tritrabidae tritrabidae tritrabidae is a family of radiolarians in the order spumellaria. they range in age from 235 to 125 million years. tritrabidae scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: retaria subphylum: radiolaria class: polycystinea order: spumellaria family: cavaspongiidaebaumgartner, 1980 genera archaeotritrabs ditrabs neoparonaella tritrabs