Rheocricotopus serratus
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Ordo: Diptera
Familia: Chironomidae
Genus: Rheocricotopus
Name
Rheocricotopus serratus Liu, Lin & Wang, 2014 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Diagnosis
The adult male of the new species can be distinguished from known species of the species group and the genus by the following combination of characters: crista dorsalis sawtooth-shaped, hyaline, high as megaseta; high HR (2.61–3.42) and HV (3.40–5.00).
Description
Male imago (n = 4)
Total length 2.55–3.00, 2.73 mm. Wing length 1.33–1.95, 1.69 mm. Total length/wing length 1.44–1.94, 1.64. Wing length/length of profemur 2.21–2.35, 2.27.
Coloration. Head and abdomen yellow, thorax dark brown.
Head. AR 0.71–0.78, 0.74. Ultimate flagellomere 285–355, 323 μm long. Temporal setae 0–3, 1, including 0–1, 1 inner vertical; 0–2, 1 outer vertical and 0–1, 1 postorbital. Clypeus with 9–12, 10 setae. Tentorium 140–153, 148 μm long, 33–40, 38 μm wide. Stipes 65–75, 68 μm long, 3–7, 4 μm wide. Palpomere lengths (in μm): 35–70, 47; 48–58, 53; 103–123, 114; 118–155, 141; 205–238, 219. L: 5th/3rd 1.67–2.02, 1.92.
Wing (Fig. 12). Anal lobe slightly developed. VR 1.13–1.20, 1.17. Costal extension 50–88, 71 μm long. Brachiolum with 1 seta. R with 4–11, 7 setae. Remaining veins bare. Squama with 6–13, 9 setae. Thorax (Fig. 13). Antepronotum with 1–7, 4 lateral setae. Dorsocentrals 6–9, 7; acrostichals 9–15, 12; prealars 3. Scutellum with 4–6, 5 setae. Humeral pit moderately large, egg-shaped.
Legs. Spur of fore tibia 40–48, 44 μm long; spurs of mid tibia 15–25, 19 μm and 15–20, 17 μm long; spurs of hind tibia 43–55, 48 μm and 18–23, 19 μm long. Hind tibial comb with 11–13, 12 spines, 30–50, 40 μm long. Width at apex of fore tibia 35–45, 41 mm, of mid tibia 36–45, 41 mm, of hind tibia 38–45, 43 mm. Lengths (in μm) and proportions of legs as in Table 4.
| P1 | P2 | P3 | |
|---|---|---|---|
| fe | 600–830, 743 | 570–800, 700 | 600–780, 715 |
| ti | 650–810, 760 | 660–720, 698 | 660–850, 783 |
| ta1 | 520–780, 640 | 310–410, 380 | 380–530, 475 |
| ta2 | 290–390, 350 | 150–200, 183 | 200–270, 253 |
| ta3 | 205–270, 250 | 100–140, 125 | 160–220, 198 |
| ta4 | 155–200, 181 | 55–80, 71 | 90–120, 105 |
| ta5 | 90–100, 95 | 60–80, 73 | 70–90, 83 |
| LR | 0.78–0.96, 0.84 | 0.47–0.58, 0.54 | 0.58–0.63, 0.61 |
| BV | 2.39–2.55, 2.44 | 3.71–4.22, 3.96 | 2.17–3.04, 2.81 |
| SV | 1.95–2.61, 2.37 | 3.56–3.97, 3.69 | 2.92–3.32, 3.17 |
| BR | 1.75–2.11, 1.91 | 2.10–2.22, 2.19 | 2.40–3.55, 2.99 |
Type material
Holotype: ♂ (BDN. 10058), China, Yunnan Province, Dali Bai Autonomous Prefecture, Eryuan County, Niujie Town, 26°25'55"N, 99°98'90"E, light trap, Zhou CF. Paratypes (3): 1♂, Zhejiang Province, Qingyuan County, Baishanzu National Nature Reserve, 27°73'23"N, 119°19'06"E, 15.vii.1994, Ji BC; 1♂, Tibet, Xigaze, Nielamu County, 27°98'73"N, 85°98'32"E, 21.9.1987, light trap, Deng CY; 1♂, Sichuan Province, Xiangcheng County, 28°93'44"N, 99°79'72"E, 12.vi.1996, light trap, Wang XH.
Etymology
The specific name is an adjective, from Latin serratus, meaning sawtooth, referring to the sawtooth-shaped crista dorsalis.
Remarks
The new species resembles Rheocricotopus (Psilocricotopus) himalayensis Chaudhuri & Sinharay, 1983 in the triangular anal point, but it can be separated from the latter species on the basis of following characters: (1) costal extension of the new species much longer (50–88 μm), than Rheocricotopus (Psilocricotopus) himalayensis Chaudhuri & Sinharay (25 μm); (2) humeral pit in the new species medium, ovoid, which rounded in the latter species; (3) crista dorsalis sawtooth-shaped, hyaline in the new species, which moderately pronounced in the latter species.
Female and immature stages unknown.
Original Description
- Liu, W; Lin, X; Wang, X; 2014: A review of Rheocricotopus (Psilocricotopus) chalybeatus species group from China, with the description of three new species (Diptera, Chironomidae) ZooKeys, 388: 17-34. doi
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