Doloisia (Doloisia) fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961

Antonovskaia, Anastasia A. & Stekolnikov, Alexandr A., 2021, Redescriptions of ten chigger mite species (Acariformes: Trombiculidae) from Vietnam, Zootaxa 4969 (1), pp. 1-53 : 28-31

Doloisia (Doloisia) fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961

( Figs. 15C, D , 19–22 )

Doloisia fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961: 449 , figs. 8–16.

Doloisia fulminans: Kudryashova 2004: 39 .

Doloisia (Doloisia) fulminans: Vercammen-Grandjean 1968: 97 ; Chau et al. 2007: 147, fig. 71.

Diagnosis. SIF = 3B1N-N-3-2110.0000; fsp = 7.7.7; fCx = 3.5.10; fSt = 2.2; fPp = B/B/NNB; fSc: PL >> AM> AL; Ip = 688–763; fD = 4H-7-8-6-6-3; DS = 31–36; V = 31–38; NDV = 67–72. Eyes 1 + 1. Telofemur of leg I with long nude seta. Standard measurements of type series given in Table 7 .

Description (larva) [based on lectotype and 36 paralectotypes]. IDIOSOMA ( Figs. 15C, D , 19 ). Eyes 1 + 1; 31–36 dorsal idiosomal setae sparsely covered with short barbs, including two pairs of humeral setae; 4 sternal setae; 31–38 ventral setae; NDV = 67–72.

GNATHOSOMA ( Fig. 20A, B ). Cheliceral blade with two large hooks; gnathobase with sparse puncta and 1 pair of branched setae; galeala nude; palpal claw with 3 prongs, internal prong long and strongly curved; setae on palpal femur and genu branched; dorsal and lateral palpal tibial setae nude, ventral palpal tibial seta branched; palpal tarsus with 1 nude dorsal seta, 3 branched ventral setae, and tarsala.

SCUTUM ( Figs. 15C , 20C ). Trapezoidal, wider than long, with almost straight posterior margin, moderately covered with small puncta, with 1 AM, 1 pair of ALs, and 1 pair of PLs; all scutal setae sparsely covered with short barbs; AM at level of ALs; PLs much longer AM, ALs shorter AM; sensilla claviform, bearing few barbs; sensillum bases situated at equal distances from levels of ALs and PLs.

LEGS ( Fig. 21 ). All 7-segmented, with 1 pair of claws and claw-like empodium. Leg I: coxa with 3 branched setae (3B); trochanter 1B; basifemur 1B; telofemur 4B and 1 long nude seta; genu 4B, 2 genualae, microgenuala; tibia 8B, 2 tibialae, microtibiala; tarsus 20B, tarsala, microtarsala distal to tarsala, subterminala, parasubterminala, pretarsala. Leg II: coxa 5B; trochanter 1B; basifemur 2B; telofemur 4B; genu 3B, genuala; tibia 6B, 2 tibialae; tarsus 15B, tarsala, microtarsala near and proximal to tarsala, pretarsala. Leg III: coxa 10B; trochanter 1B; basifemur 2B; telofemur 3B; genu 3B, genuala; tibia 6B; tarsus 16B.

Hosts. Leopoldamys edwardsi [= Rattus grochovskii D. Tien (nomen nudum)] ( Schluger et al. 1961).

Distribution. Vietnam.

Type material examined ( Fig. 22 ). Lectotype (here designated): larva ZMMU Tdt-3160 (specimen 3) ex L. edwardsi No 44 [labeled as “ Rattus sp. n. ( Rattus grochovskii )”], Vietnam, Quang Ninh Province, Ha Lam District, Ha Long (= Hon Gai), 6 February 1956, coll. I.M. Grochovskaja. Paralectotypes: 36 larvae, ZMMU Tdt-3160 (specimen 2), ZMMU Tdt-3145 (specimen 3), ZMMU Tdt-3154 (specimens 1, 2, 3, 4), ZMMU Tdt-3155 (specimen 1), ZMMU Tdt-3156 (specimen 1), ZMMU Tdt-3157 (specimens 1, 3), ZMMU Tdt-3158 (specimens 1, 2, 3), ZMMU Tdt-3159 (specimen 2), ZMMU Tdt-3161 (specimen 4), ZMMU Tdt-3162 (specimen 1), ZMMU Tdt- 3164 (specimen 4), ZMMU Tdt-3166 (specimens 1, 2), ZMMU Tdt-3167 (specimens 2, 3, 4), ZMMU Tdt-3173 (specimens 3, 4), ZMMU Tdt-3174 (specimens 2, 3), ZMMU Tdt-3183 (specimen 4), ZMMU Tdt-3184 (specimens 1, 2), ZMMU Tdt-3186 (specimens 2, 3, 4), ZMMU Tdt-3187 (specimen 1), ZMMU Tdt-3188 (specimen 3), ZMMU Tdt-3190 (specimen 3), ZMMU Tdt-3191 (specimen 2), same collection data as for lectotype.

Remarks. According to the original description, D. fulminans is similar to D. alata and differs from it “by the presence of eyes and nude seta on telofemur of leg I and by longer dorsal setae, shape of trichobothria, greater size of body and scutum” ( Schluger et al. 1961). We confirm the similarity of these species and their difference by the presence of eyes (1 + 1 in D. fulminans and 0 in D. alata) and by the presence of long nude seta on telofemur of leg I in D. fulminans (absent in D. alata). Sensilla (trichobothria) bear a few barbs in D. fulminans and are densely covered with spikes in D. alata. Morphometric differences between these two species are as follows. Size of scutum: AW = 35–45, PW = 59–71, SB = 28–33, and PSB = 19–24 in D. fulminans vs. 29–35, 51–58, 24–26, and 17–19 in D. alata, respectively; lengths of setae: H = 52–60, D max = 45–60, and V max = 38–50 in D. fulminans vs. 40–42, 39–43, and 31–36 in D. alata, respectively. Doloisia fulminans also has a lower number of idiosomal setae (fD = 4H-6-8-6-6-3 and NDV = 67–72 vs. 4H-10-8-6-6-2 and 75–80 in D. alata).

Figures

FIGURE 15. Doloisia alata Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961. A, anterior part of idiosoma, dorsal aspect, of paralectotype ZMMU Tdt-3173 (specimen 2); B, anterior part of idiosoma, ventral aspect, of paralectotype ZMMU Tdt-3157 (specimen 2). Doloisia fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961. C, anterior part of idiosoma, dorsal aspect, of paralectotype ZMMU Tdt-3159 (specimen 2); D, anterior part of idiosoma, ventral aspect, of lectotype. Scale bars: 100 μm.

FIGURE 19. Doloisia fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961. A, arrangement of dorsal idiosomal setae of lectotype; B, arrangement of ventral idiosomal setae of lectotype; C, dorsal idiosomal seta of paralectotype ZMMU Tdt-3184 (specimen 2); D, anterior sternal seta of paralectotype ZMMU Tdt-3184 (specimen 2); E, posterior sternal seta of paralectotype ZMMU Tdt-3184 (specimen 2); F, preanal seta of paralectotype ZMMU Tdt-3184 (specimen 2). Scale bars: 100 μm (A, B), 20 μm (C–F).

FIGURE 20. Doloisia fulminans Schluger, Grochovskaja, Ngu, Hoe andTung, 1961, lectotype.A, ventral aspect of gnathosoma; B, dorsal aspect of gnathosoma; C, scutum and eyes. Scale bars: 20 μm (A, B), 50 μm (C).

FIGURE 21. Doloisia fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961, lectotype. A, leg I (trochanter–tarsus); B, leg II (trochanter–tarsus); C, leg III (trochanter–tarsus).

FIGURE 22. Type specimens of Doloisia fulminans Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961 on slides.

Tables

TABLE 7. Standard measurements (µm) and numbers of setae of Doloisia fulminans (n = 37).

	Range	Mean	Lectotype
AW	35–45	39	38
PW	59–71	66	68
SB	28–33	31	32
ASB	17–23	20	23
PSB	19–24	21	21
SD	39–44	42	44
P-PL	5–10	7	8
AP	30–36	33	36
AM	27–35	32	34
AL	18–28	23	23
PL	41–55	48	49
H	52–60	57	59
D min	31–43	38	39
D max	45–60	51	49
V min	24–34	28	24
V max	38–50	46	46
pa	239–270	256	252
pm	203–231	213	218
pp	242–273	256	263
Ip	688–763	726	733
DS	31–36	34	34
V	31–38	35	34
NDV	67–72	69	68