Glabellula catiapatiuae, 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 : 207

Glabellula catiapatiuae sp. nov.

( Figs 1−5 , 17 )

Diagnosis. Cell cua at wing margin closed; mesonotum, scutellum, tergites and femora entirely dark brown, without yellow areas; female sternite 7 with lateral digitiform projections.

Etymology. The specific epithet is a patronymic tribute to the late Dr. Catia Antunes de Mello-Patiu (MNRJ) for her great contribution to the knowledge of the diversity of Diptera in South America.

Description. Holotype female ( Fig. 1 ). Body length: 1.54 mm; wing length: 1.25 mm. Head. Dark brown to black; eyes separated at vertex by approximately 1.25X distance between posterior ocelli; ocellar triangle shiny, ocelli yellow to dark yellow; frons dark brown, yellow in ventral and lateral margin, shiny, slightly depressed medially, with small yellow setae laterally; face yellow, 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 subshiny to shiny; setae whitish yellow; antenna brown to dark brown, yellowish pruinose; scape minute; pedicel oval; first flagellomere elliptical, about 1.5X longer than width; second flagellomere very small, about one-half width of first one; stylus absent. Thorax ( Fig. 3 ). 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; anterior and dorsal narrow margin of anepisternum, dorsal margin of katepisternum and dorsal 1/3 of meron. Legs ( Fig. 1 ). Dark brown to black; femora with distal extremity dark yellow; tibiae with proximal and distal extremity dark yellow; tarsi dark yellow, last tarsomere darker. Wing ( Fig. 4 ). Hyaline; costal vein, radial veins and crossvein r-m light brown, remainder veins pale yellow to translucid; costal vein ending at 1/3 distance between veins R 4+5 and M 1; vein Sc incomplete, 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 joining CuA at wing margin; A 1 evanescent towards wing margin; cell cua closed at wing margin. Halter with stem yellow, slightly brownish infuscate, knob yellow with dark brown marks. Abdomen ( Fig. 2 ). Dark brown to black, shiny, covered with yellowish setae uniform in length; sternite 7 ( Fig. 17 ) with anterior margin irregular, posterior margin with lateral digitiform projection and shallow concavity medially, setae uniform in length, slightly longer distally; sternite 8 ( Fig. 17 ) reduced, sub-trapezoidal, with deep concave indentation medially placed on posterior margin. Terminalia ( Fig. 5 ). Genital fork V-shaped, anterior margin arched with small conical projection, posterior margin bifurcate, inner arms convergent with central circular orifice, outer arms divergent, longer and tapered toward apex. Common duct short, about 1/4 length of spermatheca, basal plate hyaline; proximal spermathecal duct reduced or absent; sperm pump tubular-shaped 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; amorphous membranous extroversion arise from sclerotized collars apex; distal spermathecal duct very long and thin, 5.5X longer than sperm pump, with elliptical swelling near base of spermatheca, swelling surrounded by minute, tangled, glandular trichomes; spermatheca as long as sperm pump, 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 Maranhão, Brazil ( Fig. 20 ).

Type material. HOLOTYPE ♀ (dissected) deposited in MZUSP: Brasil, MA [= Maranhão], Mirador, Parque Est. [= Estadual do] Mirador, Base da Geraldina , 416 m, 06º37′48″S, 45º52′49″W / Armadilha Suspensa, 10−20. x.2013, F. Limeira-de-Oliveira, L.L.M. Santos & T. L. Rocha.

Note. Closed cell cua at the wing margin in G. catiapatiuae sp. nov. is uncommon and unique among the other species found in Brazil, in which cell cua is always widely opened. Since this new species is known from only a single female specimen, future investigations of G. catiapatiuae sp. nov. samples are necessary to determine whether the closed cell cua is truly a diagnostic feature or just individual variation.

Figures

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

FIGURES 1−5. Glabellula catiapatiuae sp. nov., female, holotype. 1, habitus, lateral view; 2, abdomen, dorsal view; 3, thorax, dorsal view; 4, left wing, ventral view; 5, terminalia, holotype. 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.