Neurigona tingua, Silva & Capellari & Oliveira, 2022

Silva, Paulo Cesar Da, Capellari, Renato S. & Oliveira, Sarah S., 2022, Three new species of the Neurigona orbicularis species group from Brazil (Diptera: Dolichopodidae), Zootaxa 5093 (5), pp. 547-558 : 555

Neurigona tingua sp. nov.

( Figs 5 , 26–32 )

Description. Male. Body length: 3.3–3.6 mm. Wing length: 3.6 mm. Very similar to N. lopesi sp. nov. in both general habitus and chaetotaxy, except as noted below.

Head. Frons around one-third of head width; eyes almost touching at the middle of face (the widest point narrower than ocellus width); face yellow, with weak silver pruinosity only on basal quarter; postpedicel length 0.19 mm; stylus length 0.75 mm; otherwise as in N. lopesi .

Thorax. Mesonotal depression dark brown with bluish and purple reflections, with median, brownish stripe as broader as the area between acrostichal rows; mesopleuron, just above coxa II, with brownish area posteriad; remaining of thorax and wing as in N. lopesi . Legs. Leg I. Podomere ratios: 9.3, 8.7, 6.7, 4.3, 2, 1.3, 1. Anterior surface of coxa I covered by short setae, with row of 5 strong apical black setae on apical edge. Tibia I without conspicuously longer setae. Leg II. Podomere ratios: 10.7, 12.3, 9, 4, 2.3, 1.3, 1. Anterior surface of coxa II covered only by black setae. Tibia II with 1 small dorsal seta at basal 1/10, 1 anterodorsal seta at basal 1/5, anterodorsalposterodorsal setal pair at basal 3/5 and 2 apical setae. Leg III. Podomere ratios: 11, 16.7, 4.7, 5.3, 3, 2, 1. Coxa III with strong, black lateral seta in basal half, with 3–5 tiny hairs above. Tibia III with 2 anterodorsal setae at basal 1/5 and 3/5, 4 more conspicuous dorsal setae at basal 1/10, 3/10, 4/10 and 7/10, and 3 large apical setae. Wing. RMx ratio = 0.78, CuAx ratio = 0.45.

Abdomen. Tergite 1 entirely yellow; tergites 2–5 mostly brown, but with yellow hind margin, broader in tergites 2 and 3, followed by anterior medial yellow stripe. Sternites 1 and 2 yellow, 3 brownish, 4 hidden, 5 brown, forming triangular ventral projection. Tergite 6 brown, bare. Tergite and sternite 7 reduced, brown. Tergite covering black mostly, those of hind margin of segments 1–5 longer; setae on ventral margin of tergite 4 and entire tergite 5 whitish. Sternite 8 dark brown. Hypopygium ( Figs 5 , 26–32 ). Genital capsule brown, surstyli dark brown, with apices paler ( Figs 5 , 26 ). Ventral lobe of surstylus ( Fig. 27 ) rounded, without elongated projection, with two apical setae, dorsal one slightly flattened. Dorsal lobe of surstylus ( Fig. 28 ) with small cup-like projection curved inwards, with ventral projection with microtrichia at apex. Apicoventral epandrial lobe ( Fig. 29 ) four-branched: one branch bearing two simple setae, one branch with modified, branched seta and one inner, delicate branch with several hairs. Basolateral epandrial lobe ( Fig. 30 ) bifurcated, dorsal branch thinner.Apex of hypandrium ( Fig. 31 ) with two lateral projections and one anterodorsal projection. Postgonite ( Fig. 31 ) slightly enlarged, with hairs at apex. Cercus ( Fig. 32 ): lateral part dark and sclerotized with two setae; medial part delicate, with digitiform apical projection, trifurcate at apex, bearing 3 simple setae.

Female. Body length: 3.6 mm. Wing length: 3.4 mm. Very similar to male, except as noted. Eyes distinctly separated on face, narrowest distance on face wider than distance between ocellar setae. Thoracic pleura yellow, without brownish area above coxa II. Abdominal segment 5 without ventral projection. Abdomen. Tergite 1 yellow, tergites 2–5 mostly brown, with narrow yellow stripe dorsally and yellow hind margins on tergites 2 and 3. Ovipositor as in N. lopesi sp. nov.

Type material. HOLOTYPE ♂: “ BRASIL: RJ [Rio de Janeiro State]: Nova Iguaçu | Reserva Biológica [ Biological Reserve ] do Tinguá | 22°34′28 ′′S 43°26′10.7′′W. Malaise | Bosque [woodland] Ponto [point] 5, 5- 11.III.2002, | S. T. P. Amarante & eq.col.”, “ HOLOTYPE | Neurigona tingua | Silva, Capellari & Oliveira [red label]” ( MZSP) . Holotype in good condition, genitalia not dissected. PARATYPES: BRAZIL. 4♂, 2♀, same data as holotype ; 2♂, 1♀, same data except, 22°34′32′′S 43°26′6.6′′W, track 3, 5–8.iii.2002 . 1♀, same data except, 22°34′37″S 43°26′5″W, track 1 ( MZSP) ; 2♂, same data except, ponto [point] 1, 22°34′37′′S 43°26′5′′W ; 1♀, same data except, ponto [point] 4, 22°34′30′′S 43°26′8.4′′W, 8–11.iii.2002 ( UFG) .

Etymology. Toponymic, referring to the type-locality and treated as a noun in apposition.

Remarks. Neurigona tingua sp. nov. belongs to the group of species with closely approximated eyes on the middle of the face (see Remarks under N. papaveroi above), and can be differentiated by the relatively compact genital capsule and short surstyli ( Figs 26–28 ), as well as the bifurcate basolateral epandrial lobe ( Fig. 29 ) (single lobe in other species) and by the apex of hypandrium ( Fig. 31 ) with two lateral and one dorsal projections (hypandrium without projections in other species).

Distribution. Brazil (State of Rio de Janeiro, Atlantic Forest biome).

Figures

FIGURES 1–5. General habitus and male and female genitalia. 1–3. Neurigona lopesi sp. nov. 1. Habitus. 2. Male genital capsule. 3. Female ovipositor. 4. Neurigona orbicularis, genital capsule. 5. Neurigona tingua sp. nov., genital capsule. Scale bars = 1 mm (1) and 0.1 mm (2–5).

FIGURES 26–32.Hypopygium of Neurigona tingua sp. nov. and its componentappendages in left lateral view.26.Hypopygium. 27. Ventral lobe of surstylus. 28. Dorsal lobe of surstylus. 29. Apicolateral epandrial lobe. 30. Basolateral epandrial lobe. 31. Hypandrium (hyp) and postgonite (pgn). 32. Cercus. Scale bar = 0.1 mm.