Parent taxon: Arthrodiriformes according to J. S. Nelson et al. 2016
Sister taxa: Acanthaspida, Actinolepina, Africanaspis, Antarctolepis, Arctolepidae, Arctonema, Arenipiscis, Aspidichthys, Atlantidosteus, Brachydeirina, Brachythoraci, Bruntonichthys, Bullerichthys, Bungartiidae, Burrinjucosteus, Callognathus, Camuropiscidae, Coccosteina, Copanognathus, Cosmacanthus, Cravenaspis, Diplognathus, Erikaspis, Errolosteus, Eskimaspis, Euarthrodira, Eubrachythoraci, Glyptaspis, Goodradigbeeon, Grazosteus, Groenlandaspididae, Harrytoombsia, Heintzosteus, Heterostiina, Hollardosteus, Holonematina, Huaningichthys, Incisoscutoidea, Kendrickichthys, Kimberleyichthys, Kueichowlepis, Latocamurus, Laurentaspis, Lurapullaspis, Machaerognathus, Mcnamaraspis, Murmur, Mylostomatidae, Operchallosteus, Overtonaspis, Pachyosteidae, Pachyosteina, Parawilliamsaspis, Phlyctaenina, Phylctaeniida, Platyaspis, Prescottaspis, Qataraspis, Rhachiosteidae, Rolfosteus, Selenosteidae, Squamatognathus, Stegophthalami, Taemasosteus, Taunaspis, Temnothoraci, Timanosteus, Titanichthyidae, Toombalepis, Toombsosteus, Torosteus, Trachosteus, Tubonasus, Tyriolepis, Wheathillaspis, Wuttagoonaspina, Yinosteus, Phyllolepidoidei, Phlyctaenioidei, Actinolepidoidei
Subtaxa: none
Ecology: nektonic carnivore
Distribution: there are no occurrences of Brachythoracoidei in the database