Microchironomus deribae Freeman
Creators: name: Yan, Chuncai
name: Wang, Xinhua
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Microchironomus
Microchironomus deribae

description: 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
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.
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).
description: Published as part of Yan, Chuncai & Wang, Xinhua, 2006, Microchironomus Kieffer from China (Diptera: Chironomidae), pp. 53-68 in Zootaxa 1108 on pages 56-59, DOI: 10.5281/zenodo.171476