Cnidarian phylogeny showing the evolutionary history of P.utriculus' closest relative (P. physalis). The genome of P.utriculus has not yet been sequenced. The diagram shows a maximum likelihood (ML) phylogram based on mitochondrial DNA.

Source:

https://www.researchgate.net/figure/ML-phylogeny-of-the-Cnidaria-based-on-sequences-from-complete-mitochondrial-genomes_fig4_332419188