Zygothrica grajau, Mendes & Blauth & Gottschalk, 2021

Mendes, Mayara F., Blauth, Monica L. & Gottschalk, Marco S., 2021, Three new species of Zygothrica (Diptera: Drosophilidae) from the Neotropical region, Brazil, Revista Brasileira de Entomologia (e 20210059) 65 (3), pp. 1-10 : 5-8

Zygothrica grajau sp. nov.

( urn:lsid:zoobank.org:act:348F7C30-2441-4CC0-A74A-0E05D8F2E690 )

( Figures 7-9; 10C)

Type. Holotype ♂ labeled with the information “ Zygothrica grajau sp. nov. Mendes et al. HOLOTYPE ♂ ”, “Brasil, [Rio de Janeiro], Rio de Janeiro, Grajau; 21.II.1965; Col: H.S. Lopes ”. Abdominal sclerites and the terminalia were stored in a microvial with glycerine, the wing was removed and prepared on a permanent slide with Canada balsam. The material was attached to the specimen.

Type locality. Grajaú , Rio de Janeiro, Rio de Janeiro, Brazil .

Diagnosis. Body color predominantly yellow. Thorax yellow, with three pairs of dark brown longitudinal stripes in the scut, a pair of stripes between dorsocentral bristles, a pair along the dorsocentral and a pair laterally to the dorsocentral, interrupted in the transverse suture; scutellum almost entirely dark brown with three yellow bands, one median and two laterally; convergent basal scutellar bristles; pleura yellow. Abdomen yellow; tergites I yellow, II and III with dark brown bands extending laterally without reaching the margin, tergites IV to VI with brown rounded spots in the median region; aristae with 5 dorsal, 2 ventral and 3-4 short inner branches, plus terminal fork; flagellomere yellow; prominent facial carina, slightly whitish-yellow; legs yellow. Wings hyaline; lappet and bM-Cu absent; brown spot on the apical portion of the wing and extending from the final portion of C to just before M. R 4+5 slightly curved. Halters yellow.

Description. ♂

Head. Yellow. Width = 0.68 mm. Eyes dark red, with interfacetal setulae.Escape yellow, pedicel brown and flagellomere yellow, slightly whitish; length of the flagellomere approximately 2x the length of the pedicel. Aristae with 5 dorsal, 2 ventral and 3-4 short inner branches, plus terminal fork. Orbital plates yellow. Orbital bristles dark brown. Distance between or1 and or2 = 0.06mm, between or1 and or3 = 0.13mm and between or2 and or3 = 0.07mm. Frons with dark brown frontal vittae, and orbital plates yellow.Ocellar triangle yellow, corresponding to more than 2/3 of the length of the forehead; region between ocelli dark brown; convergent postocellar bristles; anterior width of the frons equivalent to the length, posterior width slightly smaller than the anterior. Facial carina large, yellow. Gena yellow, slightly whitish. Proboscis, palpus, and labellum yellow.

Thorax. Yellow, with three pairs of dark brown dorsal longitudinal bands; a pair between dorsocentral bristles, a pair along the dorsocentral bristle lines and a pair laterally of the dorsocentral bristle lines and interrupted in the transverse suture; scutellum dark brown with three yellow longitudinal stripes, one median and two lateral; basal scutellar bristles convergent; pleura yellow, 2 katerpisternal bristles, of which the second is 1,5x longer than the first. Length = 0.88mm, width = 0.70mm. Legs yellow.

Wings. Hyalines; lappet and bM-Cu absent; brown apical spot extending in third and fourth sections of C. Vein R 4+5 slightly curved posteriorly. Halters yellow. Indices: C = 3.04; ac = 3.30; hb = 0.55; 4c = 0.74; 4v = 1.65; 5x = 1.35; M = 0.32; prox. x = 0.37. Length = 1.98mm.

Abdomen. Yellow, tergite I yellow, tergite II yellow with a black band in posterior region not extending laterally, tergite III with black band reaching tergite II and extending laterally, tergite IV with medium black band touching the previous tergite, tergite V-VI with black rounded median spot not touching the previous tergite.

Terminalia. Epandrium rounded and ventral lobes small. Cerci free, elongated posteriorly; with long setae at the apex and microtricose at lateral margin and base. Hipoproctal plate present, with two medial ventral elongated processes. Surstylus S-shaped, with 6-8 prensisetae arranged in a half-moon. Postgonites (gonopods sensu Grimaldi, 1987) attached to the hypandrium and with two small setae on the inner margin. Small pregonites (paraphysis sensu Grimaldi, 1987) fused to gonopods. V-shaped hypandrium, shorter than the epandrium.Phallus (aedeagus sensu Grimaldi, 1987), broad in the apical region and with evident setulae in the ventral portion. Phallapodeme (aedeagal apodeme sensu Grimaldi, 1987) long and laterally broad.

♀ Unknown.

Geographic distribution: Known only from type locality.

Etymology: The species name refers to the type locality, Grajau, city of Rio de Janeiro, Rio de Janeiro, Brazil.