Figs 9A–H. Notohymena australis after protargol impregnation. A in Two Oxytrichids from the Ancient Lake Biwa, Japan, with Notes on Morphogenesis of Notohymena australis (Ciliophora, Sporadotrichida)

Figs 9A–H. Notohymena australis after protargol impregnation. A – ventral view of middle part of an early divider, showing oral primordium; B, C – ventral view of proter (B) and opisthe (C) of the same middle divider, showing the formation of frontal-ventral-transverse cirral anlagen in proter and opisthe, and anlagen of marginal rows (arrows), and dedifferentiation of anterior end of undulating membranes (arrowhead); D – ventral infraciliature of a proter of a middle divider, showing frontal-ventral-transverse cirral anlagen beginning to organize into new cirri from anterior (arrows) and a small anlage separating from anterior right end of undulating membranes anlagen (arrowhead); E – part of a middle divider in dorsal view, showing fused macronuclear mass (arrow); F – ventral infraciliature of the same divider as in E, showing development of anlagen of the leftmost frontal cirrus (arrowheads), and frontal-ventral-transverse cirral anlagen (arrows); G – ventral infraciliature of a middle-late divider, showing frontal-ventral-transverse cirral anlagen segregating into new cirri (arrows), the anlage of the leftmost frontal cirrus separating from undulating membrane anlagen (arrowheads), and fused macronuclear mass; H – ventral infraciliature of a late divider, showing the formation of anlagen of dorsomarginal kineties at anterior right end of right marginal rows anlagen (arrows) and anterior part of newly formed adoral zone of membranelles curving to right in the opisthe, frontal-ventral-transverse cirral anlagen II – VI segregating into 3, 3, 3, 4 and 4 cirri, the leftmost frontal cirrus originated from undulating membranes anlagen (arrowheads). DKA – dorsal kinety anlage, LMA – anlage of left marginal row, OP – oral primordium, RMA – anlagen of right marginal row. Scale bars: 40 μm.