Systenus, Loew, 1857

Ramos-Pastrana, Yardany, Merchan-Vargas, Geraldine Lucia & Soares, Matheus M. M., 2024, First record of the genus Systenus Loew (Diptera: Dolichopodidae) from Colombia, with description of four new species, Zootaxa 5514 (3), pp. 257-272 : 258-259

publication ID	https://doi.org/10.11646/zootaxa.5514.3.3
publication LSID	lsid:zoobank.org:pub:D745608E-E51C-401E-A1A1-3573A24C51BD
DOI	https://doi.org/10.5281/zenodo.13863342
persistent identifier	https://treatment.plazi.org/id/03A71175-FFCB-3C6E-CB96-6CC086B7FEF2
treatment provided by	Plazi (2024-09-27 12:53:54, last updated 2024-11-27 01:30:07)
scientific name	Systenus
status

Treatment

Key to species of Systenus View in CoL from Colombia (males)

1 Metepimeron dark (e.g. Figs 1A View FIGURE 1 , 2A View FIGURE 2 ); abdominal tergites 1–3 mostly metallic green (e.g. Figs 1E View FIGURE 1 , 2E View FIGURE 2 ).................. 3

- Metepimeron yellow ( Figs 5C View FIGURE 5 , 6A View FIGURE 6 ); abdominal tergites 1–3 partly yellow ( Figs 5C View FIGURE 5 , 6A View FIGURE 6 )............................. 2

2 Femur III entirely yellow ( Fig. 5C View FIGURE 5 ); abdominal tergite 3 dorsally metallic green, tergites 4–5 wholly metallic green ( Fig. 5C View FIGURE 5 ); surstylus slightly curved ventrally at apex ( Fig. 5D View FIGURE 5 )............................................ S. flaviatus Naglis View in CoL

- Femur III yellow with dark brown apex ( Fig. 6A View FIGURE 6 ); abdominal tergite 3 mostly yellow ( Fig. 6A View FIGURE 6 ), with T-shaped macula dorsally, tergites 4–5 dark brown; surstylus abruptly curved ventrally at apex ( Fig. 6B View FIGURE 6 )..................... S. naranjensis Bickel View in CoL

3 Antenna wholly dark brown ( Fig. 3A, B View FIGURE 3 ); femora mostly dark brown ( Fig. 3A View FIGURE 3 )....................... S. fuscus sp. nov.

- Antenna partly orangish yellow ( Figs 1B View FIGURE 1 , 2B View FIGURE 2 , 4B View FIGURE 4 ); femora yellow ( Figs 2A View FIGURE 2 , 4A View FIGURE 4 )................................... 4

4 It 3 white ( Fig. 5E View FIGURE 5 ); wing apex brown: posterior wing membrane reduced near apex, with vein M 1 ending on posterior margin ( Fig. 5E View FIGURE 5 )........................................................................... S. maculipennis Bickel View in CoL

- It 3 yellow ( Figs 2A View FIGURE 2 , 4A View FIGURE 4 ); wing apex unmodified, membrane hyaline or brownish ( Figs 1D View FIGURE 1 , 2D View FIGURE 2 )....................... 5

5 Postpedicel wholly orangish yellow at basal 1/2 ( Fig. 6C View FIGURE 6 ); abdominal segment 7 forming peduncle shorter than epandrial capsule ( Fig. 6C View FIGURE 6 ); cercus rectangular, shorter than epandrial capsule ( Fig. 6D View FIGURE 6 )......................... S. parkeri Bickel View in CoL

- Postpedicel partly brownish at basal 1/2 ( Figs 1B View FIGURE 1 , 2B View FIGURE 2 , 4B View FIGURE 4 ); abdominal segment 7 forming peduncle longer than epandrial capsule ( Figs 1A View FIGURE 1 , 2A View FIGURE 2 , 4A View FIGURE 4 ); cercus digitiform, as long or longer than epandrial capsule ( Figs 1F View FIGURE 1 , 2F View FIGURE 2 , 4F View FIGURE 4 )................. 6

6 Palpus mostly brown ( Fig. 1B View FIGURE 1 ); wing membrane light brown ( Fig. 1D View FIGURE 1 ); cercus about 2X longer than epandrial capsule ( Fig. 1F View FIGURE 1 ).................................................................................... S. bickeli sp. nov.

- Palpus yellow ( Fig. 2B View FIGURE 2 ); wing membrane hyaline ( Fig. 2D View FIGURE 2 ); cercus as long or only slightly longer than epandrial capsule ( Figs 2F View FIGURE 2 , 4F View FIGURE 4 )......................................................................................... 7

7 Surstylus longer than cercus and epandrial capsule, ventral edge nearly straight, only slightly narrowed and curved ventrally at apex ( Fig. 5B View FIGURE 5 )............................................................................ S. beatae Naglis View in CoL

- Surstylus shorter or as long as cercus and epandrial capsule and abruptly narrowed towards apex ( Figs 2F View FIGURE 2 , 4F View FIGURE 4 )........... 8

8 Coxa III mostly yellow ( Fig. 4A View FIGURE 4 ); surstylus as long as cercus, wide, abruptly narrowed at apex, with 1 basodorsal acute process ( Fig. 4F, G View FIGURE 4 )............................................................................ S. grossus sp. nov.

- Coxa III mostly brown ( Fig. 2A View FIGURE 2 ); surstylus shorter than cercus, narrow, slightly narrowed at apex, with 1 basodorsal acute process and 1 apicoventral acute process ( Fig. 2F View FIGURE 2 )......................................... S. colombiensis sp. nov.

Figures

FIGURE 1. Systenus bickeli sp. nov., holotype male (before dissection). A. Habitus, lateral view; B. Head, lateral view; C. Thorax, dorsal view; D. Right wing; E. Abdomen, dorsal view; F. Hypopygium, left lateral view. Abbreviations: CuA+CuP = anterior branch of cubital vein + posterior branch of cubital vein; dm = discal medial cell; dm-m = discal medial crossvein; M 1 = first branch of media; M 4 = fourth branch of media; R 1 = anterior branch of radius; R 2+3 = second branch of radius; R = third 4+5 branch of radius.

FIGURE 2. Systenus colombiensis sp. nov., holotype male (before dissection). A. Habitus, lateral view; B. Head, lateral view; C. Thorax, dorsal view; D. Right wing; E. Abdomen, dorsal view; F. Hypopygium, left lateral view.

FIGURE 3. Systenus fuscus sp. nov., holotype male (before dissection). A. Habitus, lateral view; B. Head, lateral view; C. Thorax, dorsal view; D. Left wing; E. Abdomen, dorsal view; F. Hypopygium, left lateral view.

FIGURE 4. Systenus grossus sp. nov., holotype male (before dissection). A. Habitus, lateral view; B. Head, lateral view; C. Thorax, dorsal view; D. Left wing; E. Abdomen, dorsal view; F. Hypopygium, left lateral view; G. Hypopygium, ventral view, arrows indicating the digitiform processes on inner surface of surstylus.

FIGURE 5. A–B. Systenus baetae Naglis, 2000, identified male. A. Habitus, lateral view, arrow indicating metepimeron; B. Hypopygium, left lateral view. C–D. Systenus flaviatus Naglis, 2000, identified Male. C. Habitus, lateral view; D. Hypopygium, left lateral view. Systenus maculipennis Bickel, 2015, identified male. E. Habitus, lateral view, arrow indicating the tarsus white; F. Hypopygium, left lateral view.

FIGURE 6. A–B. Systenus naranjensis Bickel, 2015, identified male. A. Habitus, lateral view; B. Hypopygium, left lateral view. C–D. Systenus parkeri Bickel, 2015, identified male. C. Habitus, lateral view; D. Hypopygium, left lateral view.