phylum vs Cephalochordata

Other hyponyms of phylum include phylum Pyrrophyta, Pyrrophyta, phylum Protozoa, Protozoa, Cryptophyta, phylum Cryptophyta, Chordata, phylum Chordata, subphylum Cephalochordata, subphylum Tunicata, subphylum Urochorda, subphylum Urochordata, Tunicata, Urochorda, Urochordata, Craniata, subphylum Craniata, subphylum Vertebrata, Vertebrata, Arthropoda, phylum Arthropoda, Pentastomida, subphylum Pentastomida, phylum Porifera, Porifera, Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata, Ctenophora, phylum Ctenophora, Acanthocephala, phylum Acanthocephala, Chaetognatha, phylum Chaetognatha, phylum Platyhelminthes, Platyhelminthes, Nemertea, Nemertina, phylum Nemertea, phylum Nemertina, phylum Pogonophora, Pogonophora, phylum Rotifera, Rotifera, Aschelminthes, Nematoda, phylum Aschelminthes, phylum Nematoda, Annelida, phylum Annelida, Mollusca, phylum Mollusca, Phoronida, Phoronidea, phylum Phoronida, Bryozoa, phylum Bryozoa, polyzoa, Ectoprocta, phylum Ectoprocta, Endoprocta, Entoprocta, phylum Entoprocta, Cycliophora, phylum Cycliophora, Brachiopoda, phylum Brachiopoda, phylum Sipuncula, Sipuncula, Echinodermata, phylum Echinodermata, division.