Pionosyllis serratisetosa is a polychaete from the family Syllidae. The body of the worm exists as a head, a cylindrical, segmented body ending in a tail. The head consists of a prostomium and peristomium and a pair of appendages (palp, antennae and cirri).
Pionosyllis serratisetosa was first described by Lòpez, San MartÃÂn & Jiménez.