You can search the complete taxonomic tree of the species in the database. Click "Phylum" to get back to to the starting point. The thumbnails show examples of the Class, Order etc.

Phylum	Class	Order	Family	Species
Chlorophyta	Bryopsidophyceae	Bryopsidales	Halimedaceae
Chlorophyta	Ulvophyceae	Bryopsidales	Halimedaceae
Chlorophyta	Bryopsidophyceae	Bryopsidales	Udoteaceae
Chlorophyta	Ulvophyceae	Bryopsidales	Udoteaceae