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	Camarodonta	Echinometridae	Echinometra lucunter
Echinodermata	Echinoidea	Echinoida	Echinometridae	Echinometra viridis
Echinodermata	Echinoidea	Echinoida	Echinometridae	Heterocentrotus mammillatus