Fig. 3: Distribution and evolution of motility within the class Dehalococcoidia.

a Cladogram inferred from the Dehalococcoidia phylogenomic tree serving as evolutionary hypothesis for ancestral character state reconstruction. Orders from diverse environments are shaded in gray, while the Tepidiformales are shaded in red and indicated with red branches, and the Marine Radiation is shaded in blue, with SAR202 lineages indicated with blue branches and asterisks and blue text in the key. The presence of a core structural flagellar gene set (Group 1 genes) in genomes belonging to the class is indicated with gradations of teal in the inner track, while the presence of regulatory genes (Group 2 genes) is indicated in gradations of green in the middle track. Other motility genes that are intermittently found within the class are indicated in gray in the outer track. Predicted consensus gains (dots outlined with green) or losses (dots outlined with red) of the full or partial core structural set are indicated at nodes where predictions for individual genes agree. b Schematic of conserved flagellar genes found in the genomes of the Dehalococcoidia. Conserved structural and regulatory proteins are indicated based on their relative positions on the flagellum schematic while those components found intermittently are indicated in gray, and components being absent from the genomes are indicated in light yellow, specifically FlgH and FlgI, forming the L- and P-rings.