Glabellula sarahae, Mendes & Evenhuis & Limeira-De-Oliveira & Lamas, 2022

Mendes, Luanna L., Evenhuis, Neal L., Limeira-De-Oliveira, Francisco & Lamas, Carlos J. E., 2022, First record of Glabellula Bezzi (Diptera, Mythicomyiidae: Glabellulinae) in South America, with description of three new species from Brazil, Zootaxa 5124 (2), pp. 205-215 : 211-213

Glabellula sarahae sp. nov.

( Figs 12−16 , 19 )

Diagnosis. Mesonotum, scutellum and tergites entirely dark brown to black, dark yellow distal extremity on the dark brown femora and sternite 7 sub-quadrate with anterior margin slightly sinuous.

Etymology. The specific epithet is a patronym honoring Dr. Sarah Siqueira de Oliveira (Universidade Federal de Goiás - UFG), for her important contribution on taxonomy and systematics of Diptera .

Description. Holotype female ( Fig. 12 ). Body length: 1.71 mm; wing length: 1.35 mm. Head. Dark brown to black; eyes separated at vertex by approximately 1.5X distance between posterior ocelli; ocellar triangle shiny, ocelli yellow to dark yellow; frons light brown, more clear in ventral and lateral margins, shiny, without depressed medially, without setae laterally; face yellow dark to light brown, with brown mark medially, slightly projecting beyond eye in lateral view; proboscis light brown to brown, smaller than head length; oral cavity and margin yellow; postcranium shiny; setae whitish yellow; antenna brown to dark brown, yellowish pruinosity; scape minute; pedicel oval; first flagellomere sub-elliptical, about 1.25X longer than width; second flagellomere small, dropshaped, about one-half width of first one; stylus absent. Thorax ( Fig. 14 ). Mesonotum and scutellum dark brown to black, subshiny to shiny, covered with whitish yellow setae; yellow markings on: postpronotal lobe, postalar callus and thin line along transverse suture; pleura dark brown to black, shiny, with yellow markings on: proepimeron; mark on dorsal region of anepisternum, dorsal margin of katepisternum and dorsal 1/3 of meron. Legs ( Fig. 12 ). Dark brown to black; tibiae with distal extremity clearer; tarsi dark yellow, last tarsomeres darker. Wing ( Fig. 15 ). Hyaline; costal vein, radial veins and crossvein r-m light brown, remainding veins pale yellow to translucid; costal vein ending at 1/4 distance between veins R 4+5 and M 1; vein Sc incomplete, evanescent, ending at level of Rs origin; Rs evanescent at connection with R 1; R 4+5 slightly curved, ending near end of M 1; M 1 slightly curved toward wing margin; M 2 and M 4 straight to wing margin; CuP converging towards CuA; A 1 evanescent towards wing margin; cell cua opened at wing margin. Halter pale yellow. Abdomen ( Fig. 13 ). Dark brown to black, shiny, covered with yellowish setae uniform in length; sternite 7 ( Fig. 19 ) sub-quadrate with anterior margin slightly sinuous, posterior margin with submedian projection and wide deep concavity medially, setae with various lengths, slightly longer on distal 1/3; sternite 8 ( Fig. 19 ) reduced, sub-trapezoidal with lateral stricture on apical 1/3 and shallow concavity on posterior margin. Terminalia ( Fig. 16 ). Genital fork V-shaped, anterior margin arched with digitiform projection, posterior margin bifurcate, inner arms convergent with central circular orifice, outer arms divergent, longer and uniform toward apex. Common duct short, about 20X smaller than spermatheca length, basal plate hyaline; proximal spermathecal duct reduced or absent; sperm pump tubular-shaped and slender with apical sclerotized collars well developed and formed by two level structure complex, proximally surrounded by membranous fringe and distally by well sclerotized horseshoe-shaped fold; without amorphous membranous extroversion arising from sclerotized collars apex; distal spermathecal duct short and thin, about 0.5X sperm pump length, with two elliptical swellings surrounded by minute glandular trichomes; spermathecal about 1/3 sperm pump length, sclerotized in distal 1/3, brown, with glandular trichomes at apex.

Male. Unknown.

Geographical records. This species is known only from the type-locality, which is inserted in the Cerrado biome of the state of Goiás, Brazil ( Fig. 20 ).

Type material. HOLOTYPE ♀ deposited in MZUSP: Brasil, GO [= Goiás], Silvânia, Floresta Nacional de Silvânia, Malaise - Cerrado s.s.3, S16°38′15.3″ W048°39′37.1 ″, 30.viii.2019 – 27.ix.2019, Cols. Oliveira, R. & Lopes, W. (1♀ MZUSP) . PARATYPE: idem, (1♀ MZUSP) .

Figures

FIGURE 20. Geographical records of new species of Glabellula known from Brazil.

FIGURES 12−16. Glabellula sarahae sp. nov., female. 12, habitus, lateral view, holotype; 13, abdomen, dorsal view, holotype; 14, thorax, dorsal view, paratype; 15, left wing, ventral view, paratype; 16, terminalia, paratype. Scale 0.2 mm.

FIGURES 17−19. Sternites 7 and 8 of the new species of Glabellula, ventral view. 17, G. catiapatiuae sp. nov.; 18, G. rafaelae sp. nov.; 19, G. sarahae sp. nov. Scale 0.2 mm.