Alveolata are a group of protists which includes the Ciliophora, Apicomplexa and Dinoflagellata.
Members of this group are of particular interest to science as the cause of serious human and livestock diseases.
The Chromista are a group of protists that contains the algal phyla Heterokontophyta (stramenopiles), Haptophyta and Cryptophyta.
Excavata is a group of related free living and symbiotic protists; it includes the Metamonada, Loukozoa, Euglenozoa and Percolozoa.
These basal opisthokonts are reasonably categorized as protists and include choanoflagellates, which are the sister or near-sister group of animals.