the root (no rank)
Eukaryota (domain)
stramenopiles (kingdom)
Phaeophyceae (phylum)
Ectocarpales (order)
Ectocarpaceae (family)
[hide inferior taxa]
Ectocarpus siliculosus (species)
Ectocarpus variabilis (species)
Pylaiella littoralis (species)