They have three pairs of external red feathery gills, a blunt head with two rudimentary eyes, a lateral line system and a short tail with fins.
ðeɪ hæv θɹˈiː pˈɛɹz ʌv ɛkstˈɜːnəl ɹˈɛd fˈɛðɚɹi ɡˈɪlz, ɐ blˈʌnt hˈɛd wɪð tˈuː ɹˌuːdɪmˈɛntɚɹi ˈaɪz, ɐ lˈæɾɚɹəl lˈaɪn sˈɪstəm ænd ɐ ʃˈɔːɹt tˈeɪl wɪð fˈɪnz.