Abstract
The family Archisargidae is an endemic Jurassic group. So far, 23 described species in 8 genera have been found in Kazakhstan, China and Mongolia. Calosargus Mostovski, 1997 is a small genus with 2 subgenera and 3 species from the Middle/Upper Jurassic of Kazakhstan. In this paper, 6 new species from the Middle Jurassic of China that belong to Calosargus (Calosargus) are described. They are the oldest known members in this genus. A key to the species of the genus Calosargus is given.References
Mostovski, M.B. (1997) To the knowledge of fossil dipterans of superfamily Archisargoidea (Diptera, Brachycera). Paleontologicheskii Zhurnal, 1, 72–77.
Nagatomi, A. & Yang, D. (1998) A review of extinct Mesozoic genera and families of Brachycera (Insecta, Diptera, Orthorrhapha). The Entomologist’s Monthly Magazine, 134, 95–192.