Neopachycerina nigra Silva & Frare, 2018

Silva, Vera Cristina & Frare, Livia Maria, 2018, Taxonomic revision of the Neotropical Lauxaniidae genus Neopachycerina Malloch, 1933 (Diptera: Schizophora), with description of a new species, Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 58, pp. 1-8 : 3-7

Neopachycerina nigra Silva & Frare , sp. nov. ( Figs. 2 , 3 A-D)

Diagnosis: Brownish black body, with anterior margin of frons and face yellow; arista black, thickened by dense black short setulae both above and below, with some slightly longer, outstanding hairs on upper side basally; wing membrane yellowish hyaline, with blackish base.

Description: Male and female. Body length, 2.5 mm; wing length, 2.8 mm.

Head ( Figs. 2A, B, C ): Vertex rounded; ocellar triangle close to vertex, ocellar tubercle well developed, ocelli whitish yellow. Frons rectangular, wider than long; in profile, almost flat; anterior part concave in dorsal view; brownish black, anterior margin shining yellow, fronto-orbital plate shining, other parts dull. Fronto-facial angle slightly less than 90°. Face concave in profile, with a deep median transversal groove; shining brownish yellow; lunule exposed. Eye small, oval, posteroventral outline rounded, lower half narrowed. Parafacial and gena wide, brownish yellow, with whitish pruinosity; postgena yellow. Mouthparts brownish yellow; clypeus slen- der, brownish; palpus slender, brown with paler base. Antenna: yellow; scape shorter than pedicel; pedicel with 1 dorsal and 2 ventral apical setae; first flagellomere long, oval, tapering toward apex; arista black, thickened by dense black short setulae both above and below, with some slightly longer outstanding hairs on upper side basally. Chaetotaxy: outer vertical seta half the length of the inner vertical seta, short; ocellar setae longer, at least at the same level of anterior margin of the frons, in dorsal view, diverging; postocellar setae short, cruciate (partially broken in the holotype); anterior orbital seta minute; posterior orbital seta long,reclinate;2 genal setae; supravibrissal setae few and sparse, quite long.

Thorax ( Fig. 2A ): Brown, with yellow pruinosity; scutum arched; scutellum triangular, short, convex. Chaetotaxy: 0+3 dorsocentral setae, anterior seta very small and close to suture; 1 postpronotal seta; 2 notopleural setae; prescutellar acrostichal seta absent; 4 rows of acrostichal setulae; intra-alar seta absent; 1 presutural and 1 postsutural supra-alar setae; 2 postalar setae; 1 short proepisternal seta; 1 katepisternal seta; anepisternal seta absent; anepimeron bare; 2 long scutellar setae, apical pair parallel. Legs: Mostly brown, fore legs brownish yellow, fore coxa darker at base, mid and hind tibiae brown with yellowish apical third. Fore coxa with 1 preapical dorsal seta, 1 subbasal dorsal seta; fore femur with 1 subbasal posteroventral seta and posterior and posteroventral rows of setae; fore tibia with 1 preapical dorsal seta, 1 short apical ventral seta; mid coxa with apical row of setae; mid femur with anterodorsal row of setae and 1 short apical posteroventral seta; mid tibia with 1 strong apical ventral seta; hind coxa with 1 apical dorsal seta; hind femur with 1 preapical anterodorsal seta; hind tibia with 1 short preapical seta. Wing ( Figs. 2A, D ): yellowish hyaline, with blackish base, veins yellow; costa sapromyziform (costal spinules not reaching apex of vein R₄ ₊ ₅); Radial veins bare; crossvein r-m before middle of discal cell; crossvein dm-m before middle of r₄ ₊ ₅; longitudinal veins almost parallel; anal vein shorter than length cell cua. Halter blackish brown.

Figures

Figure 2. Neopachycerina nigra Silva & Frare,sp.nov.(A) Habitus,lateral view; (B) Head,dorsal view;(C) Head,lateral view;(D)Wing.Scales 0.5mm.

Figure 3. Neopachycerina nigra Silva & Frare,sp. nov.,figs.A-D: (A) Male terminalia, ventral view;(B) Male terminalia,lateral view;(C) Female terminalia,ventral view;(D) Spermathecae.Neopachycerina aristata Malloch,figs.E-F:(E) End of female abdomen,ventral view;(F) Spermathecae.Scales 0.1 mm.