Historically, the genus has generally been placed in the subfamily
Dolichopodinae. In 2005, based on a cladistic analysis of the subfamily, Scott E. Brooks excluded Pseudohercostomus from the Dolichopodinae. The systematic position of the genus is still unclear, though a possible relationship with the New World genus Keirosoma has been suggested.[2]
^Stackelberg, A. A. (1931). "Dolichopodidae der Deutschen Limnologischen Sunda-Expedition". Arch Hydrobiol Suppl Bd Tropische Binnengewasser(Suppl.). 8: 771–782.
^Grichanov, I.Y. (2023). "A New Species of Hercostomus Loew, 1857 (Diptera, Dolichopodidae) from India with Some Nomenclatural Notes". Entomological Review. 103 (6) (published 15 February 2024): 684–691.
doi:
10.1134/S001387382306009X.