Assertion: brittle star's relative | /r/HasProperty | restricted to the lower cambrian
Facets:
Source sentences:
text: Other dominant Cambrian invertebrates with hard parts were trilobites (like the one pictured above), archaeocyathids (relatives of sponges that were restricted to the Lower Cambrian), and problematic conical fossils known as hyolithids (like the one pictured above, right).