Microchironomus Kieffer from China (Diptera: Chironomidae)
Author
Yan, Chuncai
Author
Wang, Xinhua
text
Zootaxa
2006
1108
53
68
journal article
50824
10.5281/zenodo.171476
84749c3a-8aa1-45ab-ad63-c6c083817374
11755326
171476
Microchironomus deribae
(Freeman)
(
Fig. 2
A–E)
Chironomus
(
Cryptochironomus
)
deribae
Freeman 1957
: 395
Cryptochironomus deribae
(Freeman)
Tourenq 1966
: 459
Leptochironomus paraderibae
Laville & Tourenq 1967
: 185
Leptochironomus deribae
(Freeman)
Ringe 1970
: 315
;
Kugler 1971
: 344
;
Pinder 1978
: 126
Microchironomus deribae
(Freeman)
Saether 1977
: 101
;
Cranston & Judd 1989
: 256
;
Wang
et al
. 1991
: 10
;
Wang 2000
: 645
FIGURE 2.
Microchironomus deribae
(Freeman)
, Chinese specimen.
A,
thorax.
B,
legs; a, front leg; b, mid leg; c, hind leg.
C,
wing.
D,
dorsal view of hypopygium.
E,
ventral view of hypopygium.
Material examined:
CHINA
:
Tianjin
City, Jixian County, Duliujianhe River,
1 male
,
12.VI.1988
, X. Wang; Gansu Province, Linze County,
1 male
,
22.VI.1993
, light trap, G. Liu; Neimenggu Autonomous Region, Xilinhaote City, Dongwuzhumuqinqi County,
910m
a.s.l.,
7 males
,
7.VIII.1997
, H. Li.
Male imago
(
n
= 9, unless otherwise stated)
Total length 3.80–4.38, 4.01 mm. Wing length 1.53–2.13, 1.86 (8) mm. Total length/ wing length 1.98–2.50, 2.19 (8). Wing length/length of profemur 2.19–2.69, 2.54 (8).
Coloration: Thorax (
Fig. 2
A) dark brown, with black vittae; ventral 2/3 of preepisternum, most of anepisternum, and anterior 1/2 of postnotum black. Front legs with femora and distal 1/3 of tibia yellowish green, remaining parts of front leg dark brown, mid and hind legs yellowish green except tarsi 4 and 5 dark brown (
Fig. 2
B). Abdomen yellowish green to brown.
Head: AR 2.41–2.69, 2.53. Ultimate flagellomere 660–720, 687 µm long. Frontal tubercles rounded, 4–8, 6 (6) µm in diameter. Temporal setae 7–11, 9, including 0–1, 0 inner verticals, 2–4, 3 outer verticals, and 3–7, 5 postorbitals. Clypeus with 11–24, 15 setae. Tentorium 115–175, 137 µm long, 28–30, 29 µm wide. Palpomere lengths (in µm): 38–55, 44; 50–55, 52; 100–120, 110; 120–155, 134; 165–200, 186. Palp segment 5th/3rd 1.46–1.93, 1.70.
Thorax: Antepronotals 0–4, 2, acrostichals 0–6, 2, dorsocentrals 4–9, 6, prealars 2–4, 3. Scutellum with 1–4, 3 setae.
Wing (
Fig. 2
C): VR 1.06–1.13, 1.10 (8), R with 4–10, 7 (5) setae, R1 without setae, R4+5 with 2 setae at apex. Brachiolum with 2 or 3, 2 setae. Squama with 16–22, 18 setae.
Legs: Front tibia with 2 subapical setae, 50–90, 78 (7) and 70–75, 73 (2) µm long, spurs of middle tibia 13–20, 18 and 15–25, 20 µm long, comb with 22–32, 25 teeth, 8–10, 8 µm long; spurs of hind tibia 18–24, 20 and 22–26, 24 µm long, comb with 26–35, 31 teeth, 8–10, 10 µm long. Tarsus 1 of mid leg with sensilla chaetica 10–15, 13. Lengths (in µm) and proportions of legs as in
Table 2
.
TABLE 2.
Lengths (µm) and proportion of legs of
Microchironomus deribae
(Freeman)
, male (
n
= 9).
| fe |
ti |
ta1 |
ta2 |
ta3 |
ta4 |
ta5 |
LR |
| p1 |
700–780, 732 |
520–610, 563 |
730–820, 767 |
450–510, 478 |
380–410, 386 |
250–270, 258 |
90–150, 134 |
1.30–1.44, 1.36 |
| p2 |
710–780, 737 |
670–760, 711 |
330–370, 339 |
200–230, 214 |
160–180, 171 |
100–130, 116 |
100–110, 103 |
0.45–0.49, 0.48 |
| p3 |
800–860, 819 |
820–920, 862 |
530–600, 553 |
320–350, 328 |
280–300, 288 |
160–170, 165 |
120–130, 123 |
0.61–0.67, 0.65 |
Hypopygium (
Fig. 2
D–E): Tergite IX with 0–5, 2 setae. Laterosternite IX with 2–5, 4 setae. Anal point flake–shape, rounded apically, 60–98, 82 µm long, 25–33, 29 µm wide at base, 18–25, 21 µm wide at apex, with Vshaped ridge bearing 12– 18, 16 setae and numerous microtrichia. Ninth tergite with 2 lobes near base of anal point, with 3–4, 3 (8) setae and covered with microtrichia. Superior volsella 35–75, 47 µm long with 3 or 4, 3 setae and without microtrichia. Anal tergite bands V shaped, not united in middle. Phallapodeme 55–133, 91 µm long. Transverse sternapodeme 30–88, 54 µm long. Gonocoxite 100–138, 117 µm long, with 3–5, 4 strong setae along inner margin. Gonostylus 188–225, 210 µm long, strongly incurved and with swollen basally, and with tooth apically, bearing 18–28, 23 setae along inner margin. HR 0.44–0.73, 0.56, HV 1.69–2.12, 1.92.
Distribution:
The species is distributed in the Palaearctic, Afrotropical and Oriental Regions, and occurs in both Palaearctic and Oriental
China
.
Remarks:
Specimens of this species were misidentified and wrongly recorded from
China
as
Cryptochironomus chlorostolus
(Kieffer)
by
Wang
et al
. (1977)
.