Metriocnemus calcaneum
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Ordo: Diptera
Familia: Chironomidae
Genus: Metriocnemus
Name
Metriocnemus calcaneum Li & Wang, 2014 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype male (BDN No. 08832), CHINA: Hebei Province, Pingquan County, Guangtou Mountain, 41°1'43"N, 118°43'1"E, 29.vi.1995, light trap, W. Bu. Paratype male (BDN No. 08816), as holotype except the date is 28.vi.1995.
Diagnostic characters
The gonostylus is 83–90 µm long, with short, strong outer projection; crista dorsalis is strong and pointed; LR1 is high (0.68–0.70); squama with 8–10 setae; and cell m basally of RM with 15 setae.
Etymology
From Latin, calcaneum meaning the heel, referring to the short, strong outer projection on gonostylus. The species epithet is a noun in apposition.
Description
Male (n = 2).
Total length 2.49–2.68 mm. Wing length 1.68–1.88 mm. Total length / wing length 1.43–1.48. Wing length / length of profemur 2.09–2.23.
Coloration. Head and abdomen brown, thorax and legs yellow.
Head. AR 1.43–1.58. Temporal setae 11, including 4 inner verticals, 3 outer verticals, and 4 postorbitals. Clypeus with 10–12 setae. Tentorium 123–150 µm long, 18–20 µm wide. Stipes 105–108 µm long, 25–40 µm wide. Palp segments lengths (in µm): 18–40, 43, 135–155, 105–118, 153–165. Length ratio of palpomere 5/3 1.06–1.13.
Wing (Fig. 1). VR 1.16–1.34. Costal extension 110–150 µm long. Brachiolum with 1 seta, C extension with 8 non–marginal setae, Sc with 2–3, R with 18–19, R1 with 16–17, R4+5 with 25–32, RM with 1, M with 0–2, M1+2 with 26, M3+4 with 20, Cu with 0, Cu1 with 7 setae. Pcu and An without setae. Wing membrane with setae in most cells, with 15 setae in cell m basally of RM, cell r4+5 with 74–105, cell m1+2 with 108–135, cell m3+4 with 21–38 setae. Squama with 8–10 setae. Thorax. Antepronotum with 1–2 setae. Dorsocentrals 10–12, acrostichals 8–9, prealars 5. Scutellum with 7–8 setae.
Legs. Spur of fore tibia 53–75 µm long, spurs of mid tibia 33–35 µm and 25–28 µm long, of hind tibia 53–58 µm and 28 µm long. Width at apex of fore tibia 38–43 µm, of mid tibia 35–43 µm, of hind tibia 45–50 µm. Comb of 12 setae, shortest 20–23 µm long, longest 50–63 µm long. First tarsomere of mid leg with 1 pseudospur, 20 µm long; hind leg without pseudospurs. Lengths (in µm) and proportions of legs as in Table 1.
| fe | ti | ta1 | ta2 | ta3 | ta4 | |
|---|---|---|---|---|---|---|
| p1 | 800–840 | 830–950 | 580–650 | 310–370 | 198–224 | 136–150 |
| p2 | 790–890 | 750–860 | 400–430 | 185–198 | 150–155 | 108 |
| p3 | 840–970 | 920–1060 | 520–570 | 242–264 | 185–220 | 114–123 |
| ta5 | LR | BV | SV | BR | ||
| p1 | 98–105 | 0.68–0.70 | 2.87–2.98 | 2.75–2.81 | 2.0 | |
| p2 | 88–98 | 0.50–0.53 | 3.63–3.94 | 3.85–4.07 | 2.44–3.3 | |
| p3 | 93–98 | 0.54–0.57 | 3.60–3.69 | 3.38–56 | 2.91–4.0 |
Distribution
The specimens were collected in Hebei Province in Palaearctic China.
Original Description
- Li, X; Wang, X; 2014: New species and records of Metriocnemus van der Wulp s. str. from China (Diptera, Chironomidae) ZooKeys, 387: 73-87. doi
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