[1] The flattened, ovoid body compose of 11 tergites (dorsal exoskeleton), all but the posteriormost are laterally expanded and covered the appendages underneath each of them.

[1] Contray to the widely-referred reconstruction by Stürmer & Bergström (1978),[1] but as most of the Cheloniellids, There is no evidence of telson (a medial tail-like terminal structure) in any described fossil materials.

[1] Cheloniellon may have been a benthic predator,[3] using its gnathobases to crush prey while the spiny labrum may have helped lead food items toward the mouth opening.

[1] The specialized second appendages are too fragile to be raptorial, instead they may have played a tactile role, sensing the property and position of food items.

It was previously thought to be chelicerate-related,[1][2] but later studies repeatedly suggests it as a member of Artiopoda, forming the clade Vicissicaudata with Aglaspidida and related genera.