Agnatha
Genus

Phialaspis Wills, 1935

Luokittelu
Organism groupBiota
KingdomAnimalia
PhylumChordata
SubphylumVertebrata
SuperclassAgnatha
ClassPteraspidomorphi
SubclassHeterostraci
OrderPhialaspidiformes
FamilyPhialaspididae
GenusPhialaspis
Speciessymondsi