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Biota (Life)
Eukaryote (Eukarya)
Podiata
Unikont (Unikonta)
Opisthokont (Opisthokonta)
Holozoa
Filozoa
Apoikozoa (Choanozoa)
Animal (Animalia)
Metazoa
Epitheliozoa
Eumetazoa
Bilateria
Deuterostome (Deuterostomia)
Chordata (Chordates)
Olfactores
Craniata (Craniata (chordata))
Vertebrata (Animals with backbone)
Agnatha
Cephalaspidomorphi (Cephalaspidomorphs)

Tremataspidiformes (21348323)

Children (3 direct children, 10 direct and indirect children):

Tahulaspis (tree size 2)

Tremataspidoidei (tree size 4)

Eldaaspis (tree size 1)