Some of Aristotle's zoological observations found in his biology, such as on the hectocotyl (reproductive) arm of the octopus, were disbelieved until the 19th century.
sˌʌm ʌv ˈæɹɪstˌɑːɾəlz zˌuːəlˈɑːdʒɪkəl ɑːbzɚvˈeɪʃənz fˈaʊnd ɪn hɪz baɪˈɑːlədʒi, sˈʌtʃ ɐz ɔnðə hˈɛktəkˌɑːɾaɪl ɹᵻpɹədˈʌktɪv ˈɑːɹm ʌvðɪ ˈɑːktəpəs, wɜː dˌɪsbᵻlˈiːvd ʌntˈɪl ðə nˈaɪntiːnθ sˈɛntʃɚɹi.