Pieza yeatesi Mendes, Lamas, Evenhuis

Mendes, Luanna L., Lamas, Carlos J. E., Evenhuis, Neal L. & Limeira-De-Oliveira, Francisco, 2019, New Pieza Evenhuis (Diptera, Mythicomyiidae, Mythicomyiinae) from Northeast Brazil, Zootaxa 4629 (1), pp. 1-25 : 20-22

Pieza yeatesi Mendes, Lamas, Evenhuis & Limeira-de-Oliveira, sp. nov.

( Figs 61–68 )

Diagnosis. Mesonotum with narrow yellow supra-alar area ( Fig. 62 ). Gonocoxite subquadrate with anterior margin straight, small spiniform projections latero-posteriorly, anteroventral protuberance setose medially in ventral view ( Fig. 65 ); gonocoxite bilobed, medially depressed; anterior lobe setose posteriorly in lateral view ( Fig. 66 ). Gonostylus slender, triangular base wide, crossed in ventral view ( Fig. 65 ).

Description of holotype male ( Fig. 61 ). Body length: 1.2 mm. Wing length: 1.06 mm. Head. Eyes separated at vertex by approximately 2.5X distance between posterior ocelli. Ocellar triangle dark brown, subshiny. Frons dorsal ¼ dark brown, ¾ ventral yellow to dark yellow, median depression brown on dorsal ⅔; setae brown, small, lateral; face yellow. Proboscis light brown to brown, almost same length as head; oral cavity yellow, light brown marginally. Postcranium dark brown, subshiny, sparsely pruinose on median occipital sclerite; setae brown. Antenna with second flagellomere subequal in length to maximum width of first flagellomere. Thorax. Mesonotum subshiny, sparsely pruinose medially as a stripe from anterior region to base of wing; setae brown, erect and dense; mesonotum with narrow yellow mark on supra-alar area ( Fig. 62 ); prealar and notopleural setae dark brown; strong. Scutellum light brown to brown, setae brown. Pleura yellow on the proepimeron, anterodorsal and dorsal margin of anepisternum, dorsal ¼ of katepisternum and about dorsal ½ of meron ( Fig. 63 ); posterodorsal ⅓ of katepi- sternum shiny, glabrous. Legs ( Fig. 61 ). Coxae brown to dark brown on dorsal surface, yellow ventrally. Femora dark brown, distal ¼ yellow. Tarsi yellow, tarsomeres II−V dark brown. Wing. Hyaline, except in the ⅓ proximal infuscated brown; costal vein ending at ⅓ proximal distance between veins R 4+5 and M 1; vein R 2+3 arising from Rs at approximately 60° angle, crossvein m-m about ⅓ length of crossvein r-m. Left halter broken; right halter mostly yellow. Abdomen. Brown to dark brown, subshiny; tergites III−VII with plaques paler and shinier than surround- ings, small, glabrous and dispersed; setae yellow, uniform in length; tergite I without yellow posterolateral margin; tergites II–VII with yellow to pale yellow band on posterior margins, more intense on tergites IV–VII. Sternites brown with yellow band on posterior margins. Terminalia. Epandrium bulging in ventral view ( Fig. 65 ), ventral margin about 2.0X longer than dorsal margin, anterior margin sinuous, setose on most of surface, except on anterior margin in lateral view ( Fig. 66 ); epandrium with outer margin rounded, inner margin subtriangular and sinuous in posterior view ( Fig. 68 ). Pseudo-surstylus convergent, pointed at apex in ventral and posterior views ( Figs 65, 68 ). Cercus oval, lateral margin juxtaposed to inner margin of epandrium strongly sclerotized, setae dispersed in posterior view ( Fig. 68 ), subtriangular, projecting posteriorly in lateral view ( Fig. 66 ). Ejaculatory apodeme almost as long as length of anterior arm of parameral sheath, more heavily sclerotized on longitudinal axis, medial arms subquadrate, tapering proximally, apexes rounded, almost as wide as long in ventral view ( Fig. 65 ), anterior end oval, not curved dorsally, ventromedial projection subrectangular directed posteriorly, apex truncate in lateral view ( Fig. 66 ). Lateral ejaculatory process uniformly sclerotized, sinuous in ventral view ( Fig. 65 ), curved posteriorly in lateral view ( Fig. 66 ). Phallus funnel-shaped, anterior margin flat with deep median notch in ventral view ( Fig. 65 ); basiphallus about 2.0X longer than distiphallus in ventral view ( Fig. 65 ), distiphallus simple with only one opening. Anterior arm of parameral sheath with a little more than distal ½ almost 2.0X wider than proximal ½ in ventral view ( Fig. 65 ), sclerotization stronger on internal margin. Gonocoxite subquadrate, anterior margin straight, projections spiniform, small latero-posteriorly, anteroventral protuberance medially setose in ventral view ( Fig. 65 ); gonocoxite with anterodorsal margin deeply concave, anteroventral margin setose in anteroventral view ( Fig. 67 ), bilobed, medially depressed, anterior lobe setose posteriorly in lateral view ( Fig. 66 ). Gonostylus slender, base triangular wide, crossing each other in ventral view ( Fig. 65 ). Female. Unknown.

Variation (n = 2). Body length: 1.20–1.35 mm. Wing length: 1.06–1.07 mm. Wing of paratype ( Fig. 64 ): infuscated brown; costal vein ending at proximal ⅓ distance between veins R 4+5 and M 1; vein R 2+3 arising from Rs at approximately 70° angle, crossvein m-m about ⅓ length of crossvein r-m.

Etymology. The specific epithet honors Dr. David K. Yeates, who has contributed substantially to the study of Diptera .

Type material. HOLOTYPE ♂: Brazil, MA[= Maranhão], Carolina, PARNA [=Parque Nacional] Chapada das Mesas, Riacho Sucuruiu , 240 m, 07°07′05″S, 47°18′31″W / Armadilha Malaise, 01–10.viii.2013, J.A. Rafael, F. Limeira-de-Oliveira, T.T.A. Silva, cols./ MYTH 117 / Holotype ♂ Pieza yeatesi Mendes, Lamas, Evenhuis & Limeira-de-Oliveira ( CZMA) . PARATYPE: idem, 15–31.vii.2013 (pinned: 1♂ CZMA) .

Geographical record. This species is known only from the Brazilian state of Maranhão ( Fig. 69 ), where the type series was collected in the Cerrado biome.

Remarks. Pieza yeatesi sp. nov. is similar to P. aurislepus sp. nov. in having the gonostylus simple, not trifurcate ( Figs 14 , 65 ). Pieza yeatesi sp. nov. differs from P. aurislepus sp. nov. in the oval cerci without spiniform distal portion directed posteriorly ( Figs 66, 68 ) (cerci sub-hemispherical with distal end spiniform directed posteriorly in P. aurislepus sp. nov., Figs 15, 17 ); gonocoxite subquadrate in ventral view ( Fig. 65 ) (gonocoxite subtrapezoidal in P. aurislepus sp. nov. in ventral view, Fig. 14 ); gonostylus triangular at base, slender distally, not surpassing posterior margin of epandrium in ventral view ( Fig. 65 ) (gonostylus lanceolate on the tips, surpassing posterior margin of epandrium in P. aurislepus sp. nov. in ventral view, Fig. 14 ).

Figures

FIGURE 69. Geographical records of species of Pieza known from Brazil.

FIGURES 61–68. Pieza yeatesi sp. nov. 61, habitus male, holotype; 62, mesonotum, dorsal view; 63, pleura; 64, male wing; 65, male terminalia, ventral view; 66, terminalia, lateral view; 67, gonocoxite, anteroventral view; 68, epandrium and cerci, posterior view. Scale 0.01 mm.

FIGURES 10–17. Pieza aurislepus sp. nov. 10, habitus male, holotype; 11, mesonotum, dorsal view; 12, pleura; 13, male wing; 14, male terminalia, ventral view; 15, male terminalia, lateral view; 16, gonocoxite, anteroventral view; 17, epandrium and cerci, posterior view. Scale 0.01 mm.