Fig. 4. A–P in Morphology and Morphogenesis of a Chinese Population of the Soil Urostylid Ciliate, Extraholosticha sylvatica (Foissner, 1982) Li et al., 2017 (Ciliophora, Hypotrichia)

Fig. 4. A–P Photomicrographs of Extraholosticha sylvatica, during morphogenesis after protargol staining. (A, B) Ventral views of oral primordium of the opisthe. Arrow indicates the parental midventral cirri. (C) Dorsal view of an early divider, arrow shows dorsal kinety anlage. (D, H) Ventral views of early dividers, arrows show the development of the frontoventral-transverse cirral anlagen. (E) Ventral view of an early divider, to show the left marginal anlagen. (F) Ventral view of an early divider, arrow indicates the undulating membranes anlage. (G) Ventral view, arrow demonstrates that old adoral zone of membranelles was renewed in the rear part. (I, J) Ventral (I) and dorsal (J) views of a middle divider, to show the frontoventral-transverse cirral anlagen (arrow in I) and the fusing macronuclear nodule (arrow in J). (K) Ventral view of a late divider, arrow showing the dorsal kinety anlage. (L, M) Ventral views of a late divider, to show the old midventral pairs (arrow in L), as well as newly formed transverse cirri (arrow in M), pretransverse cirri (arrowheads), and midventral pairs (doublearrowhead). (N) Dorsal view, to show the caudal cirri (arrow). (O, P) Dorsal views, showing the micronuclei (arrow) and macronuclear nodule (P). LMA, left marginal anlagen; Ma, macronuclear nodules; Mi, micronuclei; OP, oral primordium; RMA, right marginal anlagen.