Sessilida
| Sessilida | |
|---|---|
| Zoothamnium niveum | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Clade: | Diaphoretickes | 
| Clade: | Sar | 
| Clade: | Alveolata | 
| Phylum: | Ciliophora | 
| Class: | Oligohymenophorea | 
| Subclass: | Peritrichia | 
| Order: | Sessilida Stein, 1833 | 
| Families | |
| 
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Sessilida is the largest order of the peritrich ciliates.