bɪkˈʌz ðə ɹᵻlˈeɪʃənʃˌɪps bᵻtwˌiːn ðə mˈɛmbɚz ʌvðə fˈæmɪli tɹˈiː ɑːɹ ʌnsˈɜːʔn̩, ɪɾ ɪz dˈɪfɪkəlt tʊ aɪdˈɛntᵻfˌaɪ ðə fˈiːtʃɚz ɪnhˈɛɹɪɾᵻd fɹʌmðə lˈæst kˈɑːmən ˈænsɛstɚɹ ʌv ˈɔːl mˈɑːlʌsks.
Because the relationships between the members of the family tree are uncertain, it is difficult to identify the features inherited from the last common ancestor of all molluscs.