Ablabesmyia tucuxi Neubern et Fusari, sp. n.
Creators: name: Fusari, Lívia Maria
name: Neubern, Caroline S.
name: Hamada, Neusa
name: Roque, Fabio O.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Ablabesmyia
Ablabesmyia tucuxi

description: Ablabesmyia tucuxi Neubern et Fusari sp. n.
(Figs 1–19)
Type material. Holotype: ♂, BRAZIL, Roraima, Boa Vista municipality, Cauamé River, (slide mounted in Euparal), 02°52’06”N 60°44’24”W, 28–30.v.2009, L. M. Fusari & A. Fernandes (INPA). Paratypes: 2 ♂, 2 pharate pupae, 2 pharate pupae with larval exuviae (MZUSP); 2 ♂, 2 pharate pupae, 2 pharate pupae with larval exuviae (INPA); 5 larvae (MZUSP), 6 larvae (INPA), same data as holotype. Bonfim municipality, Igarapé Arraia, 03°21’01”N 59°54’14”W, 22.iii.2001, S. R. M. Couceiro, 6 larvae (INPA).
Diagnostic characters. Ablabesmyia tucuxi differs from other species by the combination of the following characters. Male - colored legs, tapered megaseta, grooved aedeagal blade and small dorsal lobe; Pupa - thoracic horn with respiratory atrium and with hexagonal pattern; aeropyle tube apex club-shaped; tergite VII without lateral setae. Larva - conic head and exclusive chaetotaxy; ligula with 5 small teeth on each side; A1 and maxillary palp length; palpal formula 2+0; posterior parapods apex without hooklets, 3 hooked claws and 2 small claws situated among the large claws.
Etymology. Informal name given to inhabitants of the Brazilian state of Roraima; the name is to be regarded as a noun in apposition.
Male (n = 5, unless otherwise stated)
Dimensions: Total length [3.60]– 3.74 mm. Wing length [1.50]– 1.66 mm. Total length/wing length 2.25–[2.40]. Wing length/length of profemur [2.11]–2.20.
Coloration (Figs 1, 4, 5): wing with dark spots. Leg: fore leg - femur with 3 bands, tibia with 5 bands; mid leg and hind leg - femur with 3 bands, tibia with 4 bands. Length and proportion of bands on legs as in Table 1. Abdomen like as in Figure 5.
A/B LMB/LBCB Y/Z
P I 0.65–0.75 1.21–2.25 0,37–0,43 P II 0.64–0.73 1.0–1.27 0.33–0.38 P III 0.60–0.64 0.59–0.82 0.36–0.41 Head (Fig 2): antenna with 13 flagellomeres, AR [1.89] 1.80–2.0, apical flagellomere 94–[106] μm long, subapical seta [36] μm long (n=1). Temporal seta 20–[29] long. Tentorium [185]–208, μm long, stipes not measurable. Clypeus [92]–111 μm long, [110] 95–111 μm wide at widest point, bearing [21]–24 setae. Cibarial pump with anterior margin concave, [254]–280 μm long and with orifice [46]–58 from apex. Labrum [63]–86 μm long, [76] 68–77 μm wide and with 3 setae. Palpomeres1–5 lengths (μm): [45]–52; [90] 88–98; [126] 125–134; [128] 125–134; [200]; palpomere3 with sensilla capitata 34–[37] μm from base.
Thorax (Fig 3): antepronotum with [17]–19 lateral setae; acrostichals and dorsocentrals not discernible; prealars [17]–18; supraalars [1]; scutelars [23]–34.
Wing (Fig 1): width 0.45–[0.46] μm, width/length [0.28]–0.31. C [1.43] 1.42–1.44 mm long, not protruding beyond R4+5. Sc 0.75–0.82 mm long. VR [0.83]–0.85. MCu [437.5] 430–480 μm from arculus. Brachiolum with [3]–4 setae. Squama with 27 setae (n = 1).
Legs (Fig 4): Fore leg - apex of tibia [52]–75 μm wide and with 1 apical pectinated spur [49]–56 μm long, spur ratio 0.50–[0.56]. Mid leg - apex of tibia [54]–69 μm wide and with 2 apical pectinated spurs [61.5]–71 and [40]– 48.5 μm long, spurs ratio [0.45] 0.42–0.51 and 0.42–[0.77]. Hind leg - apex of tibia [60]–70 μm wide and with 2 apical pectinated spurs [63]–70 and [43]–60 μm long, spur ratio 0.49–[0.54] and 0.45–[0.57]. Lengths and proportions of leg segments as in Table 2.
fe ti ta1 ta2 ta3 ta4
P I 712.5–756 869–944 637.5–650 394–450 300–319 206–225 P II 806–906 819–919 625–875 337.5–400 275–300 194–212.5 P III 744–825 941–1156 806–825 437.5–456 362.5–381 187.5–250 continued.
ta5 LR BV SV BR P I 125–150 0.69–0.73 2.0–2.16 2.48–2.62 3.18–6.57 P II 125–137.5 0.76–1.0 2.40–2.66 1.98–2.61 4.45–4.81 P III 125–137.5 0.81–0.88 2.17 2.0–2.16 4.80–5.22 Hypopygium (Figs 6, 7): tergite IX with [3] 2–4 central setae. Anal point covers the aedeagal complex. Sternapodeme [141] 140–146 μm long. Phallapodeme [61.5]–63 μm long. Gonocoxite [154]–180 μm long and [121.5] 118.5–144.5 μm wide. Gonostylus 157–[161.5] μm long, apex with 5 teeth and tapered megaseta. HR [0.95]–1.15. HV [2.23]–2.38. Aedeagal complex: lateral arc absent, grooved aedeagal blade [38.5]–53 μm long, base [9] (n=1) μm wide, 9/10 with [7] μm (n=1) width, dorsal lobe [11]–15 μm long, lateral and basidorsal lobes present.
Female: unknown.
Pupa (n = 3, unless otherwise stated)
Dimension: male abdomen 2.5–3.7 mm long.
Coloration: exuviae yellow; wing sheath without spots (Fig 13).
Cephalothorax (Figs 8, 9): wing sheath 0.70–1.25 mm long and veins absent. Thoracic horn 229–290 μm long and 80–95 μm wide; without membranes; reticulation of respiratory atrium with hexagonal pattern; preapical papilla and plastron plate not discernible, aeropyle tube 37.5 (n=1) μm long and with club-shaped apex; basal lobe present. Thoracic comb with 9–11 tubercles.
Abdomen (Figs 10, 11, 12): tergites II–VII with shagreen composed of small spinules or serially arranged in transverse arched rows. Tergite I with scar 72.5–132.5 μm long. Chaetotaxy on segment IV as in Figure 10. Tergite VII without taeniae. Tergite VIII with 5 taeniae, LS1 52.5–60 μm. Anal lobe 300–315 μm long and 412–430 μm wide; with 2 anal macrosetae, LS1 72.5–100 μm, LS2 200–230 μm; outer and inner margins spinulate. Genital sac 137.5 μm long. GS/AL 0.44–0.46.
4th instar larva (n = 3, unless otherwise stated)
Coloration (Figs 14, 17): head yellow, without spots; postoccipital margin brown; second antennal segment and maxillary palp pale yellow; apex of mandible brown; ligula teeth yellow; abdomen pale yellow; procercus yellow; posterior parapod with 3 brown claws.
Head (Figs 14–16, 18, 19): conic; 500–560 μm long, 325–400 μm wide; posterior region with crenulations; IC 0.58–0.78. Chaetotaxy as in Figure 15. Antenomeres1,2-5: 162.5–182.5, 37.5–44 μm long; A1 with ring organ located 63–75 μm from base; AR 3.91–4.38. Maxillary palp with 2 segments; palpomeres1–2: 7.5–12.5; 10–12.5 μm long; palpal formula 2+0; P1/P2 0.66–1.11; A1/P 1 14–23; A2/P1 2.80–4.60. Mandible 72.5–80 μm long, with 1 sensillum campaniformium 20 μm from apex; A1/MD 2.10–2.43. Dorsomental teeth not discernible. Hypopharyngeal complex: ligula 37.5–44 μm long; maximum width 25.5–25 μm, with 5 small teeth on each side and with central space; muscle attachment 12.5 μm long and 30 μm wide; bifid paraligula 14 μm long. Pecten hypopharyngis absent.
Body (Fig. 17): procercus 90–100 μm long and 22.5–37.5 μm wide, with 7 anal setae 230–300 μm long. Anal tubules not measurable. Posterior parapod apex without spinulates; with 12 simple claws with border slightly serrated, with 3 hooked claws and 2 small claws situated among the large claws.
description: Published as part of Fusari, Lívia Maria, Neubern, Caroline S., Hamada, Neusa & Roque, Fabio O., 2012, New species of Ablabesmyia Johannsen from the Neotropical region: first report of a sponge-dwelling Tanypodinae, pp. 43-50 in Zootaxa 3239 on pages 44-49, DOI: 10.5281/zenodo.280449