Diplozoidae

Mazocraeidea
Heteromicrocotyloides megaspinosus (Heteromicrocotylidae)
Scientific classification
Kingdom:	Animalia
Phylum:	Platyhelminthes
Class:	Monogenea
Subclass:	Polyopisthocotylea
Order:	Mazocraeidea Price, 1936
Families
See text

See text

Mazocraeidea is an order in the subclass Polyopisthocotylea within class Monogenea.

The species of this order have various structures in the clamps of their posterior attachment organ, including additional sclerites in the Gastrocotylidae and related families. However, these additional sclerites, and even the clamps themselves, are lacking in certain members of the family Protomicrocotylidae.

...
Wikipedia