ðeɪ duːnˌɑːt hæv pˈɛlvɪk fˈɪnz ænd ðɛɹˌɑːɹ nˈoʊ skˈeɪlz ˌɔn ðɛɹ bˈɑːdi bˌʌt ɪn wˈʌn spˈiːsiːz ðə bˈɑːdi ɪz kˈʌvɚd ɪn pˈæpɪlˌiː.
They do not have pelvic fins and there are no scales on their body but in one species the body is covered in papillae.