cromyatractus cromyatractus cromyatractus is a genus of radiolarians in the order spumellaria. cromyatractus illustration from report on the radiolaria collected by h.m.s. challenger during the years 1873-1876. part iii. plate 15. staurosphærida et druppulida. fig. 1. cromyatractus tetracelyphus, n. sp., ×300 fig. 2. cromyatractus tetraphractus, n. sp., ×300 fig. 3. cromyatractus cepicius, n. sp., ×300 fig. 4. cromyatractus ceparius, n. sp. (vel caryostylus ceparius), ×300 scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: retaria subphylum: radiolaria class: polycystinea order: spumellaria genus: cromyatractushaeckel, 1887 species cromyatractus ceparius cromyatractus cepicius cromyatractus elegans cromyatractus tetracelyphus cromyatractus tetraphractus (type)