Djalmabatista wapixana, Dantas, Galileu P. S. & Hamada, Neusa, 2017

Dantas, Galileu P. S. & Hamada, Neusa, 2017, Two new Neotropical species of Djalmabatista Fittkau (Diptera: Chironomidae), Zootaxa 4250 (4), pp. 367-377: 374-376

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Djalmabatista wapixana

sp. nov.

Djalmabatista wapixana   sp. nov.

Type material. Holotype male, BRAZIL, Roraima State, Boa Vista municipality, Igarapé Água Boa , 02°43'32,6"S   ; 60°48'39,8"W, 17/iii/2014, in light trap, G.P.S. Dantas (INPA). Paratype: 1 male, as holotype.

Diagnosis. Male: combination of color pattern of abdomen; two supraalar setae; T IX with 16 dorsal setae; gonocoxite with a cluster of 12–13 short robust setae on dorsomedian surface, arising from a prominent area; and gonostylus bifurcated, with subapical inner lobe larger than apical lobe, a external small spur near the base of the apical lobe, inner margin with a small projection between the apical and subapical lobes.

Etymology. In reference to the Wapixana   indigenous ethnic group, which lives in Roraima, the northernmost State of Brazil, where the types were collected. The specific epithet is treated as a noun in apposition.

Male (n= 1–2). Total length 2.80–3.20 mm. Wing length 1.24–1.38 mm. Total length/wing length 2.26–2.32. Wing length/length of profemur 2.18–2.20.

Coloration: Head light brown, eyes slightly iridescent, pedicel dark brown, flagellum brown, palps light brown. Thorax: Antepronotum light-brown, pale at superior region; scutum yellow, with pale area anterior to parapsidal suture; scutellum pale, with lateral brown spots; postnotum light-brown; anterior anapisternum II pale with a darker basal band; median anapisternum brown;superior half of preepisternum pale, with a medial cross brown band, inferior half yellow; wing membrane transparent, without macrotrichia, veins yellow, RM with a darkbrown spot; legs light brown, tarsomeres 4–5 slightly darker. Abdomen ( Fig 5 View FIGURE 5 F). TI–VII yellow, with brown spots on anterolateral margins; TIII – TVII with dark brown pattern; TVIII yellow. Hypopygium dark brown, gonostylus dark brown apically.

Head ( Fig 5 View FIGURE 5 A): AR 1.51–1.55. Antenna with 14 flagellomeres; flagellum 875–900 µm long, apical flagellomere 112–120 µm long, 27–30 µm wide at base, apical setae 19–22 µm long. Temporal setae 16, uniserial anteriorly, biserial posteriorly. Clypeus square-shaped, 77–86 µm long, 88–92 µm wide, with 11–15 setae. Tentorium158–164 µm long, 26–31 µm maximum width. Stipes not measurable. Lengths/widths of palpomeres 1– 4 (in µm): 38–45/29–32, 51–58/27–32, 78/29, 125/26; the fifth palpomere is damaged. Eyes bare, separated by 145–150 µm, dorsomedial extension 102–104 µm long, 34–40 µm wide.

Thorax ( Fig 5 View FIGURE 5 B): Antepronotum with1–2 lateral setae and 2 superior setae, tubercle present. Acrostichals 38, biserial, diverging posteriorly; dorsocentrals 9–11, uniserial; prealars4–7, uniserial; supraalar 2. Scutellum with 9– 11 setae, biserial. Anepisternals, preepisternals and postnotals absent. Scutal tubercle absent; medial scar present.

Wing ( Fig 5 View FIGURE 5 C): 440–456 µm wide. VR 1.46; WW 0.33–0.36. Costa produced, reaching apex of wing, 1.27– 1.38 mm long, costal extension 1.25–132 µm long. R2, R3 and R3+2 present; R2 weak, R3 reaching C. MCu slightly anterior to RM. Cu with petiole. Brachiolum with 2 setae, R with 16–18 setae, R1 with 10–15, R4+5 with 18–20, M1+2 with 12–13, M3+4 with 10–12. Cell r4+5 with about 30 setae, restricted to apical area; m1+2 with about 15 setae, restricted to apical area. Squama with 12–16 setae. Anal lobe well-developed.

Legs. Fore leg: tibia bearing one elongated apical spur, 40–43 µm long, with an elongated apical tooth, curved at apex and 5 smaller inner teeth; tibia 37–44 µm wide at apex. Mid leg: tibia bearing two apical spurs, smaller spur 24–29 µm long, with an apical tooth and 3–4 inner teeth, larger spur 38–45 µm long, with an elongated apical tooth, curved at apex and 4–5 smaller inner teeth; tibia 42–46 µm wide at apex. Hind leg: tibia bearing two apical spurs, smaller spur 25–32 µm long, with an apical tooth and 4 inner teeth, larger spur 48–52 µm long, with an elongated apical tooth, curved at apex, inner teeth not observed; tibia 45–48 µm wide at apex; tibial comb well-defined, with 9–11 bristles. All legs with pseudospurs in ta1, ta2 and ta3; with slender claws, slightly curved at apex. Lengths and proportions of legs in Table 3 View TABLE 3 .

Hypopygium ( Figs 5 View FIGURE 5 D–F, 6A–B): Tergite IX with 14–16 scattered setae; lateroposterior margin lobular, rounded shaped. Anal point broad and bilobed apically. Phallapodeme 88–95 µm long. Sternapodeme markedly arched and slender anteriorly. Superior volsella asymmetrically arched, 80–87 µm long. Gonocoxite robust, subcylindrical, 118–135 µm long, 84–91 µm wide, with a cluster of 12–13 short, robust bristles on the dorsomedian surface, arising from a prominent area. Gonostylus as in Figures 5 View FIGURE 5 F and 6B, bifurcated at apex, 72–88 µm long, 35–36 µm maximum width; external margin rounded, without knee; apical lobe slender, 33–34 µm long, with a small basal outer spur, megaseta rounded at apex, 14 µm long, without dorsal lamella; subapical inner lobe elongated and robust, 39–41 µm long, 16–17 µm wide at base, wider at the base and tapering gradually to the apex, which is conical; inner margin with a small projection situated between the two apical lobes, 7–8 µm long, with an apical bristle; basal inner lobe15–18 µm long, with 4 apical bristles. HR 1.53–1.64. HV 3.64–3.89.

Female, pupa and larva. Unknown.

Distribution and biology. The new species is known only from the type locality in the far north of Brazil. The specimens were collected with light trap in a stream about 15 m wide, sand bottom, with water temperature approximately 30°C, low electrical conductivity (4.23µS/cm) and neutral pH (6.9) in the lavrado (Roraima savanna) vegetation type.

Taxonomic remarks. Djalmabatista wapixana   sp. nov. is similar to D. director   by having similar abdominal color pattern of abdomen and strongly bifurcated gonostylus. However, the two species have significant differences in the hypopygium morphology: D. wapixana   sp. nov. has a group of 12–13 bristles on the dorsal surface of gonocoxite arising from a prominent area, sternapodeme markedly arched anteriorly, gonostylus with subapical lobe larger than apical lobe and a small spur in the external margin, near the base of the apical lobe, while D. director   has a group of 20–30 bristles on the dorsal surface of gonocoxite, sternapodeme slightly arched anteriorly, gonostylus with subapical lobe smaller than apical lobe and the spur in the external margin is absent.

TABLE 3. Lengths (in µm) and proportions of leg segments of Djalmabatista wapixana sp. nov., male (n = 1 – 2).

  Fe Ti ta1 ta2 ta3 ta4 ta5 LR BV SV
P1 555–645 736–823 520–608 240–286 167–186 111–128 97–102 0.71–0.74 2.94–2.96 2.42–2.48
P2 606–690 651–751 450–528 204–246 138–160 96–108 85–93 0.69–0.70 3.24–3.26 2.73–2.79
P3 530–600 758–898 630 325 215 135 105 0.70 2.73 2.38