Alternative spelling: Pachyosteida
Full reference: D. V. Obruchev. 1964. Branch Agnatha. In D. V. Obruchev (ed.), Fundamentals of Paleontology. Vol. XI. Agnatha, Pisces. Izdatel'stvo "Nauka", Moscow 36-167
Parent taxon: Arthrodira according to R. Denison 1978
See also Denison 1975 and Obruchev 1964
Sister taxa: Acanthaspida, Actinolepidiformes, Actinolepina, Africanaspis, Antarctolepis, Arctonema, Arenipiscis, Aspidichthys, Atlantidosteus, Brachydeirina, Bruntonichthys, Bullerichthys, Callognathus, Coccosteina, Copanognathus, Cosmacanthus, Cravenaspis, Diplognathus, Erikaspis, Errolosteus, Eskimaspis, Euarthrodira, Eubrachythoraci, Glyptaspis, Grazosteus, Harrytoombsia, Heintzosteus, Heterostiina, Hollardosteus, Holonematina, Huaningichthys, Incisoscutoidea, Kimberleyichthys, Kueichowlepis, Latocamurus, Laurentaspis, Lurapullaspis, Machaerognathus, Mcnamaraspis, Mediaspidae, Murmur, Operchallosteus, Overtonaspis, Pachyosteidae, Parawilliamsaspis, Phlyctaeniiformes, Phlyctaenina, Pholidosteidae, Phylctaeniida, Phyllolepida, Platyaspis, Prescottaspidae, Qataraspis, Rolfosteus, Squamatognathus, Stegophthalami, Taemasosteus, Taunaspis, Temnothoraci, Timanosteus, Toombalepis, Toombsosteus, Tubonasus, Tyriolepis, Wheathillaspis, Wuttagoonaspina, Yinosteus, Brachythoracoidei, Phyllolepidoidei, Actinolepidoidei
Subtaxa: Erromenosteidae Hussakofiidae
Distribution: there are no occurrences of Pachyosteina in the database