<p> <strong> Neotropical <em> Ablabesmyia </ em> Johannsen (Diptera: Chironomidae, Tanypodinae) – Part I </ strong> </ p> Author Oliveira, Caroline Silva Neubern De csneubern@gmail.com Author Silva, Mário Antonio Navarro Da Author Gessner, Alaíde Aparecida Fonseca text Zootaxa 2013 2013-11-04 3733 1 1 123 http://dx.doi.org/10.11646/zootaxa.3733.1.1 journal article 10.11646/zootaxa.3733.1.1 1175-5326 5268657 EE758378-9459-4970-8D59-5258597A0E28 Ablabesmyia gigas Neubern sp. n. ( Figs 37 , 38 ) Type material. Holotype : ♂ , Brazil , São Paulo , Luís Antônio , Estação Ecológica Jataí , Piaba lake , 47°59`00``W – 21°34`00``S , 30.viii.1994 , S. T . Strixino — LEIA . Paratypes : 4 ♂♂ , same data, Infernão lake , 47°65`00``W– 21°34`00``S , 26.x.1993 , S. T . Strixino — DZUP ; 2 ♂♂ , São Paulo , Brotas , Dourada lake , 48°07`35``W – 22°17`12``S , 04.iii.2004 , L. Correia — LEIA ; 3 ♂♂ , same previous data,— DZUP ; 2 ♂♂ , Rio Grande do Sul , Arroio Grande , 53°05`13``W – 32°14`16``S , iii.1953 , S.J. Oliveira — LEIA ; 2 ♂♂ , same previous data—Fiocruz. Diagnostic characters. A. gigas sp. n. differs from other species by combination of the following characters: tapered megaseta, dorsal lobe absent, aedeagal blade with base 20 µm and 9/10 20–32.5 µm, anal point partially covers the aedeagal complex. Etymology. From Latin, gigas , meaning big, referring to the shape of the aedegal blade. Male (n = 5, unless otherwise stated): Dimensions : Total length 1.46–5.12 mm . Wing length 2.18–2.59 mm . Total length/wing length 1.38–2.33. Wing length/length of profemur 2.42–2.71. Coloration ( Figs 37A–E , 38A ): wings and abdomen follow figures 37A and 37E. Legs: P I –femora with 3 bands, tibiae with 3 bands; P II, P III —femora with 2 bands, tibiae with 3 bands. Ratio of bands, related tibiae and tarsomeres 1 follow table 26. Hypopygium: gonocoxite apex and gonostylus base brown. TABLE 26. Ratio of bands, related tibiae and tarsomeres 1 of A. gigas sp. n. , ♂, (n=5).

A/B	LMB/LBCB	Y/Z
P I	0.70–0.72	0.15–0.24	0.42–0.43
P II	0.56–0.65	0.19–0.23	0.35–0.45
P III	0.56–0.65	0.22–0.29	0.42–0.45

Head : antenna with 14 flagellomeres; AR 2.14–2.43; apical flagellomere 127–141 µm and subapical seta 33– 35 µm long; temporals 48–55; postoculars 16; coronal triangle 148 µm long and base 103–118 µm; clypeus bearing 21–40 setae, 115–130 µm long and 88–115 µm wide; labrum with 3 setae, 118–145 µm long and 60–75 µm wide; tentorium 165–178 µm long; cibarial pump 310–360 µm long and orifice 65–75 µm from apex; palpomeres 1–5 : 60– 77.5; 118–150; 153–165; 145–160; 280–320 µm long; palpomere 3 with sensilla capitata 39–55 µm from base. Wing ( Fig. 37A ): width/lenght 0.26–0.31; VR 0.80–0.87; C 1.96–2.04 mm long; Sc 1.21–1.34 mm long; m-cu 56 µm long and 650–750 µm from arculus; fr 750–940 µm from arculus; R 3 apex close to C; brachiolum with 4–5 setae; squama with 36–40 setae. Thorax : antepronotals 13–15; humerals 5–8; prealars 13–24; supraalar 1; scutelars 37–43. Legs ( Fig. 37B–D ): P I –apex of tibia 55–75 µm wide and with apical pectinated spur 67.5–80 µm long, spur ratio 0.50–0.69; tarsomeres 1–2 with 2 pseudospurs 57–69 µm long. P II –apex of tibia 56–82 µm wide and with 2 apical pectinated spurs 68–75 and 58–68 µm long, spur ratio 0.50–0.75 and 0.40–0.66 respectively; tarsomeres 1–3 with 1, 2 or 3 apical pseudospurs 66–78 µm long. P III –coxa with 6 central microsetae; apex of tibia 58–66 µm wide and with 2 apical pectinated spurs 65–80 and 60–68 µm long, spurs ratio 0.56–0.71 and 0.53–0.60 respectively, tarsomeres 1–3 with 2 apical pseudospurs 66–75 µm long. Lengths and proportions of leg segments table 27. TABLE 27. Lengths (in µm) and proportions of leg segments in A. gigas sp. n. , ♂, (n=5).

fe	ti	ta1	ta2	ta3	ta4
P I	900–969	1031–1281	829–984	562.5–656	406–490	250–330
P II	830–1078	1000–1422	906–1015	510–594	390–469	245–297
P III	800–1062.5	1125–1468	990–1328	594–730	440–530	300–340

TABLE 27. (Continued)

ta5	LR	BV	SV	BR
P I	165–190	0.76–0.83	1.92–1.99	2.14–2.33	1.6–1.9
P II	170–200	0.70–0.93	2.03–2.25	1.90–2.42	1.6–1.9
P III	175–280	0.88–0.95	1.90–2.15	1.68–2.21	1.6–4.2

FIGURES 37A–E. Ablabesmyia gigas sp. n. : adult male. (A) Wing; (B–D) P1 (B), P2 (C), P3 (D); (E) Abdomen. FIGURES 38A–D. Ablabesmyia gigas sp. n. : adult male. (A) Hypopygium: dorsal aspect; (B, C) Hypopygium: ventral aspect; (D) Aedeagal complex. Hypopygium ( Fig. 38A–D ): tergite IX with 2–3 central setae; anal point partially covers the aedeagal complex; phallapodeme 60–68 µm long; sternapodeme 140–153 µm long; gonocoxite 165–200 µm long and 130–140 µm wide; gonostylus 188–200 µm long, with 6–7 apical teeth, tapered megaseta; HR 0.85–1.04; HV 1.73–2.67. Aedeagal complex: grooved aedeagal blade 50–57.5 µm long, base 20 µm, 9/10 20–32.5 µm; dorsal lobe absent, lateral lobe and basidorsal lobe present. Female and immatures: unknown.