castanidium elegans castanidium elegans castanidium elegans is a species of cercozoans in the family castanellidae. it is found in the sargasso sea and in the current around the canary islands. castanidium elegans scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: cercozoa class: phaeodaria order: phaeogromia or phaeocalpida family: castanellidae genus: castanidium species: c. elegans binomial name castanidium elegansschmidt, 1908