Pambdelurion was large for a Cambrian
animal, and is estimated to have reached a length of .
Omnidens, an organism from China that closely resembles
Pambdelurion and may even be synonymous with it, reached even larger sizes, estimated to be based on the proportions of
Pambdelurion. The head of
Pambdelurion bore a large pair of frontal appendages, homologous to the antennae of onychophorans and frontal appendages of
radiodonts. These frontal appendages were weakly muscled and relatively soft, suggesting they may have served primarily as sensory organs, rather than for grasping prey. Between the appendages are a pair of clusters of three spines, which probably served a sensory function. Eyes had not been identified before, but some pointed that it would have had eyes similar to
Kerygmachela. On the ventral surface of the head was the mouth, which was an oral cone similar to that of other non-arthropod ecdysozoans. The body possessed eleven pairs of non-muscular, gill-bearing lateral flaps and eleven pairs of lobopodous legs ventral to the flaps. The body musculature was more similar to that of onychophorans than that of arthropods. The cuticle was unsclerotized. The anterior portion of the gut was a large, muscular pharynx, as in many other ecdysozoans. More posteriorly, the gut contained paired glands. ==Paleobiology==