Eoacanthocephala

Eoacanthocephala is a class of parasitic worms, within the phylum Acanthocephala. They feed on any aquatic cold-blooded creature such as turtles and fish. Their proboscis spines are arranged radially, with no protonephridia, and with persistent ligament sacs in female. The only reliable way to identify the group is that they only have one cement gland. This is a primitive characteristic and hence the name. The class contains 2 orders:

Quadrigyridae is the only family within Gyracanthocephala, an order of parasitic worms of class Eoacanthocephala. This family contains two subfamilies, ten genera and about 92 species.

Neoechinorhynchida is an order of parasitic worms from the phylum Acanthocephala. It contains 3 families:

Acanthogyrus is a genus of parasitic worms belonging to the family Quadrigyridae. The species of this genus are found in Africa.

Quadrigyrus is a genus in Acanthocephala (thorny-headed worms, also known as spiny-headed worms).