Classification
Animalia [rijk]Chordata [fylum]
Cephalaspidomorphi [klasse]
Petromyzontiformes [orde]
Ordo Petromyzontiformes bevat de volgende taxa:
Petromyzontidae [familie]
Chordata [fylum]
Cephalaspidomorphi [klasse]
Petromyzontiformes [orde]
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