Asindulum Latreille
Creators: name: Fitzgerald, Scott J.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Keroplatidae
Asindulum

description: Key to Asindulum and Nearctic Macrorrhyncha (based on males, but including characters to help distinguish females where possible)
1a CuP distinctly reaching wing margin (Fig. 6 top, Fig. 18); anterior spiracle without posterior setae (Figs. 2, 4)… (Asindulum)................................................................................................... 2
1b CuP not or not distinctly reaching wing margin (Figs. 66, 75); anterior spiracle with short black posterior setae (Fig. 77)… (Macrorrhyncha)..................................................................................... 7
2a Labellum very long and slender, reaching well beyond apex of fore coxa (Figs. 2, 5); male tergite 9 with two pairs of lobes: a posterolateral and a posterosubmedian pair (Figs. 7, 9)....................................................... 3
2b Labellum shorter and stouter, at most reaching slightly beyond apex of fore coxa (Fig. 4); male tergite 9 with or without posterolateral lobes and lacking posterosubmedian lobes (e.g., Figs. 19, 30, 39)................................... 4
3a Coxae black (Figs. 51–52); posterosubmedian lobes of male tergite 9 more spathulate apically (Figs. 55, 57), gonostylus with a pronounced basolateral swelling (Figs. 58–59); Palearctic............................... Asindulum nigrum Latreille
3b Coxae cream to pale yellowish (Fig. 5); posterosubmedian lobes of male tergite 9 less spathulate apically (Figs. 7, 9), gonostylus without a pronounced basolateral swelling (Fig. 10); Nearctic ............................... Asindulum coxale Loew
4a Male tergite 9 without posterolateral lobes, gonocoxites posteromedially drawn out into a pair of finger-like lobes each bearing several setae (Matile 1975, figs. 7–8, and Chandler 1994, figs. 17–18); female terminalia (Fig. 63 and as in Matile 1975, fig. 10); Palearctic, Israel .............................................................. Asindulum theodori Matile
4b Male tergite 9 with well-developed posterolateral lobes (Figs. 19, 21, 30, 32, 39, 41) and terminalia not as above; Nearctic .. 5
5a Posterolateral corners of male tergite 9 each produced into a laterally-compressed, dorsally-curved hook/spine (Figs. 19, 21, 39, 41); usually larger species (wing length in males 5.5–7.0 mm, females 7.0–9.0 mm) with abdomen usually yellow to orangish on one half and darker on the other half (but see variation in descriptions) (Figs. 16, 25, 38, 50); in ventral view, female sternite 10 with or without a posterior notch...................................................................... 6
5b Posterolateral corners of male tergite 9 not produced into a dorsally-curved hook/spine, male terminalia as Figs. 30–35; usually smaller species (wing length ca. 4.0 mm) with abdominal color not distinctly darker at one end (though only known from two specimens); in ventral view, female sternite 10 without a posterior notch................... Asindulum mexicanum n. sp.
6a Posterolateral corner of male tergite 9 with broad, laterally-flattened, apically hooked lobe (Figs. 19, 21); lateral lobes of gonocoxites apically broadly truncate and without a thumb-like lobe (dorsal process, dp) on the dorsal edge (Fig. 21); female sternite 10 without a distinct posterior notch (Figs. 26–27); abdominal color rather variable. Pale morph males usually with abdominal segments 1–4 yellow and remainder of segments blackish/brownish-yellow (Fig. 16) and female abdomen mostly yellowish with brown posterior borders on tergites 1–3 (Fig. 25). Dark morph males with all tergites dark brown to black except tergite 4 yellowish and females with tergites 1–3 dark brown to black and remainder yellowish... Asindulum flavidum n. sp.
6b Posterolateral corner of male tergite 9 with narrow, laterally-flattened, hook-like lobe (Figs. 39, 41); lateral lobes of gonocoxites apically broadly rounded and with a thumb-like lobe (dorsal process, dp) on the dorsal edge (Fig. 41); female sternite 10 with a posterior notch (Figs. 47–48); abdomen of both sexes with segments 1–3 usually dark brown and remaining segments orangish to brownish-orange (segment 4 typically brightest) (Figs. 38, 50) though some females with even the brown tergites tinged with yellowish-orange............................................................... Asindulum montanum Röder
7a Thorax yellow and mouthparts terminating near apex of fore coxae (Figs. 75–76); male terminalia as Figs. 78–83; female unknown............................................................................ M. vockerothi n. sp.
7b Thorax dark brown and mouthparts terminating far beyond apex of fore coxae (Figs. 64–65); male terminalia as Figs. 67–72; female (tentatively associated; see Comments under this species)................................. M. borealis n. sp.
description: Published as part of Fitzgerald, Scott J., 2023, The Nearctic species of Asindulum Latreille and Macrorrhyncha Winnertz (Diptera: Keroplatidae), pp. 72-106 in Zootaxa 5351 (1) on page 74, DOI: 10.11646/zootaxa.5351.1.3, http://zenodo.org/record/8391146