Aceste ovata
Aceste ovata is a species of sea urchin of the family Schizasteridae. Their armour is covered with spines. It came from the genus Aceste and lives in the sea. Aceste ovata was first scientifically described in 1907 by Alexander Emanuel Agassiz & Hubert Lyman Clark.

References 

Spatangoida
Animals described in 1907
Taxa named by Alexander Agassiz
Taxa named by Hubert Lyman Clark