cephalochordates

/S EH1 F AH0 L AH0 K AO1 R D EY0 T S/
noun
  1. 1

    Any of the primitive fishlike creatures, of the subphylum Cephalochordata, including the lancelets, that lack a true spine but have a notochord which, in the case of cephalochordates, reaches into the head, contrary to the Urochordata

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Source: https://en.wiktionary.org/wiki/cephalochordate, https://en.wiktionary.org/wiki/cephalochordates