Spider-egg-sac
Guides
Pseudogaurax
Pseudogaurax is a genus of small flies in the family Chloropidae (frit flies), established by Malloch in 1915. The genus contains approximately 70 described species distributed across all biogeographic regions, with particular diversity in the Neotropics. Larvae are specialized predators and parasitoids of arthropod eggs, with well-documented associations with spider egg sacs, dobsonfly egg masses, mantid oothecae, and—uniquely among Chloropidae—ants. The genus includes the first known ant-parasitizing species in its family, Pseudogaurax paratolmos, discovered in Panama in 2016.