The parasitic worm Heteracanthocephalidae belongs to the Kingdom: Animalia, Phylum: Acanthocephala, Class: Palaeacanthocephala, and Order: Echinorhynchida (which also includes other parasitic worms like Cavisomidae and Illiosentidae).
Heteracanthocephalidae is a family of parasitic worms from the order Echinorhynchida. Kingdom: Animalia Phylum: Acanthocephala Class: Palaeacanthocephala Order: Echinorhynchida Cavisomidae Meyer, 1932 Illiosentidae Golvan, 1960 
