ) ( ZISP 60572 ), RUSSIA: the Far East , Primorsk Territory , Khasan Distr., near Pos’et [Posvet] village, 42°40'00"N, 130°48'00"E, 18 May 1928, coll. S. Obolensky.

Type deposition. Radfordia triton —USNM, female holotype (no. 301.245), (not examined).

Figures

FIGURE 47. Radfordia (M.) triton Fain and Lukoschus, 1977, female. A, dorsal view; B, ventral view; C, seta m. Scale bars: A, B = 100 µm; C = 50 µm.

FIGURE 48. Radfordia (M.) triton Fain and Lukoschus, 1977, male. A, dorsal view; B, ventral view; C, genital cone. Scale bars: A, B = 100 µm; C = 50 µm.

FIGURE 49. Radfordia (M.) triton Fain and Lukoschus, 1977, larva. A, idiosoma in dorsal view; B, same in ventral view; C, leg I in dorsal view; D, same in ventral view; E, leg II in ventral view; F, leg III in ventral view. Scale bars: A, B = 100 µm; C– F = 50 µm.

FIGURE 50. Radfordia (M.) triton Fain and Lukoschus, 1977, protonymph. A, idiosoma in dorsal view; B, same in ventral view; C, leg II in ventral view; D, leg III in ventral view. Scale bars: A, B = 100 µm; C, D = 50 µm.

FIGURE 51. Radfordia (M.) triton Fain and Lukoschus, 1977, deutonymph. A, idiosoma in dorsal view; B, same in ventral view; C, leg II in ventral view; D, leg III in ventral view; E, leg IV in ventral view. Scale bars: A, B = 100 µm; C–E = 50 µm.

FIGURE 52. Radfordia (M.) triton Fain and Lukoschus, 1977, female tritonymph. A, idiosoma in dorsal view; B, same in ventral view; C, tarsus IV in ventral view. Male tritonymph. D, idiosoma in dorsal view; E, same in ventral view; F, tarsus IV in ventral view. Scale bars: A, B, D, E = 100 µm; C, F = 50 µm.

FIGURE 53. Radfordia (M.) triton Fain and Lukoschus, 1977, leg I of female tritonymph. A, dorsal view; B, ventral view.

FIGURE 54. Radfordia (M.) triton Fain and Lukoschus, 1977, legs II–IV of female tritonymph in ventral view. A, leg II; B, leg III; C, leg IV.