cornutanna cornutanna cornutanna is a genus of radiolarians in the order nassellaria. cornutanna scientific classification (unranked): sar (unranked): rhizaria phylum: retaria subphylum: radiolaria class: polycystinea order: nassellaria genus: cornutannahaeckel, 1881 species †cornutanna elegans principi, 1909 - miocene of reggio emilia, italy cornutanna orthoconus haeckel, 1887