Pauximyia oliveirai, Limeira-De-Oliveira & Marques & Gaimari & Rafael, 2020

Limeira-De-Oliveira, Francisco, Marques, Dayse Willkenia A., Gaimari, Stephen D. & Rafael, José A., 2020, Pauximyia, a new genus of Odiniidae (Diptera: Acalyptratae) with description of two new species from Brazil, Zootaxa 4728 (2), pp. 227-236 : 229-233

Pauximyia oliveirai sp. nov.

( Figs 1 – 12 )

Etymology. Named in honor to the Dr. Márcio Luiz de Oliveira (Researcher and Curator of the INPA Invertebrate Collection).

Holotype ♂. Body length 3.4 mm.

Diagnosis. Lunule with velvet black band through upper part of antennal bases and medially through upper lunule, dorsolaterally with silver-grey pubescence. Antennal scape, pedicel and arista beyond first segment dark brown. Gena yellowish, dark posterolaterally. Palpus dark yellow with dense black setae. Hind femur moderately thickened, anteroventral surface with row of 7 setae, middle one strongest. Epandrium with dense setae. Hypandrium almost straight. Gonocoxal apodeme somewhat concave in lateral view, posterior margin with small concavity, almost straight.

Head ( Figs 1–4 ). Height 1.70X the length, width 2.59X the length and 1.53X wider than high. Eye only slightly higher than long. Postocellar setae strong, divergent. Ocellar triangle goldish-yellow to brownish-yellow pruinose, setulose; posterior ocelli slightly closer together than the distance between posterior and anterior ocelli; ocellar setae strong (as strong as anterior orbital seta). Medial and lateral vertical setae present, strong. Postcranium not concave in dorsal view. Frons 1.80X wider than long, brown, with goldish-yellow pruinosity. Fronto-orbital plate silvery-yellow; sparsely setulose; with 3 fronto-orbital setae, anterior pair inclinate and two posterior reclinate. All macrosetae with oblong alveolae slightly raised, darkened lip in same direction as setal orientation. Lunule with velvet black band through upper part of antennal bases and medially through upper lunule, dorso-laterally silvergrey pubescence; lacking setulae. Antenna with scape and pedicel dark brown (brown in the paratype), postpedicel yellow including first segment of arista, remainder of arista black, arista pubescent; antennal bases separated by distance less than diameter of single antennal socket. Face yellowish, white pruinose, including antennal grooves. Oral vibrissa strong, with 1 subvibrissal seta. Gena yellowish laterally with white pruinosity, dark posterolaterally with grey pruinosity; with 5–6 strong setae, none upturned; setulose, genal groove area concolorous with face. Palpus dark yellow, slightly flattened laterally, with dense stout setulae (palpus yellow with sparse black setae in the paratype). Prementum and labellum light yellow, with light setulae.

Thorax ( Figs 1, 4 ). All macrosetae with alveolae slightly oblong and slightly raised, with margins darkened. Scutum greyish to greyish brown, with dark-brown markings, with irregular narrow brown pruinose medial vitta (in the paratype, uniform and wide through 2nd (from posterior to anterior) dorsocentral seta); medial vitta with denser setulae than adjacent areas; with lateral brown pruinose vitta from anterior part of scutum (dorsal of postpronotum) through supra-alar presutural and intra-alar (first postsutural) and supra-alar, subtriangular in lateral view; lateral portion of scutum (below intra-alar area) lacking setulae. Scutellum concolorous with scutum, with anterior 1/3 brown, slightly W-shaped, laterally encompassing the anterior pair of scutellar setae; arched dorsally. Chaetotaxy: 1+4 dorsocentrals (presutural + postsuturals; posteriormost seta strongest), 1 prescutellar acrostichal (as strong as anterior dorsocentral), 1 postpronotal (along with few setulae, mainly above), 2 notopleurals, 2 postsutural intraalars (in posterior part of scutum, posterior one stronger), 1 presutural supra-alar, 2 postsutural supra-alars (posterior one stronger; lacking additional setulae between), 1 postalar very strong (additional 0–2 very small setulae posteriorly) and 2 scutellars. Pleuron above katepisternum lacking setae or setulae except for 1 propleural seta; silvery-grey pruinose except for a thin longitudinal brown pruinose stripe through anepisternum. Katepisternum brown, more sparsely pruinose, with 3 strong setae along dorsal edge, in addition to numerous setulae. Legs ( Fig. 1 ). Brown, except yellow at apical tips of femora and proximal ends of tibiae. Hind femur moderately thickened, anteroventral surface with row of 7 setae, middle one strongest. Tibia thickened distally; fore tibia with 1 dorsal and 3 ventral weak spurs; mid tibia with 2 strong spurs and hind tibia with 2 weak spurs. Wing ( Fig. 7 ). Length 2.80 mm; width 1.40 mm; 2X longer than width. Vein C extended to R 4+5. Costal spinules extended to less than halfway between R 2+3 and R 4+5. Membrane faintly brown infuscated, with distinct dark spots along r-m and dm-m crossveins; slightly darkened along bm-m crossvein, and fork of Rs. Halter yellow.

Abdomen ( Fig. 6 ). Silvery-grey to greyish pruinose with large brown lateral spots. Syntergite 1+2 dark-brown pruinose. Tergites 3–5 ( Fig. 6 ) silvery-grey to greyish pruinose, with large paired spots of brown pruinosity, encompassing the anterior borders of the tergites, but not reaching the posterior edges; additionally with smaller brown spots laterally. Tergites 1–5 setulose with longer setulae along posterior edges and laterally on tergite 2; alveolae of setulae along posterior edges brown. Tergite 6 ( Figs 8, 10 ) with membranous appearance, bare. Sternite 6 asymmetrical, apparently connected anterodorsally to syntergosternite 7+8. Syntergosternite 7+8 ( Figs 8, 10, 12 ) bare, weakly sclerotized, with membranous appearance, 8X wider than long.

Male genitalia ( Figs 8–12 ). Epandrium subglobose, wider than long, with dense setae, longer at the anterior margin (sparser setae in the paratype). Surstylus as two small lobes fixed (not articulated) to epandrium; inner and outer surstylar lobes subequal in size. Hypandrium longer than maximum width; subtriangular (tapered anteriorly), lateral edges longer basally in lateral view, extended laterally around phallapodeme and phallus, almost straight (anterior half ventrally curved in the paratype); area between hypandrium and gonocoxal apodeme lightly sclerotized, as a point of weakness. Gonocoxal apodeme concave in ventral view; posterior margin with small concavity, almost straight with light setulae distally. Pregonite broad with slight medial curve. Postgonite as a small lobe directed ventrally. Phallus bulbous, membranous, covered with tiny spicules. Phallapodeme rod-like. Cercus small, setulose.

Female. Unknown.

Type material. HOLOTYPE ♂ (pinned, very good condition, abdomen dissected, in small vial with glycerin on same pin), deposited at INPA, with the following labels: “ BRASIL, Amazonas, S.[ão] G.[abriel] da Cachoeira, Rio Uaupés, PEF.[= Pelotão Especial de Fronteira] Querari , 15–30.vii.2017, 01°04’51.3”N, 69°50’32.1”W, M. Oliveira & T. Mahlmann leg., Arm.[adilha] Malaise Grande” . PARATYPES: idem, S.[anta] Izadel (sic) Isabel do R . [io] Negro, Maturacá 11–13.x.1990; Arm. [adilha] Malaise; J.A. Rafael (1♂, CZMA, abdomen dissected in mi- crovial with glycerin on same pin, left wing mounted in Canada balsam on microslide on same pin) ; idem, Acre, Bujari, FES Antimary , 9°20’01”S, 68°19’17”W, 3.viii–8.ix.2016, Malaise grande, E. F. Morato & J. A. Rafael cols. Rede BIA (1♂, MNRJ) ; idem, 18–31.ix.2017 , idem (1♂, CSCA) .

Distribution. Brazil (Acre, Amazonas).

Remarks. Pauximyia oliveirai sp. nov. differs from Pauximyia vidali sp. nov. in having the lunule with velvet black band through upper part of antennal bases (lunule entirely white in P. vidali ); the hind tibia almost as long as fore tibia (hind tibia about half length of fore tibia in P. vidali ); tergite 6 with membranous appearance in P. oliveirai (tergite 6 sclerotized and long in P. vidali ); sternite 6 asymmetrical, apparently connected anterodorsally to syntergosternite 7+8 (sternite 6 absent in P. vidali ); the gonocoxal apodeme terminating distally as small concavity, almost straight (gonocoxal apodeme terminating distally as a broad triangle in P. vidali ).

Variation. Male (n = 2). Body length 3.40–3.60, mean 3.50 mm; Head Height 1.40–1.70X the length, mean 1.55X; width 1.90–2.59X the length, mean 2.24X; 1.37–1.53X wider than high, mean 1.45X; Lunule 0.18–0.20 mm height, mean 0.19; Wing length 2.80–3.30, mean 3.05 mm; wing width 1.40.

Figures

FIGURES 1–7. Pauximyia oliveirai sp. nov., Holotype ♂. 1, habitus, lateral view (abdomen dissected); 2, head, lateral view; 3, head, frontal view; 4, head, frontal view, inclined; 5, thorax, dorsal view; 6, abdomen; 7, wing. Abbreviations: bm-m—basal medial crossvein; CuA—anterior branch of cubital vein; CuA+CuP—anterior branch of cubital vein + posterior branch of cubital vein; dm-m—discal medial crossvein; M1—first branch of media; M4—fourth branch of media; R2+3—second branch of radius; R4+5—third branch of radius; r-m—radial–medial crossvein.

FIGURES 8–12. Pauximyia oliveirai sp. nov., Holotype ♂. 8, terminalia, dorsal view; 9, epandrium, cercus and surstylar lobes, posterior view; 10, terminalia, lateral view; 11, epandrium, hypandrium, pregonite, postgonite and phallus, ventral view; 12, terminalia, lateral view, inclined.