Abatus cavernosus is a species of sea urchin of the family Schizasteridae.

It is in the genus Abatus and lives in the sea.

Abatus cavernosus was first scientifically described in 1845 by Rodolfo Philippi.

[1] Females brood their young in a brood pouch through the gastrula stage until they are juveniles.

[2] This article about a sea urchin is a stub.