Because the fossil had no teeth, teeth-like structures, nor suggestions of either in its mouth, it was not carnivorous like many modern lampreys.
bɪkˈʌz ðə fˈɑːsəl hæd nˈoʊ tˈiːθ, tˈiːθlˈaɪk stɹˈʌktʃɚz, nˈɔːɹ sədʒˈɛstʃənz ʌv ˈiːðɚɹ ɪn ɪts mˈaʊθ, ɪt wʌz nˌɑːt kɑːɹnˈɪvɚɹəs lˈaɪk mˈɛni mˈɑːdɚn lˈæmpɹiz.