Assertion: arthropod's feature | /r/CapableOf | suggest this suborder
Facets:
value: to be the ancestral trilobite stock
type: OTHER
Source sentences:
text: Another common feature of the Olenellina also suggests this suborder to be the ancestral trilobite stock: early protaspid stages have not been found, supposedly because these were not calcified, and this also is supposed to represent the original state.