Pseudorhabdosynochus maternus is a diplectanid monogenean parasitic on the gills of the Malabar grouper, Epinephelus malabaricus.

[1] Pseudorhabdosynochus maternus is a small monogenean, 0.6 mm in length.

The species are P. maaensis, P. malabaricus, P. manifestus, P. manipulus, P. marcellus, and P. maternus.

The type-host and only recorded host of P. maternus is the Malabar grouper, Epinephelus malabaricus (Serranidae: Epinephelinae).

The type-locality and only recorded locality is the Barrier Reef off Nouméa, New Caledonia[1] where it was considered a rare species.