Protichnites - Evidence of the earliest land predators

Was the Protichnites track maker a horseshoe crab?

The horseshoe crab, still extant, and often considered the closest relative of the trilobites, meets the morphological criteria as a Protichnites trackmaker. It is a multi-legged arthropod with a prominent telson. However, no horseshow crab exoskeletons have been found in the Krukowski quarry, leading to the question, was it a softbodied reletive of them.