Neotraginops fachini, Flores & Pirani & Gaimari & Amorim, 2021

Flores, Heloísa Fernandes, Pirani, Gabriela, Gaimari, Stephen D. & Amorim, Dalton De Souza, 2021, Two new species of Neotraginops Prado from Costa Rica and Brazil (Diptera: Odiniidae: Traginopinae), Zootaxa 5048 (2), pp. 176-190 : 179-180

Neotraginops fachini sp. nov.

( Figs 2–4 )

Diagnosis. Ocellar tubercle well developed, occupying entire vertex, covered by scattered rows of setulae. Two longitudinal dark brown stripes with greyish pollinosity on the face. Vibrissal angle enlarged. Genal groove deep, yellow, with one brown spot below margin of eye. Wing with marks along cells r 1 and r 2+3 more or less rectangular. Pregonite pilose, except for the margin articulated with hypandrium.

Material examined. Holotype (left wing slide-mounted, terminalia in vial), ♂ ( LACM): COSTA RICA, Alajuela Province, 20 km S Upala , F. D. Parker, 29.i.1991.

Paratypes: COSTA RICA, Alajuela Province, 20 km S Upala , F.D. Parker, 28.ii.1991 (1♀, LACM) , 1– 10.iv.1991 (1♀, LACM) , 6.vi.1990 (1♀, LACM) , 23.x.1990 (1♀, USNM) , 28.x.1990 (1♀, LACM) , 30.x.1990 (1♂, CSCA; 1♂, USNM), 6.xi.1990 (1♂, CSCA; 1♂, LACM), 13.xi.1990 (1♀, LACM) , 27.xi.1990 (1♀, CSCA) , 6.xii.1990 (1♀, CSCA; 1♀, USNM), 11.xii.1990 (2♀, LACM) , 25.xii.1990 (2♀ (1 with terminalia in vial), LACM; 1♀, CSCA) .

Description. Adults ♂, ♀. Body length, 4.1–4.4 mm. Head ( Figs 2A–C , 3A ). Higher than long in lateral view, wider than high in anterior view. Height 1.96–1.98X length; height 1.06–1.08X width. Eye slightly higher than long in lateral view. Broad, dark brown ocellar tubercle, covered by scattered rows of setulae. Frons 4.16X wider than long. Frons anteriorly orange, brownish on lateral margins of ocellar tubercle. Posterior margin of eye orange, extending to postcranium, and narrowing in postocellar region. Fronto-orbital plate with golden pollinosity, dark brown around insertion of fronto-orbital setae, scattered setulae present. Posteriormost fronto-orbital seta at level of posterior ocelli. Lunule strongly arched, approximately one-third of length of frons, lateroventrally bordered by golden-yellow pollinosity. Face with greyish pollinosity, two longitudinal dark brown stripes. Oral vibrissa well developed, plus 1–2 subvibrissal seta, surrounded by subvibrissal setulae. Parafacial greyish with a median dark brown spot ventrally extending to genal groove area below eye. Streak of bare yellow extending from the brown spot along the lower posterior margin of the eye. Gena broad, brown in the anterior part, with greyish pollinosity, plus densely scattered setulae. Genal groove area yellow. Antennal scape and pedicel light brown; first flagellomere orange, rounded, slightly longer than high, with scattered hairs; arista pubescent, mostly dark brown, basal end orange. Clypeus light brown, with golden yellow pollinosity. Palpus spatulate, orange, with scattered setulae. Proboscis brown with dark yellow setulae. Thorax ( Figs 2A , 3B ). Mesonotum length, 1.76–1.78 mm, width, 1.23–1.26 mm. Chaetotaxy: 3 postpronotals (middle one 1.5X longer than others), anepisternum and anepimeron bare, 2 propleurals (anterior longer than posterior), 2 notopleurals, 3 katepisternals (anterior one longer, median and posterior of same length), 1 presutural supra-alar, 2 postsutural supra-alars, 1 postalar, 2 intra-alars, 4 dorsocentrals (similar length, 1 presutural), 1 prescutellar acrostichal seta, and 2 scutellars. Scutum brown, covered by whitish pollinosity; arrow-shaped brown vitta, all dorsocentrals with a brown spot surrounding base, second and third ones connected to median band, first one weakly connected; 12 rows of acrostichals present. Pleuron covered by greyish pollinosity, with complex pattern of brown pollinosity. Postpronotal lobe with anteroventral margin dark brown. Anepisternum mostly dark brown, with three greyish pollinosity halos. Katepisternum with two dark brown spots, setulose. Scutellum brown in distal 2/3 with a central triangular yellow spot, silvery-grey basally, disc densely setulose. Legs ( Fig. 2A ). Mostly brown, with yellow rings; fore femur mostly dark brown with basal and apical yellow tips, row of 6–7 anteroventral setae present, row of 3–4 dorsal setae present. Mid and hind femora with basal and subapical yellow rings. All tibiae with basal, medial and apical yellow rings. Preapical dorsal setae present in all tibiae. Ventrally strong medial spur present. All tarsi brown. Wing ( Fig. 3D ). Length, 4.8–5 mm, width, 2.1–2.2 mm; brownish, with reticulated pattern of hyaline spots. C extending to M; costal spinules extending to R 2+3.Veins yellow to brown. R 2+3 and R 4+5 apically divergent; R 4+5 and M 1 converging, but parallel at apex; r-m vein broadly darkened, reaching the discal cell in 2/3 of its length. Halter orange. Abdomen ( Fig. 3C ). Tergites uniformly dark brown with grey whitish pollinosity, covered by setulae slightly longer along posterior margin. Male terminalia ( Figs 4A–C ). Epandrium concave; setulose; 1.35X longer than high; inner margin rounded. Two surstylar lobes articulated with the distolateral margin of epandrium; inner surstylar lobe sclerotized, 1/2 the length of the outer surstylar lobe, curved in posterior view, with few inner distal setulae; outer surstylar lobe weakly sclerotized, laminar in posterior view, with scattered setulae on all surfaces. Cercus elongated, setose, microtrichia present. Subepandrial sclerite present as a narrowly sclerotized connection between surstylar lobes in posterior view; articulated with hypandrial arms. Hypandrium 1.1X longer than maximum width, subtriangular in lateral view, U-shaped in ventral view; extending laterally around phallapodeme, connecting with epandrium. Pregonites fused to each other and partially fused to hypandrium; bilobed distally in lateral view; pilose, excepting margin merged with hypandrium; inner margin rounded. Pregonite arms projecting up to level of distiphallus, scattered setae at apex. Postgonite articulated subapically to pregonite and to phallus, reniform, setae absent. Phallapodeme elongated, anterior extremity extending beyond the distal margin of the hypandrium; 2.1X length of hypandrium; Y-shaped. Phallus consisting of a sclerotized portion and a membranous portion. Basiphallus not fused to phallapodeme, curved, almost meeting at apex. Distiphallus subdivided into a pilose hemispherical capsule and a set of membranes projecting ventrally. Female terminalia ( Figs 8A–B ). Tergite 6 broad, 2X wider than long, sclerotized, with sparse setae. Sternite 6 with thin sclerite on anterior margin, sclerotized, setose. Tergite 7 convex in dorsal view, weakly fused with sternite 7. Sternite 7 with D-shaped sclerite, bare. Segment 8 tubular, 3X longer than wide, setulose. Epiproct and hypoproct small, plate-like. Cerci setose, separated, elongated and thin.

Etymology. The species epithet honors Diego Aguilar Fachin, a Brazilian dipterist and a dear friend who has made impressive contributions to the knowledge of Stratiomyidae and other groups of flies.

Distribution. NT: Costa Rica.

Comments. Neotraginops fachini sp. nov. differs from the other described species of the genus mainly by the pilose pregonite and the particularly large ocellar tubercle, which occupies the entire vertex. This is the first species of Neotraginops recorded for Costa Rica, although the genus was recorded by Gaimari (2010).

Figures

FIGURES 2A–C. Neotraginops fachini sp. nov., holotype ♂. A. habitus, lateral view; B. head, frontal view; C. head, dorsal view. Scale bar: 0.5 mm.

FIGURES 3A–D. Neotraginops fachini sp. nov., holotype ♂. A. head, lateral view; B. thorax, dorsal view; C. abdomen, dorsal view; D. wing. Scale bar: 0.5 mm.

FIGURES 4A–C. Neotraginops fachini sp. nov., holotype ♂, male terminalia. A. posterior view; B. ventral view; C. lateral view. Abbreviations: cerc, cercus; epand, epandrium; goncx apod, gonocoxal apodeme; hypd, hypandrium; inner surst lb, inner surstylar lobe; outer surst lb, outer surstylar lobe; pgt, postgonite; ph, phallus; phapod, phallapodeme; preg, pregonite; subpand scl, subepandrial sclerite.

FIGURES 8A–D. Female terminalia. A–B. Neotraginops fachini sp. nov., paratype ♀. A. dorsal view; B. ventral view. C–D. Neotraginops arikemi sp. nov., paratype ♀. C. dorsal view; D. ventral view.Abrevietions: cerc, cercus; epiprct, epiproct; hyprct, hypoproct; sg, segment; st, sternite; tg, tergite. Scale bar: 0.5 mm.