Cryptochetum Rondani 1875
Creators: name: Xi, Yuqiang
name: Yin, Xinming
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Cryptochetidae
Cryptochetum

description: Key to species of Cryptochetum Rondani, 1875   
 1. Ocellar triangle small, separated from antennal base; costal vein (C) extending to vein M 1........... 2   
 – Ocellar triangle large, reaching antennal base; costal vein (C) extending to vein R 4+5 or slightly beyond apex of wing......................................................................................................................... 3   
 2. Wing crossvein dm-m curved inward (Fig. 22).............................. C. curvatum Yang & Yang, 1996   
 – Wing crossvein dm-m perpendicular (Fig. 23)................................ C. deltatum Yang & Yang, 1996   
 3. Wing vein R 4+5 terminating at apex of wing..................................................................................... 4   
 – Wing vein R 4+5 terminating before apex of wing, located between R 4+5 and M 1.............................. 9   
 4. Wing vein M 1 between r-m and dm-m crossveins as long as dm-m crossvein (Fig. 24)...................................................................................... C. tianmuense Yang & Yang, 2001   
 – Wing vein M 1 between r-m and dm-m crossveins longer than dm-m crossvein.............................. 5   
 5. Wing vein M 1 between r-m and dm-m crossveins 2.0 × as long as dm-m crossvein (Fig. 25).......................................................................................... C. acutulum Yang & Yang, 1996   
 – Wing vein M 1 between r-m and dm-m crossveins <2.0 × as long as dm-m crossvein.................... 6   
 6. Wing vein M 1 between r-m and dm-m crossveins 1.2 × as long as dm-m crossvein (Fig. 9)..................................................................................................... C. glochidiatusum sp. nov.   
 – Wing vein M 1 between r-m and dm-m crossveins 1.5 × as long as dm-m crossvein....................... 7   
 7. Antennal postpedicel slightly acute apically (Fig. 26).................. C. zalatilabium Xi & Yang, 2015   
– Antennal postpedicel slightly blunt apically..................................................................................... 8  
 8. Knob of haltere dark brown; distal portion of M 4 (part beyond crossvein dm-m) 2.0 × as long as dm-m crossvein (Fig. 3)......................................................................... C. euthyiproboscise sp. nov.   
 – Knob of haltere dark yellow; distal portion of wing vein M 4 (part beyond crossvein dm-m) 1.5 × as long as dm-m crossvein (Fig. 17)................................................................. C. longilingum sp. nov.   
 9. Costal wing vein (C) extending beyond end of vein R 4+5; vein M 1 between r-m and dm-m crossveins virtually as long as dm-m crossvein (Fig. 27)......................... C. kunmingense Yang & Yang, 1996   
 – Costal wing vein (C) extending to end of vein R 4+5; vein M 1 between r-m and dm-m crossveins shorter than dm-m crossvein........................................................................................................... 10   
 10. Apex of wing situated medially between veins R 4+5 and M 1...........................................................11   
 – Apex of wing closer to vein R 4+5 than to vein M 1........................................................................... 13   
 11. Wing vein M 1 between r-m and dm-m crossvein as long as vein M 4 (part beyond dm-m crossvein) (Fig. 28)................................................................................ C. fanjingshanum Yang & Yang, 1988   
 – Wing vein M 1 between r-m and dm-m crossvein shorter than vein M 4 (part beyond dm-m crossvein)........................................................................................................................................ 12   
 12. Distal portion of wing vein M 4 (part beyond dm-m crossvein) 1.7 × as long as dm-m crossvein; dm-m crossvein virtually straight (Fig. 29).................................. C. maolanum Yang & Yang, 1996   
 – Distal portion of wing vein M 4 (part beyond dm-m crossvein) 3.0 × as long as dm-m crossvein; dm-m crossvein slightly curved (Fig. 30)...................................... C. shaanxiense Xi & Yang, 2015   
13. Mid section of dm-m crossvein appreciably curved....................................................................... 14  
– Mid section of dm- m crossvein perpendicular.............................................................................. 15  
 14. Antennal postpedicel wide and flat, margin inclined apically (Fig. 31)........................................................................................................................................................ C. yunnanum Xi & Yang, 2015   
 – Antennal postpedicel slightly narrow and short, margin blunt and rounded apically (Fig. 32)............................................................................. C. nonagintaseptem Yang & Yang, 1998   
15. Ocellar triangle approximately in equilateral triangle.................................................................... 16  
– Ocellar triangle approximately in obtuse triangle.......................................................................... 17  
 16. Apex angle of ocellar triangle slightly wider than distance between antennae; body slightly smaller (body length 1.5 mm) (Fig. 33).................................................... C. medianum Yang & Yang, 1998   
 – Apex angle of ocellar triangle slightly narrower than distance between antennae; body slightly larger (body length 3.5 mm) (Fig. 34)........................................................ C. sinicum Yang & Yang, 1996   
 17. Apical angle of ocellar triangle slightly wider than distance between antennae; antennal postpedicel acute apically (Fig. 35)........................................................... C. acuticornutum Yang & Yang, 1998   
 – Apical angle of ocellar triangle nearly equal to distance between antennae; antennal postpedicel with apical margin inclined inward (Fig. 36)....................................... C. beijingense Yang & Yang, 1996
description: Published as part of Xi, Yuqiang & Yin, Xinming, 2020, Three new Cryptochetum Rondani, 1875 (Diptera: Cryptochetidae) from Yunnan Province, China and an identification key to Chinese species, pp. 1-15 in European Journal of Taxonomy 605 (605) on pages 2-3, DOI: 10.5852/ejt.2020.605, http://zenodo.org/record/3668822