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
Echinodermata	Echinoidea	Arbacioida
Echinodermata	Echinoidea	Cidaroida
Echinodermata	Echinoidea
Echinodermata	Echinoidea	Camarodonta
Echinodermata	Echinoidea	Echinoida
Echinodermata	Echinoidea	Diadematoida