The basic body plan of trilobozoans is often a triradial or radial sphere-shaped form with lobes radiating from its centre.

[citation needed] Most of the members of what is now the modern day classification for Trilobozoa were thought to have originally been free swimming Jellyfish.

[1] The eventual split of Coelenterata into the phyla Cnidaria and Ctenophora led the Trilobozoa to obtain a phylum level of affinities.

[5] The members of the Trilobozoa are now thought to be sessile, benthic organisms of unknown affinities, and are a subject open for interpretations and debate.

Trilobozoans had a triradial shield-like body that had three antimeres which consisted of a cluster of grooves on their outer surface and within their inner cavity.

The spiral-like orientation of the internal bodies of trilobozoans suggests that they were modified from an originally longitudinal to the axis which resulted in the deposition of the organs.

The lobes taper at both their proximal and distal ends, which divide the organism into a number of narrow bodies that are divisible by three.

[2] Hallidaya brueri constitutes as a discoidal form that is restricted to Mount Skinner of the Northern Territory of Australia.

Specimens commonly show three central depressions connected by a much smaller, pouch-shaped one around the perimeter of the disk by multiple canals radiating from its centre.