Assertion: sea urchin's shell | /r/CapableOf | call test
Facets:
Source sentences:
text: The Spineless Sea Urchin has a hard, spherical (ball-shaped) shell, called a test, with no backbone and no spines sticking out of its body (like the Spiny Sea Urchin).
text: Echinoids have a hard calcareous shell made up of a skeleton of tightly packed or fused plates called a test.