Prosyntexis is an extinct genus of stem sawflies in the family Sepulcidae.

There are at least four described species in Prosyntexis.

[1][2][3] The species Prosyntexis okhotensis and Prosyntexis gobiensis were formerly included in the genus Trematothorax.

[2] These four species belong to the genus Prosyntexis:

This Cretaceous insect-related article is a stub.