The Echinoid Directory

Eoagassizia Grant & Hertlein, 1938, p. 115

Diagnostic Features
  • Test small, ovate in outline; without frontal sulcus.
  • Apical disc central; not preserved in only known specimen.
  • Amb III not preserved.
  • Part of Amb. IV preserved showing anterior column has much narrower pore-pairs than posterior column.
  • Posterior petals flush and bowed; relatively short.
  • Peristome nearly circular.
  • Test too worn to establish tuberculation and fasciole pattern.
Eocene, California, USA.
Name gender feminine
Eoagassizia alta A. Clark in Grant & Hertlein, 1938, p. 115, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Spatangoida, Paleopneustina, Prenasteridae.

Monotypic, nomen dubium; probably a junior synonym of Agassizia


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.