There is an even sharper debate about whether Wiwaxia, from about , was a mollusc, and much of this centers on whether its feeding apparatus was a type of radula or more similar to that of some polychaete worms.
ðɛɹ ɪz ɐn ˈiːvən ʃˈɑːɹpɚ dᵻbˈeɪt ɐbˌaʊt wˈɛðɚ wɪwˈeɪksiə, fɹʌm ɐbˈaʊt , wʌzɐ mˈɑːlʌsk, ænd mˈʌtʃ ʌv ðɪs sˈɛntɚz ˌɔn wˈɛðɚɹ ɪts fˈiːdɪŋ ˌæpɚɹˈæɾəs wʌzɐ tˈaɪp ʌv ɹˈædʒələ ɔːɹ mˈoːɹ sˈɪmɪlɚ tə ðæt ʌv sˌʌm pˌɑːlɪkˈiːt wˈɜːmz.