Fig. 1.

Phylogeny of Epsilonproteobacteria. An example phylogenetic tree of Epsilonproteobacteria with example members from the Campylobacterales and Nautiliales orders. A Deltaproteobacteria (Desulfurella acetivorans) has been included as an example from another class. Campylobacter and Helicobacter belong to the same order, but branch into different families with different host niches. Adapted from Waite et al.²³³ and visualized with iTol.²³⁴