the root (no rank)
Eukaryota (domain)
Metazoa (kingdom)
Cnidaria (phylum)
Hydrozoa (class)
Hydroida (order)
Anthomedusae (suborder)
Hydridae (family)
Hydra (genus)
Hydra viridis (species)
Chlorohydra viridissima (alias)
[hide inferior taxa]