Some species, such as the Canadian T. inauditus, are thought to be comparable in size to other thelodonts, i.e., from 5 to 15 centimeters in length.
sˌʌm spˈiːsiːz, sˈʌtʃ ɐz ðə kɐnˈeɪdiən tˈiː. ɪnˈɔːdɪɾəs, ɑːɹ θˈɔːt təbi kˈɑːmpɚɹəbəl ɪn sˈaɪz tʊ ˈʌðɚ ðəlˈɑːdɔnts, ˈaɪ.ˈiː., fɹʌm fˈaɪv tə fˈɪftiːn sˈɛntɪmˌiːɾɚz ɪn lˈɛŋθ.