Pseudorhabdosynochus amplidiscatus

Pseudorhabdosynochus amplidiscatus is a small monogenean. The species has the general characteristics of other species of Pseudorhabdosynochus, with a flat body and a posterior haptor, which is the organ by which the monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or "quadriloculate organ", has the shape of a bean with four internal chambers, as in other species of Pseudorhabdosynochus.^[2] The vagina includes a sclerotized part, which is a complex structure.

The species was redescribed by Oliver in 1987^[3] and by Yang, Gibson and Zeng in 2005.^[4]

The spotted sand bass (Paralabrax maculatofasciatus) is the type-host of Pseudorhabdosynochus amplidiscatus.^[1] The species has been described from fish caught off the Pacific coast of Mexico. It has also been recorded from the groupers Epinephelus labriformis and Epinephelus analogus from the Pacific coast of Mexico and Panama.^[5]