Azab, M. M. 1989. A new Ditremaster species (Spatangoida: Echinoidea) from the Middle Eocene of Egypt. Middle East Research Center Ain Shams University, Earth Science Series 3, 179-183.
175805
Azab, M. M.
1989
A new Ditremaster species (Spatangoida: Echinoidea) from the Middle Eocene of Egypt
Middle East Research Center Ain Shams University, Earth Science Series