Polypedilum (Tripodura) absensilobum Zhang & Wang

Zhang, Ruilei, Song, Chao, Qi, Xin & Wang, Xinhua, 2016, Taxonomic review on the subgenus Tripodura Townes (Diptera: Chironomidae: Polypedilum) from China with eleven new species and a supplementary world checklist, Zootaxa 4136 (1), pp. 1-53 : 3-7

Polypedilum (Tripodura) absensilobum Zhang & Wang sp. n.

( Figure 1)

ta 4 116 – 168, 145 147 – 179, 162 (8) 200 – 240, 218 (3) 220 – 360, 289 155 – 165, 160 210 – 260, 238 231 – 315, 287 (6) 284 – 357, 311 (11) ta 5 74 – 95, 84 74 – 95, 84(8) 110 – 120, 113 (3) 110 – 170, 129 75 – 100, 84 110 – 130, 120 105 – 147, 132 (6) 137 – 168, 150 (11) LR 2.09 – 2.25, 2.17 2.04 – 2.26, 2.17 (8) 1.60 – 1.84, 1.69 (3) 1.61 – 2.10, 1.79 1.91 – 2.23, 2.02 1.58 – 1.78, 1.66 2.08 – 2.50, 2.30 (7) 1.74 – 2.00, 1.88 (11) ta 3 58 – 74, 68 58 – 74,66 105 – 125, 110 (4) 100 – 170, 135 65 – 70, 68 105 – 140, 120 85 – 138, 116 90 – 175, 146 (11) ta 4 37 – 42, 40 32 – 48, 42 75 – 85, 79(4) 70 – 110, 90 40 – 45, 43 70 – 95, 80 53 – 85, 69 74 – 101, 87(11)

ta 5 37 – 42, 40 37 – 53, 46 60 – 70, 66(4) 60 – 90, 72 35 – 45, 40 60 – 75, 67 42 – 64, 53 53 – 74, 63(11)

LR 0.55 – 0.61, 0.57 0.53 – 0.62, 0.57 0.49 – 0.54, 0.52 (4) 0.47 – 0.58, 0.53 0.63 – 0.66, 0.64 0.51 – 0.56, 0.54 0.50 – 0.61, 0.55 0.60 – 0.69, 0.65 (11) fe 441 – 546, 483 494 – 609, 558 770 – 900, 830 (4) 650 – 1100, 904 440 – 480, 458 740 – 880, 805 609 – 872, 771 704 – 924, 790 (12) ti 336 – 441, 375 389 – 483, 440 620 – 730, 683 (4) 520 – 870, 740 360 – 410, 380 620 – 750, 668 83 – 735, 642 609 – 777, 675 (12) ta 1 212 – 273, 236 242 – 305, 273 450 – 470, 460 (2) 370 – 680, 533 250 – 275, 260 430 – 560, 493 336 – 536, 457 452 – 599, 508 (9) 3 ta 2 133 – 147, 140 126 – 179, 151 210 – 230, 220 (2) 190 – 340, 265 140 – 150, 145 220 – 270, 237 189 – 273, 238 263 – 336, 293 (9) ta 3 117 – 137, 123 126 – 158, 149 190 – 200, 195 (2) 165 – 265, 220 120 – 135, 126 180 – 220, 194 164 – 242, 206 210 – 273, 233 (8) ta 4 58 – 74, 66 80 – 105, 91 110 – 120, 115 (2) 100 – 175, 136 75 – 90, 81 115 – 135, 124 95 – 147, 120 126 – 147, 133 (8) ta 5 37 – 53, 48 53 – 74, 59 70 – 80, 75(2) 75 – 105, 90 50 – 55, 53 75 – 95, 83 42 – 84, 66 74 – 84, 77(8)

LR 0.61 – 0.63, 0.62 0.58 – 0.73, 0.63 0.70 – 0.73, 0.72 (2) 0.66 – 0.79, 0.72 0.66 – 0.71, 0.68 0.68 – 0.75, 0.71 0.68 – 0.75, 0.71 0.72 – 0.78, 0.76 (8)

…… continued on the next page Type material. Holotype: male (BDN. 20688), CHINA, Fujian Province, Jianning County, the forestry bureau of county town, 26. IX. 2002; light trap, Z. Liu. Paratypes: 3 males as the holotype; 4 males, Fujian Province, Yongtai County, the forestry bureau of county town, 17. IX. 2002; light trap, Z. Liu; 1 male, Hainan Province, Lishui County, Diaoluo Town. 20. V. 1988, light trap, X. Wang.

Etymology. From Latin, absens, absent, and lobus, lobe, referring to the extremely reduced wing anal lobe.

Diagnostic characters. The species is separated from other members within the subgenus by the wing without marking, the squama with a few setae (1–3), the anal lobe extremely reduced, low AR (0.33–0.59), the high VR and the anal point without lateral projection.

Male imago (n= 5). Total length 1.36–1.85, 1.60 mm. Wing length 0.86–1.05, 0.94 mm. Total length/ wing length 1.45–1.97, 1.70. Wing length/ length of profemur 2.21–2.44, 2.35.

Coloration. Head brown with yellow palpomere. Thorax ground color yellowish brown with postnotum, epimeron II, hind anepisternum II and hind margin of preepisternum dark brown, halteres yellow. All femora brown with a pale middle ring; all tibiae with yellow basal part and brown apices; fore tarsus brown, mid and hind tarsi yellow. Abdominal segments entirely yellowish brown.

Head. AR 0.33–0.59, 0.45. Ultimate flagellomere 147–231, 179 µm long. Temporal setae 7 –8, 8, including 2 – 3, 2 inner verticals, 2 –3, 3 outer verticals and 2 –2, 2 postorbitals. Clypeus with 10 –11, 10 setae. Tentorium 68 –91, 80 µm long, 10 –13, 11 µm wide. Palpomere lengths (in µm): 18 –29, 22; 18 –26, 21; 44 –55, 51; 57 –70, 65; 94–114, 102.

Wing ( Figure 1 A). VR 1.45–1.47, 1.46. R with 7 –10, 9 setae; R 1 with 4 –8, 6; R 4 + 5 with 13 –17, 14. Squama with 1 –3, 2 setae. Anal lobe extremely reduced, wing without marking.

Thorax. Dorsocentrals 6 –10, 8; acrostichals 8 –10, 9; prealars 3 –4, 3. Scutellum with 2 –4, 3 setae.

Legs. Terminal scale ( Figure 1 B) of front tibia 18 –26, 21 µm long, triangular and pointed apically. Spur of middle tibia 29 –31, 30 um long including 13 –18, 16 µm long comb, un-spurred comb 13 –18, 16 µm long, spur of hind tibia 34 –39, 36 µm long including 18 –23, 20 µm long comb, un-spurred comb 13 –26, 18 µm long. Width at apex of front tibia 29 –31, 30 µm, of middle tibia 26 –34, 30 µm, of hind tibia 31 –42, 35 µm. Lengths (in µm) and proportions of legs as in Table 1.

Hypopygium ( Figure 1 C, D). Tergite IX with 3 –5, 4 median setae. Laterosternite with 1 –2, 2 setae. Anal point broad, 36 –42, 38 µm long, without lateral projection. Phallapodeme 34 –42, 37 µm long; transverse sternapodeme 21 –23, 22 µm long. Gonocoxite 73 –86, 82 µm long. Superior volsella ( Figure 1. C) pad–like, expanded distally, with 2–3 short inner setae and 2 long setae on outer apical margin. Inferior volsella 52 –65, 61 µm long, gradually tapered from base to apex, with 5–7 oral setae and an apical seta. Gonostylus 73 –91, 81 µm long, with 3–4 long setae along inner margin. HR 0.95–1.11, 1.03. HV 1.72–2.12, 1.92.

Distribution. The species was collected from Oriental China.

Remarks. The new species is close to Neotropical species P. (T.) atroari , P. (T.) carijona , P. (T.) karyana and P. (T.) kuikuro described by Bidawid & Fitttkau (1995) and Bidawid-Kafka (1996) in have no wing marking and no projection on each side of the anal point. The morphological differences between them see table 2.

Tables

TABLE 1. Lengths (in µm) and proportions of legs.

absensilobum sp.n	apiculusetosum sp.n.	arcuatum sp. n.	bilamella sp.n.	conghuaense sp. n.	dengae sp.n.	japonicum	masudai
fe 378 – 452, 399	410 – 483, 450	600 – 660, 624	510 – 810, 695	340 – 380, 363	560 – 700, 625	536 – 756, 671	620 – 788, 682(12)
ti 200 – 263, 224	221 – 273, 247	380 – 470, 431	340 – 580, 470	210 – 235, 221	380 – 490, 422	273 – 420, 331	382 – 536, 446(12)
ta1 441 – 557, 483 ta2 263 – 347, 289 1 ta3 168 – 231, 197	488 – 588, 540(8) 249 – 305, 276(8) 201 – 284, 224(8)	660 – 700, 680(3) 380 – 420, 403(3) 250 – 310, 282(3)	570 – 1050, 838 460 – 620, 502 250 – 420, 349	430 – 500, 450 255 – 270, 263 215 – 230, 228	640 – 800, 720 380 – 500, 435 270 – 320, 295	630 – 903, 816(7) 347 – 567, 497(6) 305 – 431, 386(6)	767 – 935, 832(11) 515 – 609, 548(11) 458 – 589, 528(11)