subclass Holocephali

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Noun1.subclass Holocephali - chimaeras and extinct forms
Chondrichthyes, class Chondrichthyes - cartilaginous fishes
holocephalan, holocephalian - fish with high compressed head and a body tapering off into a long tail
Chimaeridae, family Chimaeridae - a family of Holocephali
class - (biology) a taxonomic group containing one or more orders