ˈɔːl spˈiːsiːz pəzˈɛst ɐ lˈɔŋ spˈeɪðlˈaɪk ɹˈɑːstɹəm dᵻɹˈaɪvd fɹʌmðɪ æntˈiəɹɪɚmˈoʊst ˈɛnd ʌvðə hˈɛd ʃˈiːld, wˌɪtʃ wʊdhɐv ɛnhˈænst ðə fˈɪʃᵻz hˌaɪdɹədaɪnˈæmɪks ænd wʌz pɹˈɑːbəbli ˈɔːlsoʊ jˈuːzd tə ɹˈuːt ˈaʊt fˈuːd bˈɛɹid bᵻnˌiːθ ðə sˈʌbstɹeɪt.
All species possessed a long spathe-like rostrum derived from the anterior-most end of the head shield, which would have enhanced the fish's hydrodynamics and was probably also used to root out food buried beneath the substrate.