Microdontinae

Cheng, Xin-Yue & Thompson, Christian, 2008, A generic conspectus of the Microdontinae (Diptera: Syrphidae) with the description of two new genera from Africa and China, Zootaxa 1879, pp. 21-48: 23-24

publication ID

http://doi.org/ 10.5281/zenodo.184168

publication LSID

lsid:zoobank.org:pub:4A0F2908-8B16-4B08-8ECF-EE4BDD487E52

persistent identifier

http://treatment.plazi.org/id/2C322911-4C5B-7757-A9BE-E1E9FA07BFB9

treatment provided by

Plazi

scientific name

Microdontinae
status

 

Key to the groups of the subfamily Microdontinae  

1. Postmetacoxal bridge incomplete; metathoracic anepimera not fused; proanepisternum enlarged, usually with vertical row of long strong pile; occiput with distinct crease on dorsal third (figs 34–35). Vein R 4 + 5 without an appendix (fig. 32) (Tribe Spheginobacchini   )............................................................................ 41

- Postmetacoxal bridge complete; metathoracic anepimera fused medially to form bridge; proanepisternum not greatly enlarged and not with row of long strong pile; occiput without creases (tribe Microdontini   )... 2

2. Vein R 4 + 5 with an appendix extending posteriorly into cell R 4 + 5 (figs 28, 44, 48–49).......................... 15

- Vein R 4 + 5 without such an appendix (figs 1, 5, 10, 24, 32–33).................................................................. 3

3. Either vein M 1 processive, directed outwardly and cell R 4 + 5 with acute apex (fig. 33); or face with a distinct tubercle under antennae; metasternum underdeveloped, bare (fig. 40) (Neotropical) ........................ 12

- Never with vein M 1 processive, either straight or slightly recurrent; face without a tubercle under antenna ....................................................................................................................................................................................... 4

4. Abdomen petiolate; vein M with a short appendix extending anteriorly into cell R 4 + 5 (as in fig, 32); metasternum under developed, reduced to thin line, bare (fig. 40) (New World) ....................... Mixogaster  

- Abdomen not petiolate, oval to elongate; vein M without such an appendix............................................... 5

5. Scape very short, only as long as broad; antenna inserted dorsally on head, at or above dorsal margin of eye (fig. 46); mouthparts absent; male basoflagellomere with multiple furcations (fig. 47) (southern South America) ....................................................................................................................................... Masarygus  

- Scape long, much longer than broad (figs 3, 12, 38 –39, 43); antenna usually inserted medially, much ven-

tral to dorsal margin of eye; mouthparts present; male basoflagellomere usually normal, not multiply fur- cate, at most with only two branches............................................................................................................ 6 6. Postpronotum bare; thorax and abdomen with long thick black bristle-like pile; katatergum bare and smooth on dorsoanterior 1 / 2 ............................................................................................................ Surimyia  

- Postpronotum pilose; thorax and abdomen without such black bristle-like pile; katatergum microtrichose and rugose..................................................................................................................................................... 7

7. Anepimeron bare or with a few long pili on dorsal edge; antenna short, only about 2 as long as face (fig. 36); abdomen oval (Neotropical) .................................................................................................. Paragodon  

- Anepimeron generally pilose; antenna usually long, usually longer than 2 as long as face; if shorter, then abdomen elongate......................................................................................................................................... 8

8. Abdomen oval............................................................................................................................................. 13

- Abdomen narrow, parallel-sided or triangular (figs 19, 16–17, 24) ............................................................. 9

9. Occiput uniform, as wide dorsally as ventrally (fig. 39); metatibia narrow, with long pile; abdomen elon- gate; small, pale orange to yellow flies (fig. 24) (Neotropical) ........................................................... Rhoga  

- Occiput broad dorsally, narrow ventrally (figs 13, 38); metatibia usually without long pile, if with long pile, then pile thick and abdomen triangular (fig. 17)................................................................................ 10

10. Metatibia broad medially, with row of long pile along dorsal edge (figs 11, 20)....................................... 38

- Metatibia narrow, without distinct brush of long pile (fig. 42)................................................................... 11

11.Transverse suture incomplete medially; anepisternum pilose only on anterodorsal corner and narrowly along posterior edge; metasternum usually pilose (Neotropical, Oriental) ............................ Paramicrodon  

- Transverse suture distinct, continuous across scutum; anepisternum uniformly pilose, without bare medi- ally area; metasternum bare (Oriental) ............................................................................................. Indascia  

12. Face with a dorsomedial tubercle under antenna; profemur with a distinct spinose pad on basal 1 / 4 or more ................................................................................................................................... Eurypterosyrphus  

- Face straight or convex, without such a tubercle; profemur without spinose pad .................. Aristosyrphus  

13. Basoflagellomere not furcate, at most twice as long as scape (fig. 1) (Afrotropical) ........... Afromicrodon  

- Male basoflagellomere furcate; female basoflagellomere greatly elongate, 3 or more times as long as scape (Neotropical, Oriental)...................................................................................................................... 14

14. Metasternum developed, pilose; katepisternum pilose; scutellum medially excavated (fig.) (Oriental China) ........................................................................................................................................ Furcantenna  

- Metasternum reduced, bare; katepisternum bare; scutellum convex apically (Neotropical).......................... ........................................................................................................................................... Schizoceratomyia  

15. Abdomen oval or parallel-sided.................................................................................................................. 22

- Abdomen petiolate; 2 nd segment flattened, sometimes constricted or with large basolateral pale macula; 3 rd and 4 th (males) or 5 th (females) forming a club.................................................................................. 16

16. Basoflagellomere 3 to 5 times as long scape (fig 43) (Oriental, Australian) ....................... Paramixogaster  

- Basoflagellomere never more than twice as long as scape (fig. 30)........................................................... 17

17. Katepimeron pilose (Southern Nearctic, Neotropical) ......................................................... Rhopalosyrphus  

- Katepimeron bare........................................................................................................................................ 18

18. 2 nd abdominal segment cylindrical, longer than thorax (fig. 18); thoracic pile very short and strongly appressed; postpronotum, anterior anepisternum and metasternum appearing bare even under high magni- fication (Neotropical) Ceriomicrodon  

- 2 nd segment shorter than thorax; thoracic pile longer, erect; postpronotum, anterior anepisternum and metasternum usually with long distinct pile............................................................................................... 19

19. Metasternum bare....................................................................................................................................... 21

- Metasternum pilose..................................................................................................................................... 20

20. Vertex swollen, shiny, bare at least anteriorly. Gena reduced, narrow, usually not visible in lateral view

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Syrphidae