Djalmabatista patamona , 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: 368-370

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Djalmabatista patamona

sp. nov.

Djalmabatista patamona  sp. nov.

Type material. Holotype male with pupal exuviae, BRAZIL, Roraima State, Caroebe municipality, Vicinal 0 5 — Igarapé Jacaré , 01°03'58.2"N  ; 59°35'06.8"W, 24.iii.2012, G.P.S. Dantas (INPA).

Diagnosis. Male— combination of abdomen yellow, with distinct anterior brown pattern on tergites I –VII, tergite VIII pale, hypopygium pale with lateral brownish marks; gonocoxite robust, dorsomedian surface with a group of about 20 stout bristles, arising from protruding tubercles; gonostylus with straight outer edge, forming a right angle; apical lobe without dorsal lamella; subapical lobe lanceolate, with a bristle at the inner margin; and inner margin with the basal lobe formed by 4 prominent tubercles bearing a bristle. Pupa— combination of thoracic horn slender, plastron plate distinct, with surface facing up, respiratory atrium connected to the plastron plate by a narrow, elongated, discontinuous central duct; anal lobe rounded, with distinct terminal elongate projection, pointed at apex; genital sac wider than long.

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

Male (n= 1). Total length 2.71 mm. Wing length 1.26 mm. Total length/wing length 2.17. Wing length/length of profemur 2.38.

Coloration: Head and palps pale brown. Thorax pale, with scutum brown. All legs pale brown. Wing hyaline with brown spot over RM. Abdomen yellow with distinct anterior brownish pattern on tergites I –VII, tergite VIII pale, hypopygium pale with lateral brown marks.

Head ( Fig. 1View FIGURE 1 A): AR 1.43. Antenna with 14 flagellomeres; flagellum 898 µm long, apical flagellomere 104 µm long, 28 µm wide at base. Temporal setae 12, uniserial to irregular posteriorly. Clypeus square-shaped, 74 µm long, 86 µm wide, with 10 setae. Tentorium 127 µm long, 20 µm wide. Stipes not measurable. Lengths/widths of palpomeres 1–5 (in µm): 35/28, 51/23, 79/27, 93/20, 138/16. Eyes separated by 126 µm, dorsomedial extension 93 µm long, 31 µm wide.

Thorax ( Fig. 1View FIGURE 1 B): Antepronotum with 3 lateral setae, tubercle present. Acrostichals 19, biserial; dorsocentrals 7, uniserial; prealars 3; supraalar 1. Scutellum damaged. Anepisternals, preepisternals and postnotals absent. Scutal tubercle absent; medial scar present.

Wing ( Fig. 1View FIGURE 1 C): 460 µm wide. VR 1.05; WW 0.36. Costa produced, reaching apex of wing, 1.35 mm long, costal extension 170 µm long. R2, R3 and R3+2 present; R2 reaching R3+2; R3 reaching C. MCu slightly anterior to RM. Cu with petiole, 230 µm long. Brachiolum with 1 seta, R with 13 setae, R1 with 10, R4+5 with 18, M1+2 with 11, M3+4 with 8. Cell r 4+5 with 26 setae, m1+2 with 15 setae. Squama with 10 setae. Anal lobe well-developed.

Legs. Fore leg: tibia bearing one elongated apical spur, 35 µm long, with an elongated apical tooth, curved at apex and 3 smaller inner teeth; tibia 40 µm wide at apex. Mid leg: tibia bearing two apical spurs, smaller spur 23 µm long, with an apical tooth and 3 inner teeth, larger spur 36 µm long, with an elongated apical tooth, curved at apex and 5 smaller inner teeth; tibia 40 µm wide at apex. Hind leg: tibia bearing two apical spurs, smaller spur 26 µm long, with an apical tooth and 3 inner teeth, larger spur 47 µm long, with an elongated apical tooth, curved at apex and 4 smaller inner teeth; tibia 40 µm wide at apex; tibial comb well defined, with 9 bristles. All legs with pseudospurs in ta1, ta2 and ta3; with slender claws, slightly curved at apex. Lengths and proportions of legs in Table 2.

Hypopygium ( Figs. 1View FIGURE 1 D –E, 2A –C): Tergite IX with 10 scattered setae; lateroposterior margin lobular, rounded. Anal point broad and bilobed apically. Phallapodeme 60 µm long. Sternapodeme markedly arched and slender anteriorly. Superior volsella asymmetrically arched, 56 µm long. Gonocoxite robust, subcylindrical, 110 µm long, 77 µm wide; with a group of about 20 short robust bristles on the dorsomedian surface, mostly arising from raised tubercles; inner margin with a deep basal concavity, covered by bristles. Gonostylus as in Figures 1View FIGURE 1 E and 2C, 70 µm long, 35µm maximum width (at the base); outer edge straight, forming a right angle to the base; apical lobe elongated and curved, 35 µm long, with a single setae rising from a distinct basal tubercle on external margin, megaseta lanceolate, 11 µm long, without dorsal lamella; subapical inner lobe 16 µm long, 5 µm wide at base, distally pointed, with a single seta ventrally; basal inner lobe 10 µm long, with 4 bristles arising from prominent tubercles. HR1.83. HV4.52.

Pupa (n=1). Total length 3.10 mm. Coloration: cephalothorax and abdomen brown.

Cephalothorax ( Figs 3View FIGURE 3 A –B, 4A –B). Frontal apotome triangular. Wing sheath smooth, 773 µm long and 310 µm wide ( Fig 3View FIGURE 3 B). Thoracic horn, subcylindrical, tapering basally, 238 µm long, maximum width 58 µm; external membrane hyaline, with scattered blunt spines; respiratory atrium thin-walled, almost filling entire thoracic horn volume and connected to the plastron plate by a narrow, elongated, discontinuous central duct; plastron plate small, hyaline, somewhat oval-shaped, with surface facing up, 17 µm long, 32 µm wide ( Figs 3View FIGURE 3 A, 4A). Basal lobe absent; thoracic comb very weak, with 4 low rounded tubercles. Thoracic membrane rugose, with a dense covering of blunt, rounded tubercle; with a well-developed triangular-shaped prealar tubercle.

Abdomen. Scar on TI absent. T I –VIII with large field of shagreen; anal lobe with shagreen on basal half. Segment II with 5 LS setae, LS1–3 arising from the segment base ( Fig 4View FIGURE 4 B); S III with 3 LS setae in the basal 1/3 and a group of about 7 fine filaments on the posterolateral corner ( Fig 4View FIGURE 4 C); S IV –VII with a lateral fringe of fine setae and a further group of multiserial setae on the posterolateral corner, VIII with 5 LS setae. Anal lobe rounded, 421 µm long, 640 µm wide at base, with distinct apical projection, pointed at apex, 95 µm long; outer border of anal lobe convex, with some scattered short spinules distal from the anal macrosetae, inner border straight ( Fig 4View FIGURE 4 D). Male genital sac 302 µm long, 434 µm wide at base, wedge-shaped, apically truncate, almost reaching the base of apical projection.

Female and larva. Unknown.

Taxonomic remarks. In general, Djalmabatista patamona  sp. nov. resembles D. antonii  both in the adult and pupal stages. However, D. patamona  sp. nov. can be distinguished by having a group of about 20 stout bristles arising from protruding tubercles on dorsomedian surface of gonocoxite and by the absence of dorsal lamella in the apical lobe of the gonostylus, contrasting with D. antonii  which has a group of about 10–12 setae on dorsomedian surface of the gonocoxite and apical lobe of gonostylus with a distinct dorsal lamella. In addition, the pupa of the new species can easily be distinguished by having a well-developed plastron plate, which is absent in D. antonii  .

Distribution and biology. The new species is known only from the type locality in the far north of Brazil. The species was collected in a stream about 10 m wide, with black water and sandy bottom, surrounded by dense forest.

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