Polymorphida
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| Polymorphida | |
|---|---|
 | |
| Corynosoma wegeneri | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Acanthocephala |
| Class: | Palaeacanthocephala |
| Order: | Polymorphida Petrochenko, 1956 |
Polymorphida are an order of thorny-headed worms (phylum Acanthocephala). The adults of these parasitic platyzoans feed mainly on fish and aquatic birds.
This order contains 5 families:[1][2]
- Centrorhynchidae Van Cleave, 1916
- Isthomosacanthidae Smales, 2012
- Plagiorhynchidae Meyer, 1931
- Pyriprobosicidae
- Polymorphidae Meyer, 1931
