A speculative reconstruction of the head and neck of Polacanthus with cutaneous spikes drawn in 2015.
If cutaneous spikes were widespread in ornithischians, it'd make any ankylosaurs sporting them look even more dramatic. I suspect they were more so than we often depict them (see Spicomellus). Speculative doodle of the head and neck of Polacanthus from a 2015 sketchbook. #ankylosaurs #SciArt