Fig. 2A–L. Morphogenesis of Euplotes balteatus after protargol impregnation. A, B – ventral view and macronucleus of the same specimen at an early stage to show the appearance of frontoventral transverse cirral anlagen, the developing oral primordium and macronuclear replication bands (arrows); C, D – slightly later divider, ventral view and macronucleus of the same specimen, indicating 5 FVT-cirral streaks (arrowheads) and the enlarging oral primordium; arrows point to the replication bands; E, F – ventral and dorsal views of the same specimen to show the marginal cirral anlagen (arrowheads), cirrus I/1 anlage and the newly formed dorsal kinety anlagen (DKA, macronuclear replication bands (arrows)); G, H – ventral and dorsal views of the same specimen, showing the fragmentation of the cirral anlagen, the formation of cirrus I/1 anlage for the opisthe (arrow), the UM-anlage for the opisthe and the development of the anlagen both of the marginal cirri (arrowheads) and of the dorsal kineties; I, J – ventral and dorsal views of the same middle-stage divider to show the completion of the cirral development, the differentiation of the caudal cirri (double arrowheads), the development of cirrus I/1 for the opisthe (arrow) and the marginal cirri (arrowheads); K, L – ventral and dorsal views of a late divider, showing the migration of the cirri, the development of the dorsal kineties and the dividing macronucleus. Arrowheads indicate the marginal cirri and arrows point to the caudal cirri. FVTA – frontoventral-transverse anlagen, Ma – macronucleus, DKA – dorsal kinety anlagen, MCA – migratory cirral anlagen, UMA – undulating membrane anlagen, MC – migratory cirri, OP – oral primordium. Scale bar: 30 µm.