Cheilosia Meigen, 1822

Khaganinia, S. & Kazerani, F., 2014, A Review Of The Genus Cheilosia (Diptera, Syrphidae) From Iran, Vestnik Zoologii 48 (5), pp. 401-410 : 402-403

Genus Cheilosia Meigen, 1822

T y p e s p e c i e s: Eristalis scutellatus Fallén, 1817 .

D i a g n o s i s.The genus Cheilosia differs from other Eristalinae genera by the following combination of characters: eye with rim along the facial border; face in both sexes with well-defined facial knob and mouth edge, arista dorsal and hair-like; wing with vein R 4+5 straight, crossvein r-m before middle of discal cell; blackish species, abdomen oval, parallelsided, rarely with grayish spots.

Key to the Iranian species of the genus Cheilosia

1. Eye bare or with small and sparse hairs. ............................................................................................................... 2

— Eyes haired. ............................................................................................................................................................... 8

2. Legs black, at most tibia pale basally; sternites 2–5 shiny, often in contrast to a dull sternite 1; genitalia as in fig. 2 , f. ................................................................................................................................................... C. nigripes

— Legs partly pale at least tibia pale at the both ends. ............................................................................................. 3

3. Arista bare or shorthaired, hairs shorter than basal diameter of arista. ........................................................... 4

— Arista with hairs longer than the diameter of thickend basal part of arista. ................................................... 6

4. Hind margin of scutellum without bristle. ........................................................................................ C. laticornis

— Hind margin of scutellum with bristle. ................................................................................................................. 5

5. Third antennal segment more than 3 times as long as second segment ( fig. 1 , h). ................................. C. lola

— Third antennal segment less than 3 times as long as second segment ( fig. 1 , f). ......................... C. cumanica

6. Facial knob slender, in male nearly triangular, in female only occupying 1/3 of the face viewed from above ( fig. 1 , b). ................................................................................................................................................. C. mutabilis

— Facial knob broad from above semicircular. ........................................................................................................ 7

7. Third antennal segment bright red ( fig. 3 , b); anterior anepisternum with hairs along posterodorsal rim; thoracic dorsum with coarse punctuation; genitalia as in ( fig. 3 , c). ................................................. C. rufipes

— Third antennal segment brownish-black ( fig. 3 , g), anterior anepisternum bare along posterodorsal rim; thoracic dorsum with fine punctuation; genitalia as in ( fig. 3 , h). ................................................. C. scutellata

8. Face with distinct hairs on sides of facial knob. ................................................................................................... 9

— Face without distinct hairs on sides of facial knob, at most with very short hairs........................................12

9. Legs black. ............................................................................................................................................................... 10

— Legs partly pale, at least tibia pale at both ends. ................................................................................................ 11

10. Eye with long hairs; arista with hairs shorter than diameter of basal thickened part; genitalia as in ( fig. 4 , c). ........................................................................................................................................ C. transcaucasica

— Eye with short hairs; arista with hairs longer than diameter of basal thickened part; genitalia as in ( fig. 4 , f). .................................................................................................................................................. C. variabilis

11. Arista shorter than 3 times as long as third segment; sternites shiny; thoracic dorsum covered with 2 different length of hairs, short brown and many somewhat long black hairs; margin of tergites uniformly covered with white and long hairs. .................................................................................................... C. melanopa

— Arista shorter than 3 times as long as third segment ( fig. 4 , h); sternites dusty; thoracic dorsum covered with equal hairs; tergites with long, white hairs only on front corners of tergites. ........................ C. vulpina

12. Sternites dusty, female with elongate areas covered with longer hairs on tergites. ...................................... 13

— Sternites shiny, female without areas with longer hairs on tergites; claws on tarsi pale orange basally and black on apical 1/2 ( fig. 3 , d– f). ................................................................................................................ C. ruralis

13. Thoracic and scutellar dorsum with 2 different groups of hairs in length, longer black hairs and shorter pale to dark spots. ................................................................................................................................................. C. aerea

— Thoracic and scutellar dorsum with equal hairs, only some hairs of thoracic dorsum before the scutellum longer. .................................................................................................................................................... C. gigantean

Figures

Fig. 2. Cheilosia mutabilis (a–c): a — dorsal view of male, b — frontal view of head of female, c — male genitalia; C. nigrips, male (d–f): d — dorsal view, e — lateral view of head; f — genitalia.

Fig. 1. Cheilosia aerea (a–c): a — dorsal view of female, b — lateral view of head of female, c — male genitalia; C. cumanica (d–f): d — dorsal view of female, e — frontal view of head of female, f — male genitalia; C. lola, female (g–h): g — dorsal view, h — frontal view of head. Рис. 1. Cheilosia aerea (a–c): a — самка, вид сверху; b — голова самки, латеральный вид, c — гениталии самца; C. cumanica (d–f): d — самка, вид сверху, e — голова самки, фронтальный вид, f — гениталии самца; C. lola, самка (g–h): g — вид сверху, h — голова, фронтальный вид.

Fig. 3. Cheilosia rufipes (a–c): a — dorsal view of female, b — frontal view of head of female, c — male genitalia; C. aruralis, female (d–f): d — dorsal view, e — frontal view of head, f — lateral view; Cheilosia scutellata male (g–i): g — lateral view, h — frontal view of head, i — genitalia.

Fig.4. Cheilosia transcaucasia, male (a–c): a — dorsal view, b — frontal view of head, c — genitalia; C. variabili, male (d–f): d — lateral view, e — frontal view of head, f — genitalia; C. vulpina, male (g–i): g — lateral view, h — lateral view of head, i — genitalia. Рис. 4. Cheilosia transcaucasia, самец (a–c): a — вид сверху, b — голова, фронтальный вид, c — гениталии; C. variabilis, самец (d–f): d — латеральный вид, e — голова, фронтальный вид, f — гениталии; C. vulpine, самец (g–i): g — латеральный вид, h — голова, латеральный вид, i — гениталии.