Pseudorhabdosynochus monaensis is a diplectanid monogenean parasitic on the gills of the rock hind, Epinephelus adscensionis.

Kritsky, Bakenhaster & Adams (2015) wrote that P. monaensis is easily distinguished from other species of Pseudorhabdosynochus of the western Atlantic Ocean by its unique vaginal sclerite.

Other features defining the species include the elongate ventral bar with a minimal medial constriction and a male copulatory organ having a comparatively long cone.

[2] The type-host and only recorded host of P. monaensis is the rock hind, Epinephelus adscensionis (Serranidae: Epinephelinae).

The type-locality and only locality is Rock ridges off Playa Sardinera, Mona Island, Puerto Rico.