The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae) Author Zhang, Kuiyan Author Yang, Ding Author Shih, Dong Ren Chungkun text Zootaxa 2007 1645 1 17 journal article 10.5281/zenodo.179727 de333d52-b2e2-47cb-b3de-5c313a86ad12 1175-5326 179727 Genus Calosargus Mostovski, 1997 Type species. Calosargus ( Calosargus ) tatianae Mostovski, 1997 . Diagnosis. Head round, antennal flagellum bristle-like (if preserved). Wing slender; vein Sc ending far beyond middle of wing; vein R1 long; vein R2+3 ending at vein R1 before wing margin, vein R5 ending at (or beyond) wing apex; vein CuA1 arising from cell d; vein CuP present, vein CuA2 short; cell sc and cell r4 wide open, cell r4 short, cell d large, and cell cup narrowly open ( Mostovski 1997 , Nagatomi & Yang 1998 ).