cornutella (radiolarian) cornutella (radiolarian) cornutella is a genus of radiolarians in the family theoperidae. c. clathrata, the type species, was described from the miocene of caltanisetta, sicily. cornutella illustration from report on the radiolaria collected by h.m.s. challenger during the years 1873-1876. part iii. plate 54. phænocalpida, cyrtocalpida, anthocyrtida et sethocyrtida. fig. 9. cornutella hexagona, n. sp., × 400 scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: retaria subphylum: radiolaria class: polycystina order: nassellaria family: theoperidae genus: cornutellaehrenberg, 1838 species †cornutella clathrata ehrenberg (type) cornutella hexagona cornutella profunda ehrenberg, 1856