Pseudorhabdosynochus justinei is a species of diplectanid monogenean that is parasitic on the gills of the longfin grouper Epinephelus quoyanus.

It was described in 2007 by Binjian Zeng and Tingbao Yang from material from the South China Sea,[1] and redescribed in 2009 by Justine, Dupoux & Cribb from material from off Queensland, Australia.

[2] Pseudorhabdosynochus justinei is a small monogenean, 0.3-0.5 mm in length.

[1] The type-host of P. justinei is the longfin grouper Epinephelus quoyanus (Serranidae: Epinephelinae).

[1] The species has also been recorded from the same host fish near Heron Island, off Queensland, Australia.