mˈaɪmɐɹˌɑːmɐtˌɪdz ɑːɹ dɪstˈɪŋɡwɪʃt baɪ ðə pɹˈɛzəns əvə plˈiːɾᵻd fˈoʊldᵻd mˈɛmbɹeɪn kənˈɛktɪŋ ðə fɹˈʌnt ænd bˈæk hˈævz ʌvðə hˈɛd ɛkstˈɛndɪŋ fɹʌmðə mˈændᵻbəl tə ðə tˈɑːp ʌvðə hˈɛd, wˌɪtʃ ɪz pɹɪzˈuːməbli ɛkspˈændᵻd baɪ mˈʌsəl ɔːɹ hˌaɪdɹəstˈæɾɪk pɹˈɛʃɚ, lˈaɪkli tʊ ˈeɪd ɪn bɹˈeɪkɪŋ ˈoʊpən ðə wˈɔːlz ʌvðɪ ˈɛɡ kˈæpsjuːl.
Mymarommatids are distinguished by the presence of a pleated (folded) membrane connecting the front and back halves of the head extending from the mandible to the top of the head, which is presumably expanded by muscle or hydrostatic pressure, likely to aid in breaking open the walls of the egg capsule.