Ablabesmyia gigas Neubern, 2013

Oliveira, Caroline Silva Neubern De, Silva, Mário Antonio Navarro Da & Gessner, Alaíde Aparecida Fonseca, 2013, <p> <strong> Neotropical <em> Ablabesmyia </ em> Johannsen (Diptera: Chironomidae, Tanypodinae) – Part I </ strong> </ p>, Zootaxa 3733 (1), pp. 1-123 : 64-68

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.

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.

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.

Figures

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.