ˈɔːl ʌv ðiːz nˈoʊdz hæv pˌɑːlˈɪɡənəl bˈeɪsᵻz, ʌnlˈaɪk ðə ɹˈaʊndᵻd nˈɑːdʒuːlz ɪn pˌækɪsˌɛfɐləsˈɔːɹəs, wɪð dɪstˈɪŋkt ɡɹˈuːvz sˈɛpɚɹˌeɪɾɪŋ ðˌɛm.
All of these nodes have polygonal bases, unlike the rounded nodules in Pachycephalosaurus, with distinct grooves separating them.