Glabellula Bezzi, 1902

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 : 206

Genus Glabellula Bezzi

Platygaster Zetterstedt, 1837: 54 . Nomen nudum.

Platygaster Zetterstedt, 1838: 574 . Type species: Platygaster arcticus Zetterstedt, 1838 , by monotypy. [Preoccupied by Latreille, 1809.]

Sphaerogaster Zetterstedt, 1842: 232 (new replacement name for Platygaster Zetterstedt, 1838 ). Type species: Platygaster arcticus Zetterstedt, 1838 , automatic. [Not preoccupied by Sturm, 1826.]

Glabella Loew, 1873: 210 . Type species: Glabella femorata Loew, 1873 , by monotypy. [Preoccupied by Swainson, 1840.]

Glabellula Bezzi, 1902: 191 (new replacement name for “ Platygaster ... und Sphaerogaster ... und Glabella ”). Type species: Platygaster arcticus Zetterstedt, 1838 , by subsequent designation (I.C.Z.N., 1989: 148). [Name valid by I.C.Z.N. Code Article 23.9.2.]

Pachyneres Greene, 1924: 62 . Type species: Pachyneres crassicornis Greene, 1924 , by monotypy.

Proglabellula † Hennig, 1966: 15. Type species: Proglabellula electrica Hennig, 1966 , by monotypy.

Diagnosis. Glabellula consists of minute flies, 1−2 mm in length; usually shiny black, with or without yellow markings; pubescence sparse, minute. The genus is distinguished from all other mythicomyiids based on the medial interruption of sclerotization on abdominal tergite 2 and in the wing by the tiny marginal cell of the wing formed by vein R 2+3 joining R 1 well before the costa, combined with cell bm united with cell dm ( Fig. 4 ) (reformulated after the versions presented by Hall & Evenhuis (1984) and Evenhuis (2019)).

Identification key to South American species of Glabellula Bezzi

1 Mesonotum and scutellum entirely dark brown to black, without yellow areas ( Figs 3 , 14 ); tergites dark brown to black without yellow markings ( Figs 2 , 13 )............................................................................ 2

- Mesonotum with submedian fine stripe formed by dense yellowish gray pruinosity and scutellum dark brown with yellow areas on posterior half and on anterior corners ( Fig. 8 ); tergites dark brown to black with yellow markings ( Fig. 7 ).................................................................................................. G. rafaelae sp. nov.

2 Femora dark brown to black; frons slightly depressed medially; female sternite 7 with lateral digitiform projections and medial shallow concave depression on posterior margin ( Fig. 17 )................................... G. catiapatiuae sp. nov.

- Femora dark brown to black with distal extremity dark yellow; frons not medially depressed; female sternite 7 without lateral digitiform projections and with medial deep concave depression on posterior margin ( Fig. 19 )......... G. sarahae sp. nov.

Figures

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 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 6−11. Glabellula rafaelae sp. nov., female, holotype. 6, habitus, lateral view; 7, abdomen, dorsal view; 8, thorax, dorsal view; 9, left wing, ventral view; 10, frons, frontal view; 11, 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.