Calveriosoma hystrix is a species of sea urchin of the family Echinothuriidae.

Calveriosoma hystrix was first scientifically described in 1872 by Thomson.

[1] C. hystrix has a structure known as a siphon, which is a thin tube that runs parallel to the stomach.

While its function is not certain, it likely serves a way of moving water from the esophagus to the beginning of the intestine.

This article about a sea urchin is a stub.