Systoechus (Evenhuis & Greathead, 2015)
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publication ID |
https://doi.org/10.5281/zenodo.15883406 |
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DOI |
https://doi.org/10.5281/zenodo.15996342 |
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persistent identifier |
https://treatment.plazi.org/id/B36E6E7A-FFEE-FFA1-FF44-50CED9C2FA73 |
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treatment provided by |
Felipe |
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scientific name |
Systoechus |
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An updated key to the European species of Systoechus View in CoL .This provisional key is based on the keys and species descriptions in Engel (1937), Zaitzev (2004) and Andréu Rubio (1959).
1a. Anterior basal wing cell longer than the posterior basal cell; crossvein r-m thus closer to the center of the anterior margin of the discal cell. ........................................................................................................ 2
1b. Crossvein r-m situated at the proximal third of the discal cell. ................................................................. 3
2a. Only yellow setulae on the head and abdomen. Epistome prominent, protruding further than the first two antennal segments. Mesonotum dorsally with black longitudinal stripes. [no specimens examined] …. ............................................................................................................... S. gomezmenori Andréu Rubio, 1959
2b. Not as above. …............................................................................................................. Bombylius spp.
3a. Head densely covered by long pale yellow setulae from frons to the mouth margin. Setulae on the head ± equally long on all sides, giving it a furry rounded appearance. …........... Anastoechus spp.
3b. Frons and mouth margin clearly visible under the setulae. Peristomal setulae clearly shorter than the facial setuae. …................................................................................................................................ 4
4a. Long black marginal setae on the tergites. ...................................… S. ctenopterus (Mikan, 1796)
4b. No black marginal setae on the tergites. …............................................................................................... 5
5a. Alar section of the costa with pale hairs and pale, whitish to yellowish brown setae. …..................... 6
5b. Alar section of the costa with pale hairs and black setae. …..................................................................... 7
6a. Ground color of the body grey, posterior part of the scutellum reddish. Legs entirely orange in females, basal third of the femorae darkened in males. Generally, a larger species, body length 6.0- 10.5 mm. ….... .............................................................................................................................. S. autumnalis (Pallas, 1818)
6b. Ground color of the body grey-brown, including the scutellum. Legs orange in both sexes. Wing base opaque yellow. Generally, a pale yellow small species, body length 5.0-6.0 mm [no specimens examined] …................................................................................................................................... S. pumilio Becker, 1915
7a. Frons in males shiny black with thin yellowish microtomentum ( Figure 1C View FIGURE 1 ). Female frons with two shiny calluses ( Figure 1D View FIGURE 1 ). Frons dominated by black hairs. …................................ S. laevifrons (Loew, 1855)
7b. Male frons matt ( Figure 1E View FIGURE 1 ), female frons without calluses ( Figure 1F View FIGURE 1 ). Frons dominated by pale hairs ...... 8
8a. Proboscis almost 0.75 × of the body length ( Figure 3A View FIGURE 3 ). Scutellum reddish brown in ground color, paler than rest of the thorax. Legs yellow, except for the dark tarsi. .................. S. longirostris Becker, 1916
8b. Proboscis shorter ( Figure 3B View FIGURE 3 ). No color difference between the scutellum and rest of the thorax. At least the femorae darkened .................................................................................................................................... 9
9a. Males. Eyes narrowly separated ( Figure 1E View FIGURE 1 ) ….................................................................................... 10
9b. Females. Eyes broadly separated ( Figure 1F View FIGURE 1 ) ...................................................................................... 11
10a. Face and scape (basal antenna segment) with mixed black and yellow setulae. Femora darkened brown. …........................................................................................................ S. gradatus (Wiedeman in Meigen, 1820)
10b. Face with yellow setulae surrounded by black genal hairs. Scape extensively covered with black setulae. Femora black with reddish brown apex. [no specimens examined ....... S. microcephalus (Loew, 1855)
11a. Femora darkened brown. …........................................................ S. gradatus (Wiedeman in Meigen, 1820)
11b. Femora black with reddish brown apex. [Description in Engel (1937) is insufficient and measures for antenna dimensions and frons width are probably misleading. No specimens examined.] ........................... ......................................................................................................................... S. microcephalus (Loew, 1855)
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