Westralichthys
Westralichthys is an extinct monospecific genus of dunkleosteoid from the Late Devonian: Middle Famennian stage from Western Australia. It is estimated to be  long. Phylogeny
Westralichthys belongs to the superfamily Dunkleosteoidea, related to the giant Dunkleosteus. The phylogeny of Westralichthys can be shown in the cladogram below:

References

Arthrodires