Ianiropsis cf. serricaudis from MCBs, Adult ♂. A labrum B left mandible C enlargement of incisor process D enlargement of lacinia mobilisE right mandible F lower lip G maxillule H enlargement of tip of outer lobe I denticulate seta J maxilla K denticulate setae L enlargement of “comb-like” setae M enlargement of finely setulate seta. Scale bars: 0.1 mm (A–B, E, F, G, J).