Doloisia (Doloisia)

Antonovskaia, Anastasia A. & Stekolnikov, Alexandr A., 2021, Redescriptions of ten chigger mite species (Acariformes: Trombiculidae) from Vietnam, Zootaxa 4969 (1), pp. 1-53 : 23-27

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

( Figs. 15A, B , 16–18 )

Doloisia alata Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961: 448, figs. 1–7.

Doloisia alata: Wen 1984: 302; Li et al. 1997: 333, fig. 2-23-2; Kudryashova 2004: 37.

Doloisia (Doloisia) alata: Vercammen-Grandjean 1968: 97; Chau et al. 2007: 142, fig. 67.

Diagnosis. SIF = 3B1b-N-3-2110.0000; fsp = 7.7.7; fCx = 3.5.10; fSt = 2.2; fPp = B/B/NNB; fSc: PL >> AM> AL; Ip = 688–741; fD = 4H-10-8-6-6-2; DS = 36–40; V = 38–41; NDV = 75–80. Eyes absent. Standard measurements of type series given in Table 6 .

Description (larva) [based on lectotype and 4 paralectotypes]. IDIOSOMA ( Figs. 15A, B , 16 ). Eyes absent; 36–40 dorsal idiosomal setae covered with long thin barbs, including two pairs of humeral setae; 4 sternal setae; 38–41 ventral setae; NDV = 75–80.

GNATHOSOMA ( Fig. 17A, B ). Cheliceral blade with two large hooks; gnathobase with moderate 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 small dorsal seta having 1 branch, 3 heavily branched ventral setae, and tarsala.

SCUTUM ( Fig. 15A , 17C ). Trapezoidal, wider than long, with straight posterior margin, moderately covered with small puncta, with 1 AM covered with short barbs, 1 pair of nude ALs and 1 pair of PLs covered with long thin barbs; AM anterior to level of ALs; PLs much longer AM, ALs shorter AM; sensilla bulbous, covered with spikes; sensillum bases situated at equal distances from levels of ALs and PLs.

LEGS ( Fig. 17D–F ).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 5B; genu 4B, 2 genualae, microgenuala; tibia 8B, 2 tibialae, microtibiala; tarsus 21B, 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 18B, tarsala, microtarsala near and proximal to tarsala, pretarsala. Leg III: coxa 10B; trochanter 1B; basifemur 2B; telofemur 3B; genu 3B, genuala; tibia 6B; tarsus 15B.

Hosts. Leopoldamys edwardsi [= Rattus grochovskii D. Tien (nomen nudum)] ( Schluger et al. 1961), Rattus losea (Wen 1984) .

Distribution. China (Wen 1984; Li et al. 1997), Vietnam.

Type material examined ( Fig. 18 ). Lectotype (here designated): larva ZMMU Tdt-3174 (specimen 1) 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: four larvae, ZMMU Tdt-3157 (specimen 2), ZMMU Tdt-3171 (specimen 1), ZMMU Tdt-3173 (specimen 2), ZMMU Tdt-3176 (specimen 1), same collection data as for lectotype.

Remarks. According to the original description, D. alata is similar to D. synoti Oudemans, 1910 and differs from it “by the absence of eyes, greater number of dorsal setae, and by other characters” ( Schluger et al. 1961). In our opinion, D. alata is more similar to D. hopuensis Hsu and Chen, 1964 than to D. synoti , and differs from it by a slightly lower number of idiosomal setae (fD = 4H-10-8-6-6-2 vs. 4H-12-10-8-6-4-2, DS = 36–40 vs. 46–48) and by longer legs (Ip = 688–741 vs. 546) ( Li et al. 1997).

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 16. Doloisia alata Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961. A, arrangement of dorsal idiosomal setae of paralectotype ZMMU Tdt-3176 (specimen 1); B, arrangement of ventral idiosomal setae of paralectotype ZMMU Tdt-3176 (specimen 1); C, dorsal idiosomal seta of 1st row of lectotype; D, anterior sternal seta of lectotype; E, preanal seta of lectotype. Scale bars: 100 μm (A, B), 20 μm (C–E).

FIGURE 17. Doloisia alata Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961, lectotype. A, ventral aspect of gnathosoma; B, dorsal aspect of gnathosoma; C, scutum; D, leg I (trochanter–tarsus); E, leg II (trochanter–tarsus); F, leg III (trochanter–tarsus). Scale bars: 20 μm (A, B), 50 μm (C), 50 μm (D–F).

FIGURE 18. Type specimens of Doloisia alata Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961 on slides.

Tables

TABLE 6. Standard measurements (µm) and numbers of setae of Doloisia alata (n = 5).

	Range	Mean	Lectotype
AW	29–35	31	31
PW	51–58	56	58
SB	24–26	25	24
ASB	19–22	21	22
PSB	17–19	18	19
SD	38–42	40	42
P-PL	5–7	6	5
AP	29–32	30	32
AM	29–32	31	32
AL	16–19	17	19
PL	42–43	43	43
H	40–42	41	42
D min	27–32	31	32
D max	39–43	41	43
V min	21–24	22	22
V max	31–36	33	34
pa	241–267	252	255
pm	205–212	209	208
pp	239–262	245	240
Ip	688–741	706	703
DS	36–40	38	40
V	38–41	40	40
NDV	75–80	78	80