Priapichthys annectens is a species of freshwater fish.

It is the type species of the genus Priapichthys (though first described as Gambusia annectens).

It is native to Costa Rica, primarily inhabiting brooks and streams with currents of low to high velocity.

A carnivorous surface feeder, it occurs in shoals near the shoreline.

This species has the terminal, upward-facing mouth typical of surface feeders, and a protruding belly.