Adult left valves of the ostracod Ilyocypris leptolinea Wang & Zhai, sp. nov. from the late Quaternary Xiaojinggou section of Inner Mongolia, China A–C XJG2-21-1 (paratype) A exterior view B interior view of the postero-ventral part, showing the marginal ripplets C interior view D–G XJG2-197-2 (paratype) D interior view E interior view of the antero-ventral part, showing the marginal ripplets and three inner lists (arrowed) F adductor muscle scars (AMS) and mandibular scars (MS) G interior view of the posterior part, showing the marginal ripplets. Scale bars: 200 μm (A, C, D); 100 μm (B, E, G); 50 μm (F).