ðə tˈuː dʒˈɛnɚɹə ɑːɹ sˈʌmtaɪmz θˈɔːt təbi sˈɪstɚ tˈæksə, bˌʌt ɪnˈʌf dˈɪfɹənsᵻz əkˈɜː bᵻtwˌiːn ðˌɛm tə sədʒˈɛst ðə sˌɪmɪlˈæɹᵻɾiz mˈeɪ biː dˈuː tə kənvˈɜːdʒənt ˌɛvəlˈuːʃən, bˈeɪst ˌɔn ðɛɹ ˌædæptˈeɪʃən tə jˈuːz ðə sˈeɪm hˈoʊst plˈænts.
The two genera are sometimes thought to be sister taxa, but enough differences occur between them to suggest the similarities may be due to convergent evolution, based on their adaptation to use the same host plants.