Assertion: known arachnid | /r/HasAspect | segmented abdomen
Facets:
Source sentences:
text: The oldest known exclusively terrestrial arachnid is the trigonotarbid Palaeotarbus jerami, from about in the Silurian period, and had a triangular cephalothorax and segmented abdomen, as well as eight legs and a pair of pedipalps.