Calosargus (Calosargus) Mostovski, 1997

Zhang, Kuiyan, Yang, Ding & Shih, Dong Ren Chungkun, 2007, The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae), Zootaxa 1645, pp. 1-17 : 2

Subgenus Calosargus (Calosargus) Mostovski, 1997

Type species. Calosargus (Calosargus) tatianae Mostovski, 1997

Stratigraphic and geographic range. The Middle/Upper Jurassic; Kazakhstan, China.

Diagnosis. Subgenus Calosargus Mostovski, 1997 differs from subgenus Pterosargus Mostovski, 1997 in veins M1 and M2 distinctly separated at base, vein M3 absent, and cell br nearly as wide as cell bm.

Key to species of Calosargus

1. Veins M1 and M2 converged at base; vein M3 present..................................... C. (P.) thanasymus Mostovski

- Veins M1 and M2 distinctly separated at base; vein M3 absent......................................................................2

2. Vein Rs1 long, about twice as long as vein Rs2.............................................................................................3

- Vein Rs1 short, nearly as long as vein Rs2………………………….............................................................6

3. Vein R2+3 long, ending at vein R1 near wing margin…………… ............................... C. (C.) bellus sp. nov.

- Vein R2+3 short, ending at vein R1 far from wing margin…………..………................................................4

4. Cell d large; mouth of cell m1 about twice as wide as that of cell m2 ...................... C. (C.) niger Mostovski

- Cell d smaller than above; mouth of cell m1 about as wide as that of cell m2…..… ..........................…..…5

5. Vein R5 far longer than vein R4; base of cell d obtuse..…… ...........................… C. (C.) tatianae Mostovski

- Vein R5 slightly longer than vein R4; base of cell d acute……........................... … C. (C.) antiquus sp. nov.

6. A spurious crossvein between veins R1 and R2+3 present; vein Rs1 slightly longer than vein Rs2 .................. ....................................................................................................................................... C. (C.) hani sp. nov.

- Spurious crossvein between veins R1 and R2+3 absent; vein Rs1 not longer than vein Rs2............................7

7. Mouth of cell r1 narrow, about 1/4 as wide as that of cell r4 ......................... C. (C.) daohugouensis sp. nov.

- Mouth of cell r1 wide, about 1/2 as wide as that of cell r4............................................................................8

8. Cell d slender; base of cell m2 about 3.5 times as wide as that of cell m1 ...................................................... ........................ ……………………………………………………….....…. C. (C.) tenuicellulatus sp. nov.

- Cell d wide; base of cell m2 about 1.5 – 2 times as wide as that of cell m1 .............. C. (C.) validus sp. nov.