Polypedilum (Cerobregma) paucisetum, Zhang, Ruilei, Wang, Xinhua & Saether, Ole A., 2006

Zhang, Ruilei, Wang, Xinhua & Saether, Ole A., 2006, Two unusual species of Polypedilum Kieffer (Diptera: Chironomidae) from Oriental China, Zootaxa 1282, pp. 39-48 : 40-43

publication ID

https://doi.org/ 10.5281/zenodo.173435

DOI

https://doi.org/10.5281/zenodo.5629579

persistent identifier

https://treatment.plazi.org/id/03DB6553-FFD3-236A-FEBE-3672FCDBB4D3

treatment provided by

Plazi

scientific name

Polypedilum (Cerobregma) paucisetum
status

sp. nov.

Polypedilum (Cerobregma) paucisetum View in CoL sp. n.

( Figs. 1–7 View FIGURES 1 – 7 )

Type material

Holotype male, CHINA: Guangdong Province, Fengkai County, Heishiding Natural Reserve, 20.iv.1988, light trap, X. Wang (BDN No.: 05921). Paratypes: 9 males as holotype; 2 males, Guizhou Province, Fanjing Mountain Natural Reserve, Huoguo Temple, 3.viii.2001, light trap, R. Zhang; 3 males, Guizhou Province, Jiangkou County, 27.vii.2001, light trap, R. Zhang; 1 male, Guizhou Province, Luodian County, 420 m a.s.l., 7.viii.1995, light trap, W. Bu; 1 male, Yunnan Province, Mengla County, Menglun Township, 12.iv.1987, H. Zou.

Diagnostic characters

The species has an Uresipedilum ­like superior volsella, which is unique in the subgenus Cerobregma . The low number of anal tergite setae and the setae along inner margin of the gonostylus being not­split, will separate the species from other members of the subgenus.

Description

Male (n = 10 except when otherwise stated). Total length 2.59–3.38, 2.99 mm. Wing length 1.62–2.13, 1.93 mm. Total length / wing length 1.43–1.67, 1.55. Wing length / length of profemur 1.95–2.21, 2.11.

Coloration. Head brown. Thorax brown with darker vittae, postnotum and preepisternum. Abdominal segments entirely brown or tergites II–V brown with pale posterior margins. Legs and wings uniformly brown.

Head. AR 0.54–0.91, 0.72. Ultimate flagellomere 368–525, 441 m long. Temporal setae 11–18, 16; including 3–10, 7 inner verticals; 4–9, 7 outer verticals and 1–3, 2 postorbitals. Clypeus with 16–30, 22 setae. Tentorium 107–143, 117 m long, 36–52, 43 m wide. Palpomere lengths (in m): 31–47, 39; 49–57, 52; 104–146, 121; 109–151, 130; 177–252, 211.

Wing ( Fig. 1 View FIGURES 1 – 7 ). VR 1.14–1.32, 1.23. Brachiolum with 1 seta; R with 18–29, 23; R1 with 20–35, 29; R4+5 with 34–67, 50; RM with 0–3; M with 0–2 setae. Squama with 11–19, 16(8) setae.

Thorax. Antepronotals and scutal tubercle absent. Dorsocentrals 12–23, 18; acrostichals 9–19, 14; prealars 5–11, 8. Scutellum with 11–19, 15 setae.

Legs. Terminal scale ( Fig. 2 View FIGURES 1 – 7 ) of front tibia triangular, 44–70, 57 m long with small spine; spur on median tibiae 52–68, 62 m long including 23–34, 30 m long comb, unspurred comb 18–34, 25 m long; spur on posterior tibia 57–78, 67 m long including 29–52, 37 m long comb, un­spurred comb 23–36, 29 m long. Width at apex of front tibia 49–65, 56 m; of mid tibia 52–68, 58 m; of hind tibia 55–73, 65 m. Lengths (in m) and proportions of legs as in Table 1 View TABLE 1 .

Hypopygium ( Figs. 3–7 View FIGURES 1 – 7 ). Anal tergite bands strongly developed, fused basally and apically, completely surrounding 1–5, 3 strong median anal tergite setae. Laterosternite with 2–3, 3 setae. Anal point 62–100, 79 m long, tapering. Phallapodeme 81–108, 97 m long; transverse sternapodeme 26–55, 37 m long. Gonocoxite 130–168, 152 m long with bulb­like apicolateral extension. Superior volsella ( Figs. 3–5 View FIGURES 1 – 7 ) not projecting posteriorly, base with 2–4 inner and 2–4 apical setae, with microtrichiae; apicomedial projection long, slender, with sharply pointed apex. Inferior volsella apically split in 3 lobes with 20–27 not­split subapical setae and an apical seta. Gonostylus 120–165, 139

m long, with long, not­split setae along inner margin. HR 0.98–1.20, 1.09. HV 1.88–2.29, 2.14.

Remarks

In this new species, the basal portion of the superior volsella is low and broad, the apical processes arise from the inner margin of its base and are directed inwards, which are typical in the subgenus Uresipedilum Oyewo and Saether. The superior volsella is somewhat similar to the volsellae of P. (C.) bulbocaudatum Saether and Sundal , P. (C.) subulatum Saether and Sundal ( Saether & Sundal 1999: Figs. 43–44) and P. (C.) okigrandis Sasa ( Sasa 1993: Fig. 10.5). However, in these three species the apical process of the superior volsella arise from the outer margin of its base. In the new species neither the setae along the inner margin of the gonostylus nor any setae of the inferior volsella are split, which separate it from most other members of the subgenus Cerobregma . However, according to the descriptions both P. (C.) kamotertium Sasa (Sasa 1989: 64) and P. (C.) okigrandis lack split setae. Saether and Sundal (1999), however, assumed that the branching of the setae had been overlooked. Kobayashi et al. (2003) showed that this is indeed the case at least in P. (C.) kamotertium .

TABLE 1. Lengths (in m) and proportions of legs of Polypedilum (Cerobregma) paucisetum sp. n., male (n = 8 – 14).

  fe ti ta1 ta2 ta3 ta4 ta5 LR
p1 830–1040, 917 546–630, 592 956–1215, 1097 641–783, 712 441–525, 483 368–473, 423 179–221, 196 1.75–1.93, 1.85
p2 977–1242, 1096 777–972, 875 399–515, 451 242–326, 284 189–242, 220 133–186, 155 80–106, 94 0.48–0.56, 0.51
p3 987–1323, 1159 830–1053, 942 578–756, 644 336–441, 391 315–410, 354 221–273, 219 95–137, 113 0.64–0.72, 0.69

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Chironomidae

Genus

Polypedilum

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