ɐn ˈɛlɪmənt ʌvðə mˈiːdiːən ˈoːɹəl plˈeɪts ðæt wʊd kˌɔːɹɪspˈɑːnd tə ðə lˈoʊɚ lˈɪp ɔːɹ tʃˈɪn ɪn nˈæθəstˌoʊmz ɛkstˈɛndz ˈaʊt ɪn ɐ lˈɔŋ ɹˈɑːdʃˈeɪpt ɐpˈɛndɪdʒ, kˈɔːld ðə "sˈuːdoʊɹˌɑːstɹəm."
An element of the median oral plates (that would correspond to the lower lip or chin in gnathostomes) extends out in a long rod-shaped appendage, called the "pseudorostrum."