Neostenoptera Meunier, 1902

Plakidas, John D., Nguyen, Nhu H. & Ferro, Michael L., 2022, A new species of Neostenoptera Meunier (Diptera: Cecidomyiidae: Winnertziinae) from Hawai‘i, Insecta Mundi 2022 (941), pp. 1-12 : 9

Key to the species of Neostenoptera Meunier

In the following key morphological traits, which readily separate both males and females of N. appalachiensis and N. hawaiiensis , are presented. These two species are easily separated by comparing male genitalia or number of flagellomeres in the females.

1. Wing uniformly elliptical ( Fig. 13 ); vein R1 prominent and distinctly separate from costa......................................................................... N. kiefferi ( Meunier, 1902)

— Wing not uniformly elliptical ( Fig. 7 ); vein R1 close to the costa................................ 2

2. Vein R5 visible near midlength; scutellum with two setae............... N. congoensis Gagné, 1979

— Vein R5 clearly absent; scutellum without setae.............................................. 3

3. Male genitalia with apex of ejaculatory apodeme forked ( Fig. 8 ); female with nine flagellomeres, the ninth flagellomere with a long, dark brown apical seta ( Fig. 4 ).................................................................. N. hawaiiensis Plakidas, Nguyen, and Ferro , new species

— Male genitalia with apex of ejaculatory apodeme tubular ( Fig. 14 ); female with ten flagellomeres, the tenth flagellomere with a short coniform seta ( Fig. 15 ).................................................................................... N. appalachiensis Plakidas and Ferro, 2016

Figures

Figures 13–15. Neostenoptera spp. 13) Neostenoptera kiefferi, male wing (after Meunier 1901: Fig. 19). 14) Neostenoptera appalachiensis, male genitalia, arrow to tubular apex of ejaculatory apodeme. 15) Neostenoptera appalachiensis, female flagellomeres 8–10, arrow to coniform seta at apex of tenth flagellomere.

Figures 7–11. Neostenoptera hawaiiensis. 7) Male wing. 8) Male genitalia, dorsal, arrow points to the apex of the forked ejaculatory apodeme. 9–10) Male genitalia, variation in shape of tegmen and apex of ejaculatory apodeme. 11) Male genitalia, detailing the shape of the ninth sternite, ventral.

Figures 1–6. Neostenoptera hawaiiensis. 1) Male scape to flagellomere 2. 2–3) Variation in male flagellomeres 10+11. 2) Arrow points to the variation in the stem of flagellomere 10. 3) Arrow points to the longer stem of flagellomere 10. 4) Female flagellomeres 8+9. 5) Female flagellomeres 3+4. 6) Male, four-segmented tarsus, midleg, arrow to empodium.