Brachythoraci is an extinct suborder of arthrodire placoderms, armored fish most diverse during the Devonian.
| Brachythoraci Temporal range: | |
|---|---|
 | |
| Dunkleosteus and Titanichthys skulls in Wyoming Dinosaur Center | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Clade: | †Phlyctaenioidei |
| Suborder: | †Brachythoraci Gross, 1932 |
| Contained taxa | |
Phylogeny
Arthrodira is divided into three main groups: the paraphyletic Actinolepida and Phlyctaenii, and then the monophyletic Brachythoraci. Brachythoraci is then further divided into the large derived clade Eubrachythoraci and several basal groups: Buchanosteoidea, Homosteidae, and Holonematidae.[1] (Although Holonematidae's membership in Brachythoraci is disputed.)[2]
Below is a cladogram from the 2016 Zhu et al. phylogenetic study:[2]
| Phlyctaenioidei |
| "Phlyctaenii" | ||||||||||||||||||