the root (no rank)
Eukaryota (domain)
Alveolata (kingdom)
Ciliophora (phylum)
Spirotrichea (class)
Stichotrichida (order)
Oxytrichidae (family)
Stylonychia (genus)
[hide inferior taxa]
Stylonychia lemnae (species)
Stylonychia mytilus (species)
Stylonychia pustulata (species)