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 )

mengmanense sp. n. parallelum sp. n. pollicium sp. n. quadriguttatum scalaenum trapezium sp. n. udominutum unifascia fe 550—580 462—473 525 660 557—700, 623 630 540—580 470—630, 550 ti 350—360 263—284 315 415 305—390, 339 389 310—330 245—360, 312 ta1 670—740 546 536 740 672—810, 729(5) 840 690—700 580—740, 670 ta2 430—470 294 315 470 410—510, 455(5) 515 370—380 340—470, 404 ta3 320—330 221 231 360 305—380, 347(5) 368 270—280 270—370, 320 ta4 205—250 179 168 260 231—270, 254(5) 294 190—200 200—280, 240 ta5 125—130 95 106 140 116—137, 125(5) 147 80—100 100—150, 119 LR 1.91—2.11 2.08 1.7 1.78 2.00—2.27, 2.18(5) 2.16 2.19—2.23 1.97—2.38, 2.13 fe 630—640 578—588 578 760 630—800, 708 704 630—690 550—750, 640 ti 490—510 368—378 410 610 473—590, 516 567 490—510 350—510, 439 ta1 260—280 212—242 217 350 265—340, 291 - 260—300 200—300, 243 ta2 150—165 101—154 117 200 137—186, 161 - 155—175 105—160, 135 ta3 100—105 101—143 85 140 101—130, 116 - 120—130 75—115, 100 ta4 65—70 68—85 58 85 58—80, 70 - 70—75 50—75, 62 ta5 50—55 46 48 65 48—65, 55 - 55—65 45—65, 52 LR 0.53—0.55 0.54—0.56 0.53 0.57 0.54—0.58, 0.57 0.53—0.59 0.52—0.59, 0.55 fe 690—700 610 630 760 645—850, 722 735 650—700 570—790, 670 ti 570—600 441 494 710 536—690, 615 630 590—610 430—630, 529 ta1 380—410 294 315 510 378—490, 421 - 380—410 300—440, 346 ta2 210—220 148 180 290 210—280, 233 - 200—240 160—225, 196 ta3 170—180 148 148 230 179—200, 192 - 180—195 140—205, 176 ta4 105—110 95 90 130 100—120, 111 - 110—115 85—125, 108 ta5 60—65 69 48 80 63—80, 69 - 70—75 55—80, 67 LR 0.67—0.68 0.67 0.64 0.72 0.68—0.71, 0.70 - 0.64—0.68 0.63—0.76, 0.70

P1 P2 P3

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; R1 with 4–8, 6; R4+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.

Figures

FIGURE 1 A – D. Polypedilum (Tripodura) absensilobum Zhang & Wang sp. n. A. Wing. B. Fore tibial scale. C. Superior volsella. D. Hypopygium, dorsal and ventral view.

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	488 – 588, 540(8)	660 – 700, 680(3)	570 – 1050, 838	430 – 500, 450	640 – 800, 720	630 – 903, 816(7)	767 – 935, 832(11)
P1	ta2 ta3	263 – 347, 289 168 – 231, 197	249 – 305, 276(8) 201 – 284, 224(8)	380 – 420, 403(3) 250 – 310, 282(3)	460 – 620, 502 250 – 420, 349	255 – 270, 263 215 – 230, 228	380 – 500, 435 270 – 320, 295	347 – 567, 497(6) 305 – 431, 386(6)	515 – 609, 548(11) 458 – 589, 528(11)
	ta4	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)
	ta5	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)
	fe	452 – 546, 479	473 – 588, 538	730 – 840, 786	620 – 1025, 837	450 – 480, 464	700 – 820, 753	578 – 819, 727	683 – 861, 752(12)
	ti	305 – 378, 326	305 – 378, 343	560 – 630, 596	460 – 800, 657	310 – 330, 320	540 – 670, 585	420 – 672, 551	536 – 683, 595(12)
	ta1	170 – 221, 190	175 – 242, 199	290 – 325, 309(4)	250 – 440, 349	195 – 215, 203	280 – 360, 315	231 – 347, 303	336 – 441, 389(11)
P2	ta2 ta3	85 – 106, 94 58 – 74, 68	85 – 111, 98 58 – 74,66	150 – 190, 169(4) 105 – 125, 110(4)	140 – 245, 195 100 – 170, 135	90 – 105, 96 65 – 70, 68	155 – 200, 173 105 – 140, 120	137 – 191, 167 85 – 138, 116	186 – 249, 213(11) 90 – 175, 146(11)
	ta4	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)
	ta5	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)
	ta1	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)
P3	ta2 ta3	133 – 147, 140 117 – 137, 123	126 – 179, 151 126 – 158, 149	210 – 230, 220(2) 190 – 200, 195(2)	190 – 340, 265 165 – 265, 220	140 – 150, 145 120 – 135, 126	220 – 270, 237 180 – 220, 194	189 – 273, 238 164 – 242, 206	263 – 336, 293(9) 210 – 273, 233(8)
	ta4	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)
	ta5	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)

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