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
Mollusca	Gastropoda	Littorinimorpha	Cypraeidae
Mollusca	Gastropoda	Littorinimorpha	Ovulidae
Mollusca	Gastropoda	Littorinimorpha	Ranellidae
Mollusca	Gastropoda	Littorinimorpha	Strombidae