Originally, Trilobozoa was established as a class in the phylum Coelenterata, but since Coelenterata has been divided into two separate phyla, Cnidaria and Ctenophora, Trilobozoa itself has been promoted to the rank of phylum.
Initially, Trilobozoa was designated as a class within the phylum Coelenterata. However, with Coelenterata being reorganized into two distinct phyla, Cnidaria and Ctenophora, Trilobozoa has been upgraded to its current status as a phylum.