Rheocricotopus brochus
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Ordo: Diptera
Familia: Chironomidae
Genus: Rheocricotopus
Name
Rheocricotopus brochus Liu, Lin & Wang, 2014 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Diagnosis
The adult male can be distinguished from known species of the species group and the genus by the following combination of characters: crista dorsalis tooth-liked; tergites I, II and IV yellow, tergite III mainly yellow with a brown circular area, other tergites brown.
Description
Male imago (n = 12)
Total length 1.75–2.70, 2.18 mm. Wing length 1.25–1.60, 1.33 mm. Total length/wing length 1.35–1.78, 1.68. Wing length/length of profemur 1.76–2.31, 2.04.
Coloration. Head and thorax brown. Tergites (Fig. 1) I, II and IV yellow, tergite III mainly yellow but having a brown circular area, other tergites brown. Head. AR 0.63–0.89, 0.72. Ultimate flagellomere 245–360, 284 μm long. Temporal setae 4–7, 5, including 1–3, 2 inner verticals; 1–3, 2 outer verticals and 0–2, 1 postorbital. Clypeus with 7–10, 8 setae. Cibarial pump, tentorium and stipes as in Fig. 2. Tentorium 75–140, 123 μm long, 13–25, 19 μm wide. Stipes 100–125, 118 μm long, 8–10, 8 μm wide. Palpomere lengths (in μm): 20–25, 23; 38–55, 47; 90–130, 105; 110–138, 120; 205–250, 232. L: 5th/3rd 1.92–2.67, 2.23. Third palpal segment with 2 sensilla clavata.
Wing (Fig. 3). Anal lobe reduced. VR 1.06–1.13, 1.07. Costal extension 45–65, 51 μm long. Brachiolum with 1 seta. R with 3–6, 5 setae. Remaining veins bare. Squama with 1–2, 2 setae.
Thorax (Fig. 4). Antepronotum with 2–4, 4 lateral setae. Dorsocentrals 5–7, 6; acrostichals 9–13, 11; prealars 2–3, 3. Scutellum with 2–4, 4 setae. Humeral pit moderately large, ovoid.
Legs. Spur of fore tibia 23–40, 35 μm long; spurs of mid tibia 13–25, 15 μm and 10–18, 12 μm long; spurs of hind tibia 38–50, 41 μm and 10–20, 15 μm long. Hind tibial comb with 9–12, 10 spines, 20–48, 31μm long. Width at apex of fore tibia 35–45, 41 mm, of mid tibia 33–45, 41 mm, of hind tibia 30–45, 38 mm. Lengths (in μm) and proportions of legs as in Table 1.
| P1 | P2 | P3 | |
|---|---|---|---|
| fe | 530–924, 662 | 530–800, 713 | 570–820, 629 |
| ti | 640–860, 713 | 530–690, 670 | 660–870, 724 |
| ta1 | 570–770, 618 | 330–450, 362 | 410–550, 446 |
| ta2 | 310–420, 343 | 150–200, 161 | 180–260, 205 |
| ta3 | 210–300, 240 | 100–130, 110 | 150–210, 169 |
| ta4 | 150–200, 163 | 50–120, 63 | 70–100, 83 |
| ta5 | 70–95, 81 | 55–70, 57 | 60–80, 69 |
| LR | 0.83–0.90, 0.88 | 0.61–0.65, 0.63 | 0.60–0.63, 0.61 |
| BV | 2.32–2.52, 2.41 | 3.94–4.62, 4.10 | 3.30–3.49, 3.42 |
| SV | 2.07–2.32, 2.20 | 3.11–3.48, 3.26 | 2.95–3.07, 3.02 |
| BR | 2.00–4.00, 2.98 | 1.57–3.00, 2.51 | 2.25–3.25, 2.67 |
Type material
Holotype: ♂ (BDN. C11A32), China, Zhejiang Province, Yueqing City, Lingdi County, Jiulong Village, 28°31'00"N, 120°96'00"E, 18.iv.2011, sweeping, Lin XL. Paratypes (11): 4♂♂, as holotype; 6♂♂, Hubei Province, Hefeng County, 29°91'00"N, 110°03'00"E, 16.vii.1999, light trap, Ji BC; 1♂, Jiangxi Province, Wuyi Mountain National Nature Reserve, 27°48'11"N, 117°39'30"E, 13.vi.2004, light trap, Yan CC.
Etymology
The specific name is an adjective, from Latin brochus, meaning tooth, referring to tooth-shaped crista dorsalis.
Remarks
The new species resembles Rheocricotopus (Psilocricotopus) bifasciatus Wang & Zheng, 1991 and Rheocricotopus (Psilocricotopus) insularis Makarchenko & Makarchenko, 2005 in the following combination of characters: anal point long, pointed distally; wing anal lobe reduced; crista dorsalis tooth-shaped. But the new species can be separated from the latter species in the basis following combination of characters in Table 2.
| Rheocricotopus (Psilocricotopus) brochus sp. n. | Rheocricotopus (Psilocricotopus) bifasciatus | Rheocricotopus (Psilocricotopus) insularis | |
|---|---|---|---|
| AR | 0.63–0.89, 0.72 | 0.90 | 0.71–0.74 |
| Length of costal extension | 45–65, 51 μm | 83 μm | 96 μm |
| Squama | 1–2, 2 setae | 2 setae | 8 setae |
| Shape of humeral pit | medium, oviod | large, rounded | oviod |
| Tergite coloration | TI, II, IV yellow, TIII with a brown circular area, others brown | TI, II, IV yellow, others brown | all tergites brown |
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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