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| Ptychoderidae | |
|---|---|
| |
| Balanoglossus | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Hemichordata |
| Class: | Enteropneusta |
| Order: | Enteropneusta |
| Family: | Ptychoderidae |
Ptychoderidae is a family of acorn worms.
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