Redescriptions of ten chigger mite species (Acariformes: Trombiculidae) from Vietnam
Author
Antonovskaia, Anastasia A.
Lomonosov Moscow State University, Moscow, Russia.
Author
Stekolnikov, Alexandr A.
0000-0001-7548-2671
Zoological Institute of the Russian Academy of Sciences, Universitetskaya embankment 1, Saint Petersburg 199034, Russia. Corresponding author. Alexandr. Stekolnikov @ zin. ru; https: // orcid. org / 0000 - 0001 - 7548 - 2671
tekolnikov@zin.ru
text
Zootaxa
2021
2021-05-10
4969
1
1
53
journal article
6434
10.11646/zootaxa.4969.1.1
0eae86d0-3ba1-436c-8e3e-5f7db258cdcf
1175-5326
4745657
AB348201-DA9D-4CB1-907E-DDD0118F81DB
Microtrombicula fulgida
(
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963
)
(
Figs. 31A, B
,
32–34
)
Trombicula fulgida
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963: 696
, figs. 23–29.
Microtrombicula fulgida
:
Kudryashova 2004: 19
.
Microtrombicula (Microtrombicula) fulgida
:
Chau
et al.
2007: 95
, fig. 44.
Diagnosis.
SIF = 6B-N-2-3111.1000; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = B/B/BbB; fSc: PL> AM> AL; Ip = 547–565; fD = 2H-7-10-5-5-4-4; DS = 31–37;
V
= 31–42;
NDV
= 67–74. Sensilla, sternal and coxal setae branched. Standard measurements of
type
series given in
Table 10
.
TABLE 10.
Standard measurements (µm) and numbers of setae of
Microtrombicula fulgida
(n = 4).
| Range |
Mean |
Lectotype
|
| AW |
42–44 |
43 |
42 |
| PW |
52–56 |
54 |
52 |
| SB |
15–18 |
16 |
16 |
| ASB |
20–21 |
20 |
20 |
| PSB |
19–21 |
21 |
19 |
| SD |
39–43 |
41 |
39 |
| P-PL |
11–14 |
12 |
11 |
| AP |
19–22 |
21 |
22 |
| AM |
24–25 |
25 |
25 |
| AL |
20–22 |
21 |
22 |
| PL |
29–33 |
31 |
32 |
| H |
33–39 |
36 |
39 |
|
D
min
|
18–24 |
21 |
24 |
| D max |
25–26 |
25 |
26 |
| V min |
9–16 |
14 |
14 |
| V max |
22–24 |
23 |
24 |
| pa |
192–198 |
195 |
198 |
| pm |
161–176 |
167 |
162 |
| pp |
189–194 |
191 |
189 |
| Ip |
547–565 |
553 |
549 |
| DS |
31–37 |
33 |
31 |
| V |
31–42 |
36 |
36 |
| NDV |
67–74 |
70 |
67 |
Description (larva)
[based on
lectotype
and
3 paralectotypes
]. IDIOSOMA (
Figs. 31A, B
,
32
). Eyes 2 + 2; 31–37 barbed dorsal idiosomal setae, including one pair of humeral setae; 4 sternal setae, each with 2 barbs; 31–42 ventral setae; NDV = 67–74.
FIGURE 31.
Microtrombicula fulgida
(
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963
)
, lectotype.
A
, anterior part of idiosoma, dorsal aspect;
B
, anterior part of idiosoma, ventral aspect.
Microtrombicula vitosa
(
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963
)
, paralectotype ZMMU Tdt-3281 (specimen 1).
C
, anterior part of idiosoma, dorsal aspect;
D
, anterior part of idiosoma, ventral aspect. Scale bars: 100 μm.
FIGURE 32.
Microtrombicula fulgida
(
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963
)
.
A
, arrangement of dorsal idiosomal setae of paralectotype ZMMU Tdt-3231, specimen 3;
B
, arrangement of ventral idiosomal setae of paralectotype ZMMU Tdt- 3231, specimen 3;
C
, dorsal idiosomal seta of 1
st
row of lectotype;
D
, coxal seta I of lectotype;
E
, coxal seta II of lectotype;
F
, anterior sternal seta of lectotype;
G
, posterior sternal seta of lectotype;
H
, preanal seta of lectotype. Scale bars: 100 μm (A, B), 20 μm (C–H).
FIGURE 33.
Microtrombicula fulgida
(
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963
)
.
A
, ventral aspect of gnathosoma of lectotype;
B
, dorsal aspect of gnathosoma of lectotype;
C
, scutum and eyes of lectotype (one sensillum missing);
D
, leg I (trochanter–tarsus) of paralectotype ZMMU Tdt-3231 (specimen 3);
E
, leg II (trochanter–tarsus) of paralectotype ZMMU Tdt- 3231 (specimen 3);
F
, leg III (trochanter–tarsus) of paralectotype ZMMU Tdt-3231 (specimen 3) (mastitarsala broken). Scale bars: 20 μm (A, B), 50 μm (C–F).
FIGURE 34.
Type specimens of
Microtrombicula fulgida
(
Schluger, Grochovskaja, Ngu, Hoe and Tung, 1963
)
on slides.
GNATHOSOMA (
Fig. 33A, B
). Cheliceral blade with tricuspid cap; gnathobase with sparse puncta and 1 pair of branched setae; cheliceral base and palpal femur with sparse puncta; galeala nude; palpal claw with 2 prongs, internal prong longer; setae on palpal femur and genu branched; dorsal and ventral palpal tibial setae branched, lateral palpal tibial seta with 1 branch; palpal tarsus with 6 branched setae and tarsala.
SCUTUM (
Figs. 31A
,
33C
). Pentagonal, wider than long, with anterolateral shoulders, with rounded posterior margin, moderately covered with small puncta, with 1 AM, 1 pair of ALs and 1 pair of PLs; AM anterior to level of ALs; all scutal setae uniformly covered with small barbs; PLs longest and ALs shortest scutal setae; sensilla flagelliform, with 8 long branches in distal half; sensillum bases situated close to each other and far anterior to level of PLs (PSB – P-PL =
7–10 µm
).
LEGS (
Fig. 33D–F
). All 7-segmented, with 1 pair of claws and claw-like empodium. Leg I: coxa with 1 seta bearing 3 long branches (1B); trochanter 1B; basifemur 1B; telofemur 5B; genu 4B, 3 genualae, microgenuala; tibia 8B, 2 tibialae, microtibiala; tarsus 23B, tarsala, microtarsala distal to tarsala, subterminala, parasubterminala, pretarsala. Leg II: coxa 1B (with 2 short barbs); trochanter 1B; basifemur 2B; telofemur 4B; genu 3B, genuala; tibia 6B, 2 tibialae; tarsus 16B, tarsala, microtarsala at level of tarsala, pretarsala. Leg III: coxa 1B (with 3 long branches); trochanter 1B; basifemur 2B; telofemur 3B; genu 3B, genuala; tibia 6B, tibiala; tarsus 13B, mastitarsala.
Host.
Rattus tanezumi
Temminck
[=
Rattus flavipectus
(Milne-Edwards)
]. The host was indicated as a “rat” on the slide labels but was identified as
R. flavipectus
in the thesis of Grochovskaja (unpublished typescript).
Distribution.
Vietnam
.
Type material examined
(
Fig. 34
).
Lectotype
(here designated): larva
ZMMU
Tdt-3232 (specimen 5) ex
R. tanezumi
(labeled as “rat”)
No
543,
Vietnam
,
Nghe An Province
,
Phu Quy
,
8 September1956
, coll.
I.M. Grochovskaja.
Paralectotypes
:
three larvae
,
ZMMU
Tdt-3229 (specimen 1),
ZMMU
Tdt-3231 (specimen 3),
ZMMU
Tdt-3280 “
Trombicula vitosa
”
(specimen 5), ex
R. tanezumi
(labeled as “rat”)
Nos
571, 568,
Vietnam
,
Nghe An Province
,
Phu Quy
,
10 September 1956
, coll.
I.M. Grochovskaja.
Remarks.
Microtrombicula fulgida
is similar to
M. munda
(Gater, 1932)
and differs from it in the greater number of idiosomal setae (fD = 2H-7-10-5-5-4-4, DS = 31–36, V = 32–42, and NDV = 67–74 vs. 2H-6-6-4-4-2-2, 26, 32, and 58, respectively), all coxal and sternal setae branched vs. nude (except coxal setae I), and by longer legs (Ip = 547–565 vs. 488) (
Vercammen-Grandjean 1965a
).
This species is also close to
M. nadchatrami
Vercammen-Grandjean, 1965
and differs from it in a shorter scutum (ASB = 20–21, PSB = 19–21, SD = 39–43, and AP = 19–22, vs. 24, 25, 49, and 25, respectively), shorter setae (AM = 24–25, AL = 20–22, PL = 29–33, D
min
= 18–24, D
max
= 25–26, V
min
= 9–16, V
max
= 22–24, vs. 31, 28, 38, 27, 32, 21, and 28, respectively), shorter legs (Ip = 547–565 vs. 644), and less branched sternal and coxal setae (sternal setae with 2 vs. about 6 barbs; coxal setae I and III with 3 vs. about 6 long branches; coxal setae II with 2 vs. multiple short barbs) (
Vercammen-Grandjean 1965a
).