A diverse and abundant group of single-celled marine organisms, Rhizaria are known to affect carbon and other chemical cycles of the world’s oceans, but specifics are lacking. Research has been hampered by difficulties sampling, culturing and preserving many types of this protist super-group, and they have been underrepresented in models of global geochemical cycling as a result. Researchers and partners from two U.S. universities are seeking to change that narrative through a new three-year National Science Foundation-funded study.