Assertion: eurypterid's pair | /r/HasProperty | outer joint
Facets:
Source sentences:
text: long 1 Cephalothorax short 2 Cephalothorax with six (6) pairs of appendages; the anterior pair chelate antennae, and the posterior pair, long, strong swimming legs 2 Cephalothorax with five (5) pairs of appendages; the anterior simple antennae, the third pair multichelate, and the posterior pair short, the outer joint serving as a branchial organ 3 Epistoma present in Pterygotus where it is narrow.