Pseudorhabdosynochus vascellum is a diplectanid monogenean parasitic on the gills of the scamp, Mycteroperca phenax.

[1] Kritsky, Bakenhaster & Adams (2015) wrote that Pseudorhabdosynochus vascellum belongs to the group of species of Pseudorhabdosynochus parasitizing groupers assigned to Mycteroperca and characterized by having a distally reflexed tube and a single chamber in the vaginal sclerite.

Except for P. hyphessometochus, P. vascellum is easily distinguished from these species by its small thick-walled chamber of the vaginal sclerite having a meager cavity.

Pseudorhabdosynochus vascellum is probably closest morphologically to P. contubernalis by possessing a delicate, almost nonexistent cone of the male copulatory organ.

[1] The type-host and only recorded host of Pseudorhabdosynochus vascellum is the scamp, Mycteroperca phenax (Serranidae: Epinephelinae).