Grant & Hertlein established this genus on the basis of a single badly worn specimen. They thought it close to Agassizia, but differing in having pore-pairs in the anterior column of the anterior petals only slightly reduced in size. The pores in the anterior column appear somewhat enlarged by weathering and there is no significant enlargement of pore-pairs towards the base. Anisaster differs only in having developed pore-pairs in the distal half of the anterior column of the anterior ambulacrum.
Grant, U.S. & Hertlein, L.G. 1938. The west American Cenozoic Echinoidea. Publications of the University of California at Los Angeles in Mathematical and Physical Sciences 2, 1-225.