Pseudogaurax longitriangularis, Marques & Riccardi & Ale-Rocha, 2022

Marques, Carla De Oliveira, Riccardi, Paula Raile & Ale-Rocha, Rosaly, 2022, New records and species of Pseudogaurax Malloch, 1915 (Diptera: Chloropidae) from the Amazon basin, Zootaxa 5200 (6), pp. 501-524 : 511-512

P. longitriangularis sp. nov.

( Figs. 37–43 )

Type specimens examined: Holotype ♀ ( INPA; not dissected): BRAZIL, [Amazonas] Novo Aripuanã Reserva Soka / 05°15′53″S 60°07′08″W / 14–23.iv.2000 / Malaise, J. Vidal col. Paratypes 10 ♀: same data es holotype except, 28.iv–05.v.1999 (1 ♀, MZUSP; 1 ♀, INPA) ; Manaus , Amazonas, Reserva PDBFF Km41 , trilha EE B–SB , 22.xii–07.i.05, Ranyse Querino Col. (1 ♀, INPA) ; idem, 07–08.vii.2014 (1 ♀, MZUSP) ; Barcelos, Rio Padauari , Com. Ararinha 00°30′18″N; 64°03′30″W (1 ♀, INPA) ; Acre, Bujari, FES Antimary 9°20′01″S – 68°19′17″W, 18–31.i.2017, Malaise grande, E.F. Morato, J.A. Rafael Cols. —Rede BIA (1 ♀, MZUSP) ; idem, 3.viii–08.ix.2016, Malaise pequena (1 ♀, MZUSP; 1 ♀, INPA) ; Rondônia, Nova Mamoré, Parque Estadual de Guajará-Mirim, Rio Formoso 10º19′26″S 64º33′88″W, 27.x.1995, armadilha Malaise, J. Vidal, L.S. Aquino cols. (1 ♀, MZUSP) ; Palmas, Tocantins, Igarapé da Onça , 30.i.2018 (1 ♀, INPA) .

Other specimens examined: BRAZIL, Roraima, Ilha de Maracá, Estação Ecológica de Maracá , 3°22.229′N, 61°26.335′W, 11–26.vii. 2015, 119 m, Malaise trap, ponto 7 trilha principal [main trail] , Biffi, Falaschi, Mandulão, Marinho, Pinheiro & Riccardi leg. (2 ♀, MZUSP) ; Maranhão, Mirador, Parque Est. Mirador , Base da Geraldina , 419 m, 06°37′25″S, 45°52′08″W, varredura, 2–12.viii.2013, F. Limeira-de-Oliveira, L.L. Santos & L.S. Santos cols. (1 ♂, MZUSP) .

Diagnosis. Scutum with one pair of dark acrostichal stripes, dark dorsocentral stripes divided by the transverse suture, dark postalar stripe absent; scutellum slightly longer than wide, triangular dark brown stripe reaching the apex; ocellar triangle dark mesally; anepisternum and katepisternum with a dark mark; tibiae and fore tarsus brown.

Description. Body length 3.8 mm; wing length 3.4 mm; dark brown to yellow body pilosity. Head ( Fig. 38 ). Yellow; ocellar triangle yellow, with the mesal part dark brown, reaching to about ¾ of apex of frons; occiput entirely yellow; ocellar setae reclinate and convergent; postocellar as long as the outer vertical setae, cruciate; interfrontal setulae indistinct; vibrissa slightly distinct, yellow, as long as the genal pilosity; antenna dark yellow; postpedicel rounded; 1 st aristomere yellow, remaining arista dark, with short and sparse pilosity; palpus yellow; proboscis dark yellow. Thorax ( Figs. 37; 39 ). Scutum yellow with black longitudinal stripes, acrostichal (mesal) stripe complete and bifid, dorsocentral stripe (inner) divided by the transverse suture, intra-alar (outer) stripe absent; postpronotum completely yellow; scutellum yellow, 1.5 times longer than wide dorsally, with a triangular dark brown stripe almost reaching the apex of the scutellum; subscutellum brown; pleuron yellow, anepisternum with a large black mark; 1 + 2 notopleural setae; legs yellow, tibiae and fore tarsus dark brown; tibia yellow, organ reaching less than half of hind tibia length. Wing. Hyaline; tegula with dark brown setulae; costal sectors 1–4: 4, 4, 3.5, 1.5; halter yellow.

Abdomen. Syntergite 1+2 yellow, remaining tergites dark brown dorsally; sternites yellow. Female terminalia ( Figs. 42–43 ). Segments 6–8 narrow; epiproct bare, with a pair of setae; hypoproct pilose; cerci brown, long and narrow. Male terminalia. Unknown.

Etymology. The specific epithet ‘ longitriangularis ’ is derived from Latin, meaning long triangle. It refers to a long triangular mark on scutellum.

Distribution. Brazil (Amazonas, Maranhão, Rondônia, Roraima, Tocantins).

Comments. Some paratypes have a brown mark on anepisternum and katepisternum.

Figures

FIGURES 37–41. Female holotype of Pseudogaurax longitriangularis sp. nov., external morphology. 37, habitus, lateral; 38, head, front view. 39, thorax, dorsal view; 40, sub-scutellum, posterior view; 41, hind tibia, posterior view (pale yellow oval area indicating location of tibial organ). Scale bars: Fig. 37 = 1.0 mm; Figs 38–41 = 0.3 mm.

FIGURES 42–43. Terminalia of Pseudogaurax longitriangularis sp. nov. (Holotype female). 42, female abdominal tergite 8 and cercus, dorsal view; 43, female abdominal sternite 8 and cercus, ventral view. Scale bars: Figs 42–43 = 0.2 mm.