Original description: Test spindle-shaped, large, inflated, usually with five to six post abdominal chambers. Cephalis hemispherical, covered with layer of microgranular silica. Thorax and subsequent chambers trapezoidal in outline, gradually increasing in width, final three post-abdominal chambers gradually decreasing in width. Test wall consisting of three layers. Inner latticed layer and intermediate (second) latticed layer comprised of medium size of square torectangular pore frames (pl.19, figs. 4-5, 16, 21), outer most latticed layers consisting predominantly of triangular pore frames. Distal post-abdominal chambers often lacking outer most layer of meshwork and showing to rectangular pore frames of inner latticed layer(s) (pl.19, figs. 3, 20).

Original remarks: Canutus baumgartneri, n. sp. differs from C. blomei Pessagno and Whalen by having a less inflated test with less massive pore frames. it can be distinguished from C. tipperi Pessagno and Whalen by having a test with less massive pore frames and a less pointed cephalis.

Etymology: This species is named after Dr. P. 0. Baumgartner, in honor of his studies on the Mesozoic Radiolaria.

Canutus baumgartneri was named by Yeh (1987). Its type specimen is NMNS (000073) and is a 3D body fossil.