Assertion: keyhole sand dollar | /r/HasAspect | symbiotic relationship
Facets:
value: with a tiny crab
type: OTHER
Source sentences:
text: The Keyhole Sand Dollar, also known as the Keyhole Urchin, has a symbiotic relationship with a tiny crab, Dissodactylus mellitae or Sand Dollar crab, which often lives in pairs near the openings in this sand dollar’s shell.