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Brachythoraci
Brachythoraci is an extinct suborder of arthrodire placoderms, armored fish most diverse during the Devonian.
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. (Although Holonematidae's membership in Brachythoraci is disputed.) Below is a cladogram from the 2016 Zhu et al. phylogenetic study:
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