Parent taxon: Arthrodira according to D. P. Plax and M. J. Newman 2020
See also Long 2011 and Nelson et al. 2016
Sister taxa: Acanthaspida, Actinolepidiformes, Actinolepina, Africanaspis, Antarctolepis, Arctonema, Arenipiscis, Aspidichthys, Atlantidosteus, Brachydeirina, Callognathus, Carolowilhelmina, Coccosteina, Coccosteoidei, Copanognathus, Cosmacanthus, Cravenaspis, Denisonosteus, Diplognathus, Edgellaspis, Erikaspis, Errolosteus, Eskimaspis, Euarthrodira, Eubrachythoraci, Glyptaspis, Grazosteus, Heintzosteus, Heterostiina, Hollardosteus, Holonematina, Huaningichthys, Incisoscutoidea, Kartalaspis, Kimberleyichthys, Kueichowlepis, Kunmingolepis, Laurentaspis, Lurapullaspis, Machaerognathus, Mediaspidae, Murmur, Operchallosteus, Overtonaspis, Pachyosteidae, Pachyosteina, Parawilliamsaspis, Phlyctaeniiformes, Phlyctaenina, Pholidosteidae, Phylctaeniida, Phyllolepida, Platyaspis, Prescottaspidae, Qataraspis, Squamatognathus, Stegophthalami, Taemasosteus, Taunaspis, Temnothoraci, Timanosteus, Toombalepis, Toombsosteus, Tyriolepis, Wheathillaspis, Wuttagoonaspina, Brachythoracoidei, Phyllolepidoidei
Subtaxa: Eukaia
Ecology: nektonic carnivore
Distribution: found only at Severnaya River, tributary of Nizhnaya Tunguska River, Turukhansk region (Devonian of Russian Federation)