Neotraginops arikemi, 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 : 180-181

Neotraginops arikemi sp. nov.

( Figs 5–7 )

Diagnosis. Ocellar tubercle well developed, with several rows of setae from the posterior ocelli. Sclerotized portion of the phallus curved, lying apically, projecting ventrally. Pregonite with a small notch.

Material examined. Holotype (left wing slide-mounted, terminalia in vial), ♂ ( MZUSP): BRAZIL, Rondônia, 62 km SE Ariquemes , W. J. Hanson, 7–18.xi.1995 . Paratypes: BRAZIL, Rondônia, 62 km SE Ariquemes , W. J. Hanson, 8–20.xi.1995 (1♀ (terminalia in vial), LACM) , 22–31.xi.1997 (1♂, LACM) , 5–16.vi.1996 (1♀, CSCA) .

Description. Adults ♂, ♀. Body length, 3.6–3.8 mm. Head ( Figs 5A–C , 6A ). Higher than long in lateral view, wider than high in anterior view. Height, 1.83–1.85X length; height, 0.93–0.94X width. Eye slightly higher than long in lateral view. Ocellar tubercle dark brown, covered by several rows of setulae on surface from anterior ocellus through the posterior half of vertex. Frons 5.0X wider than long. Frons anteriorly orange, brownish on lateral margins of ocellar tubercle, extending until third fronto-orbital. Brown stripe from posterior portion of ocellar tubercle to postcranium, narrowing at postocellar region, where it widens. 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 two-third of length of frons, lateroventrally bordered by golden-yellow pollinosity. Face with greyish pollinosity, with two interconnected longitudinal dark brown stripes. Oral vibrissa well developed, plus 2 subvibrissal setae, surrounded by subvibrissal setulae. Parafacial covered by whitish pollinosity, a median dark brown spot ventrally extending to the genal groove area and gena, almost reaching the ventral margin of the gena. Gena broad, brown, covered by greyish pollinosity plus scattered setulae. Genal seta present. Genal groove area yellow. Antennal scape and pedicel dark orange; first flagellomere orange, rounded, slightly longer than high, with scattered hairs; arista pubescent, mostly dark brown, basal end orange. Clypeus brown, with golden yellow pollinosity, two black spots laterally. Palpus spatulate, orange, with scattered setulae. Proboscis brown with dark yellow setulae. Thorax ( Figs 5A , 6B ). Mesonotum length, 1.43–1.44 mm; width, 1.1–1.3 mm. Chaetotaxy: 3 postpronotals (middle one 1.5X longer than other two), anepisternum and anepimeron bare, 2 propleurals (anterior longer than posterior), 2 notopleurals, 3 katepisternals (anterior one longer, median and posterior of equal length), 1 presutural supra-alar, 2 postsutural supra-alars, 1 postalar, 2 intra-alars, 4 dorsocentrals (posterior longer, 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 bases, last two connected to medial vitta; 12 rows of acrostichals present. Pleuron covered by greyish pollinosity with complex pattern of brown pollinosity. Postpronotal lobe with anteroventral margin dark brown. Anepisternum dark brown, with three greyish pollinosity halos. Katepisternum brown from point of insertion of katepisternals, setulose. Scutellum brown in distal 2/3 with yellow central triangular area, silvery-grey basally, disc densely setulose. Legs ( Fig. 5A ) Mostly brown, with yellow rings. Fore femur mostly dark brown with apical and basal yellow margins, row of 6–7 anteroventral setae present, row of 3–4 dorsal setae present. Mid and hind femora with basal and subapical yellow rings. Hind femur light brown ventrally, hind tarsus orange ventrally.All tibiae with basal, medial and apical yellow rings. Preapical dorsal setae present in all tibia. Ventrally strong medial spur present. All tarsi brown. Wing ( Fig. 6D ). Length, 4.4–4.5 mm; width, 1.9 mm. Membrane brownish with reticulated pattern of hyaline hourglass-shaped marks. Vein C extending to M; costal spinules extending to R 2+3.Veins yellow to brown. Veins R 2+3 and R 4+5 diverging apically; R 4+5 and M 1 converging; r-m vein broadly darkened, reaching the discal cell in 2/3 of its length. Halter yellow. Male abdomen ( Fig. 6C ). Tergites uniformly dark brown with greyish pollinosity, covered by dark setulae, slightly longer along posterior margin. Male terminalia ( Figs 7A–C ). Epandrium concave, setulose; 1.35X longer than high; inner margin rounded. Surstylus as two articulated lobes with epandrial margin; inner surstylar lobe sclerotized, 3/4 of length of outer surstylar lobe, curved in posterior view, with few inner distal setulae; outer surstylar lobe weakly sclerotized, laminar in posterior view, with scattered setulae in all surfaces. Cercus elongated, setulose, microtrichia present. Subepandrial sclerite present as a narrowly sclerotized connection between surstylar lobes in terminal view; articulated to hypandrial arms. Hypandrium 1.2X longer than maximum width; subtriangular in lateral view; Ushaped in ventral view; extending laterally around phallapodeme and connecting with epandrium. Pregonite fused to each other and partially fused to hypandrium, pilose, except along margin, merged with hypandrium; inner margin rounded. Pregonite arms projecting up to height of distiphallus, with a small notch, scattered setae. Posgonite articulated subapically to pregonite and to phallus, setulose. Phallapodeme elongated, ventral tip overlapping with ventral margin of hypandrium; Y-shaped. Phallus consisting of a sclerotized portion and a membranous portion. Basiphallus not fused to phallapodeme, curved, almost meeting at apex, projecting ventrally. Distiphallus subdivided into a pilose hemispherical capsule and a set of membranes projecting ventrally. Female terminalia ( Figs 8 C-D). Tergite 6 broad, 1.6X wider than long, sclerotized, with sparse setae. Sternite 6 membranous, setose. Tergite 7 weakly fused with sternite 7. Sternite 7 with D-shaped sclerite, bare. Segment 8 tubular, 4.3X longer than wide, setulose. Epiproct and hypoproct small, plate-like. Cerci broken.

Etymology. The specific epithet honors the extinct indigenous tribe Arikeme , that lived in the state of Rondonia, in Brazil.

Distribution. NT: Brazil.

Comments. Neotraginops arikemi sp. nov. differs from the other described species in the genus mainly by the pregonite with a small notch. N. clathratus is readily distinguished from both new species by the frons mostly brown and the surface of the ocellar tubercle completely covered by several rows of setulae. This is the first record of the genus for the Amazon Forest.

Figures

FIGURES 5A–C. Neotraginops arikemi sp. nov., holotype ♂. A. habitus, lateral view; B. head, frontal view; C. head, dorsal view. Scale bar: 0.5 mm.

FIGURES 6A–D. Neotraginops arikemi sp. nov., holotype ♂. A. head, lateral view; B. thorax, dorsal view; C. abdomen, dorsal view; D. wing. Scale bar: 0.5 mm.

FIGURES 7A–C. Neotraginops arikemi 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.