Allogastrocotyle is a genus within the phylum Platyhelminthes and class Monogenea.

The only species in this genus (Allogastrocotyle bivaginalis) is parasitic upon fish.

[1][2][3] Allogastrocotyle was established to accommodate Allogastrocotyle bivaginalis from the gills of the rough scad Trachurus lathami, and designated as the type species of the genus.

[1] This genus resembles Gastrocotyle and Pseudaxine especially in having a haptor developed on one side of the body.

However, it differs by the following features: Allogastrocotyle includes one species: