Ablabesmyia gessnerae 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 : 59-64

Ablabesmyia gessnerae Neubern sp. n.

( Figs 33–36 )

Type material. Holotype: ♂ with larval and pupal exuviae, Brazil, São Paulo, São Carlos, Monjolinho river , 47°05`00``W – 22°01`00``S, 30.iii.2004, C.S.N. Oliveira — LEIA . Paratypes: ♂ with larval and pupal exuviae, same data holotype — LEIA ; 2 ♂♂ with larval and pupal exuviae, same data holotype — DZUP ; ♂ with pupal exuvia, São Paulo, São Carlos, Fazzari river , 47°52`00``W – 21°53`00``S, 10.iii.2005, T . Siqueira — LEIA .

Diagnostic characters. A. gessnerae sp. n. differs from other species by combination of the following characters: Male —antepronotum with 24–28 lateral setae, R 3 apex close to C, expanded megaseta, aedeagal complex with only one grooved aedeagal blade, dorsal lobe present; Pupa —apex of aeropyle tube T-shaped, lumen thoracic horn with hexagonal pattern only in the lateral, border anal lobe partially with spines and distal yellow; Larva —head capsule expanded and without spots, ligula teeth in concave arch, dorsal pore present, projections postoccipital margin present, palpal formula 0+2, procercus with 7 anal setae, posterior parapods with 2 claws brown.

Etymology. Named after Dra. Alaíde Aparecida Fonseca Gessner, that contributed to the development of this paper and also to the knowledge of Neotropical Chironomidae .

Male (n = 5, unless otherwise stated): Dimensions: Total length 4.02–4.28 mm. Wing length 1.87–1.93 mm. Total length/wing length 2.15–2.22. Wing length/length of profemur 2.25–2.33.

Coloration ( Figs 33A–E , 34A ): wings and abdomen follow figures 33A and 33E. Legs: P I, P II —femora with 2 bands, tibiae with 4 bands; P III —femora with 1 band, tibiae with 4 bands. Ratio of bands, related tibiae and tarsomeres 1 follow table 24. Hypopygium: gonocoxite apex brown and gonostylus yellow.

Head: antenna with 14 flagellomeres; AR 1.77–1.85; apical flagellomere 113–116 µm long and subapical seta 30–35 µm long; temporals 57–59; postoculars 9; coronal triangle 203–204 µm long and base 114–115 µm; clypeus bearing 29–33 setae, 75–95 µm long and 80–87 µm wide; labrum with 3 setae, 92–98 µm long and 45–59 µm wide; tentorium 169–175 µm long; cibarial pump 326–330 µm long and orifice 55 µm from apex; palpomeres 1–5: 71–72; 95–99; 134–136; 170–177; 230–240 µm long; palpomere 3 with sensilla capitata 27–33 µm from base.

Wing ( Fig. 33A ): width/lenght 0.30–0.32; VR 0.78–1.10; C 1.70–1.76 mm long; Sc 0.95–1.00 mm long; m-cu 49 µm long and 492–692 µm from arculus; fr 630–631 µm from arculus; R 3 apex close to C; brachiolum with 4 setae; squama with 44–46 setae.

Thorax: antepronotals 24–28; humerals 10; prealars 31–35; supraalar 1; scutelars 30–32.

Legs ( Fig. 33B–D ): P I —apex of tibia 60–61 µm wide and with apical pectinated spur 62–65 µm long, spur ratio 0.57–0.58; tarsomeres 1–3 with 1 or 2 pseudospurs 55–82 µm long. P II —apex of tibia 59–59 µm wide and with 2 apical pectinated spurs 68–70 and 48–50 µm long, spur ratio 0.45–0.50 and 0.52–0.55 respectively; tarsomeres 1–3 with 1 or 2 apical pseudospurs 65–77 µm long. P III —coxa with 5 central microsetae; apex of tibia 63–67 µm wide and with 2 apical pectinated spurs 71–72 and 54–55 µm long, spurs ratio 0.50–0.59 and 0.43–0.58 respectively; tarsomeres 1–3 with 1 or 2 apical pseudospurs 65–70 µm long. Lengths and proportions of leg segments table 25.

Hypopygium ( Fig. 34A–D ): tergite IX with 3 central setae; anal point completely covers the aedeagal complex; phallapodeme 45–56 µm long; sternapodeme 124–154 µm long; gonocoxite 157–185 µm long and 87–126 µm wide; gonostylus 166–169 µm long, with 6 apical teeth, expanded megaseta; HR 0.93–1.11; HV 2.38–2.58. Aedeagal complex: grooved aedeagal blade 35–37 µm long, base 20 µm, 9/10 3 µm; dorsal lobe 14–20 µm long and base 15–18 µm; lateral lobe and basidorsal lobe present.

Female: unknown.

Pupa (n = 5, unless otherwise stated): Dimensions: male abdomen 3.35–3.73 mm long.

Coloration ( Fig. 35A–D ): exuviae brown, wing sheath with spots.

Cephalothorax ( Fig. 35A, B ): wing sheath 1.38–1.51 mm long and with complete veins; thoracic horn 438–469 µm long and 180–200 µm wide, lumen with hexagonal pattern only in the lateral, spines present on the base and border, apex of aeropyle tube T-shaped; thoracic comb with 18 conical teeth.

Abdomen ( Fig. 35C, D ): shagreen as small spines in arc, present in A I–VIII; scar in A I 190–200 µm long; A IV chaetotaxy follow figure 35C, dorsal pore between setae D 1 and D 3; A VII with 4 lateral setae, LS 1 200–218 µm long; A VIII with 5 lateral setae, LS 1 94–125 µm long; anal lobe 406–439 µm long, base 382–438 µm wide, with 2 anal macrosetae, LS 1 188–194 µm long, LS 2 225–254 µm long, outer border with spines; genital sac shorter than the anal lobe, 319–346 µm long; GS/AL 0.78–0.79

Larva (n = 4, unless otherwise stated): Dimensions: head capsule 745–813 µm long and 575–631 µm wide.

Coloration ( Fig. 36A–D ): head capsule yellow; postoccipital margin brown; ligula teeth brown; procercus brown; posterior parapod with 16 claws, 2 hooked claws brown and 14 simple claws yellow.

Head Capsule ( Fig. 36A–C ): expanded, IC 0.76–0.78, postoccipital margin with central projections, chaetotaxy follow the figure 36A; AR 4.10–4.42, antennomeres 1,2-4: 406–469, 99–106 µm long; ring organ in A 1 248–250 µm from the base; maxillary palp with 2 segments, palpomeres 1-2: 33–40, 43–55 µm long; palpal formula 0+2, P 1 /P 2 0.64–0.77, A 1 /P 1 11.71–12.31, A 2 /P 1 2.38–2.70; mandible 132–154 µm long, with campaniform sensillum 28–31 mm from the base, A 1 /MD 2.64–3.60; dorsomental tooth 51–54 mm long and far apart 73–77 mm, pseudoradula slightly granulated and with homogeneous width; ligula 108–111 mm long and 52–66 mm wide, with 5 teeth in concave arch, It/O 0.86–0.95; Mt/O 0.71–0.79; It/Li 0.17–0.26; muscle attachment of ligula 31–35 µm long and 71–80 mm wide; bifid paraligula 54–60 µm long, pectin hypopharyngis with 18 teeth.

Abdomen ( Fig. 35D ): procercus 100–108 µm long and 37–38 µm wide, 7 anal setae 620–625 µm long; supraanal seta simple and 520–524 µm long; supraanal seta lenght/ anal setae lenght 0.84; posterior parapods with 14 simple claws, with the serrated slightly sides and 2 hooked claws with the smooth sides, claw with truncated base absent, tip of posterior parapods with little spines.

Figures

FIGURES 33A–E. Ablabesmyia gessnerae sp. n.: adult male. (A) Wing; (B–D) P1 (B), P2 (C), P3 (D); (E) Abdomen.

FIGURES 34A–D. Ablabesmyia gessnerae sp. n.: adult male. (A) Hypopygium: dorsal aspect; (B, C) Hypopygium: ventral aspect; (D) Aedeagal complex.

FIGURES 35A–D. Ablabesmyia gessnerae sp. n.: pupa. (A) Wing; (B) Thoracic horn; (C) Abdominal segments 1–5, with chaetotaxy of segment 4, right: ventral aspect, left: dorsal aspect; (D) Abdominal segments 6–8 and anal lobe with male genital sac, right: ventral aspect, left: dorsal aspect.

FIGURES 36A–D. Ablabesmyia gessnerae sp. n.: larva. (A) Head with chaetotaxy, right: ventral aspect, left: dorsal aspect; (B) Maxillary palp; (C) Ligula, paraligula and pecten hypopharyngis; (D) posterior parapod.