the root (no rank)
Eukaryota (domain)
Metazoa (kingdom)
Annelida (phylum)
Hirudinea (class)
Rhynchobdelliformes (order)
Glossiphoniidae (family)
Theromyzon (genus)
[hide inferior taxa]
Theromyzon rude (species)
Theromyzon tessulatum (species)