The type-host of Pseudorhabdosynochus regius is the grouper mottled grouper (Mycteroperca rubra) and the species has not been found in another host.
The type-locality if off Dakar, Senegal.
The monogenean has also been found on fish of the same species caught off Sfax, Tunisia and off Tripoli, Libya.
Thus, P. regius is known from the Mediterranean Sea and the Eastern Atlantic.

Only 14 species of diplectanids parasitic on groupers are known in the Mediterranean Sea and P. regius is one of them.
The type-host of Pseudorhabdosynochus regius is the grouper mottled grouper (Mycteroperca rubra) and the species has not been found in another host. The type-locality if off Dakar, Senegal. The monogenean has also been found on fish of the same species caught off Sfax, Tunisia and off Tripoli, Libya. Thus, P. regius is known from the Mediterranean Sea and the Eastern Atlantic. 
Only 14 species of diplectanids parasitic on groupers are known in the Mediterranean Sea and P. regius is one of them.
Pseudorhabdosynochus regius