<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 arquata Neubern sp. n. ( Figs 1 , 2 ) Type material. Holotype : ♂ , Brazil , Santa Catarina , Nova Teutônia , 52°42`42``W – 27°16`36``S , x.1970 , F. Plaumann — LEIA . Paratype : ♂ , same data as holotype— MZSP . Diagnostic characters. A. arquata sp. n. differs from other species mainly due to sharply curved blade aedeagal; truncated dorsal lobe. Etymology. From Latin, arquatus , meaning arched, referring to the shape of the aedeagal blade. Male (n = 2, unless otherwise stated): Dimensions : Total length 4.68–4.73 mm . Wing length 2.56–2.59 mm . Total length/wing length 1.81–1.85. Wing length/length of profemur 2.70–2.78. Coloration ( Fig. 1A–F , 2A ): wings and thorax follow figures 1A and 1B, respectively. Legs: P I –femur with 3 bands, tibia with 4 bands, the second small and incomplete band; P II, P III –femora with 2 bands, tibiae with 3 bands. Ratio of bands, related tibiae and tarsomeres 1 follow table 2. Hypopygium: gonocoxite apex and gonostylus base brown. TABLE 2. Ratio of bands, related tibiae and tarsomeres 1 of A. arquata sp. n. , ♂, (n=2).

A/B	LMB/LBCB	Y/Z
P I	0.52	0.22–0.25	0.46–0.47
P II	0.48–0.51	0.20–0.23	0.43–0.46
P III	0.46–0.47	0.25–0.26	0.43–0.52

Head : antenna with 14 flagellomeres; AR 1.77–1.78; apical flagellomere 142–143 µm long and subapical seta 41–43 µm long; temporals 43–45, postoculars 16; coronal triangle 150–153 µm long and base 91–93 µm; clypeus bearing 44–45 setae, 130–140 µm long and 118 µm wide; labrum with 5 setae, 115–135 µm long and 88 µm wide; tentorium 183–200 µm long; cibarial pump 390–399 µm long and orifice 70 µm from apex; palpomeres 1–5 : 63–67; 135–140; 170–190; 178–188; 245–247 µm long; palpomere 3 with sensilla capitata 54–58 µm from base. Wing ( Fig. 1A ): width/lenght 0.28 (n=1); VR 0.82–0.88; C 2.37–2.39 mm long; Sc 1.06–1.15 mm long; m-cu 37 µm long and 700–720 µm from arculus; fr 820–850 µm from arculus; R 3 apex close to C; brachiolum with 3 setae; squama with 39 (n=1) setae. Thorax ( Fig. 1B ): antepronotals 18; scutelars not discernible; humerals 11–14; prealars 25–28; supraalar 1. Legs ( Fig. 1D–F ): P I —apex of tibia 63 µm wide and with apical pectinated spur 65–72 µm long, spur ratio 0.54–0.61; tarsomeres 1–2 with 2 pseudospurs 55–66 µm long. P II —apex of tibia 59–60 µm wide and with 2 apical pectinated spurs 63–65 and 55–58 µm long, spur ratio 0.65–0.70 and 0.63–0.64 respectively; tarsomeres 1–2 with 3, 6 or 7 pseudospurs 55–79 µm long. P III —coxa without central microsetae; apex of tibia 77 µm wide and with 2 apical pectinated spurs 73–77 and 58–65 µm long, spur ratio 0.57 and 0.57–0.60 respectively; tarsomeres 1–3 with 2 or 10 pseudospurs 73–85 µm long. Lengths and proportions of leg segments table 3. TABLE 3. Lengths (in µm) and proportions of leg segments in A. arquata sp. n. , ♂, (n=2).

fe	ti	ta1	ta2	ta3	ta4
P I	922–969	1188–1219	955–960	617–620	455–460	307–310
P II	1094–1156	1188–1203	840–850	500–510	375–380	260
P III	969–984	1313–1422	1000–1188	645–650	507–510	333–334

TABLE 3. (Continued) ta 5 LR BV SV BR P I 174–180 0.79–0.80 1.97–2.0 2.21–2.28 2.0–2.10 P II 160–170 0.71 2.39–2.45 2.72–2.78 1.4–1.5 P III 161–170 0.76–0.84 1.99–2.15 2.03–2.28 2.0 Hypopygium ( Fig. 2A–D ): tergite IX with 2 central setae; anal point absent; phallapodeme 42 µm long; sternapodeme 113–127 µm long; gonocoxite 175–208 µm long and 113–128 µm wide; gonostylus 175–200 µm long, with 5 apical teeth; tapered megaseta; HR 1.0; HV 2.34–2.78. Aedeagal complex: grooved and arched aedeagal blade 50–51 µm long, base 13–15 µm, 9/10 8–9 µm; truncated dorsal lobe, 10 µm long, base 8 µm; lateral lobe and basidorsal lobe present. Female and immatures. Unknown.