conodonts

/K AA1 N AH0 D AA1 N T S/
noun
  1. 1

    Any of several extinct fish-like chordates having cone-like teeth.

  2. 2

    A microfossil tooth of such an animal.

Source: https://en.wiktionary.org/wiki/conodont, https://en.wiktionary.org/wiki/conodonts