Figure 4 in Morphology, morphogenesis, and molecular phylogeny of a new marine urostylid ciliate (Ciliophora, Stichotrichia) from the South China Sea, and a brief overview of the convergent evolution of the midventral pattern within the Spirotrichea

Figure 4. Photomicrographs of Bergeriella ovata gen. et sp. nov. after impregnation with protargol. A, infraciliature of the ventral posterior portion, showing the nonmigratory row (arrow), the postoral (arrowheads), and the left ventral cirri (double arrowheads). B, infraciliature of an anterior portion, showing the frontal cirri (arrows), buccal cirri (arrowhead), and the undulating membranes (double arrowheads). C, left lateral view, showing the left ventral rows, and the left marginal row (arrow). D, dorsal kineties, in which kinetosomes become more densely spaced from left to right (arrows). E, dorsal view, showing the anterior portion of the nonmigratory row (arrowhead) and the right marginal row (arrow). F, nuclear apparatus, some with replication bands can be seen. G, H, ventral and dorsal views of an early stage divider, showing the undulating membrane anlagen (arrow in G), FVT anlagen (arrowheads), and the anlagen for the nonmigratory row, which come from the posteriormost FVT streak (double arrowheads) of the opisthe. The arrows in (H) indicate the dorsal kineties anlagen. I, early divider showing the appearance of the oral primordium (arrow) and the enlarged macronuclear nodules of the proter. J, separating ellipsoid macronuclear nodules. K, L, ventral views of a late-stage divider (same specimen), showing the developed cirri of the proter (K) and the opisthe (L); the arrows indicate the migrating postoral and left ventral cirri, and the arrowheads indicate the anlagen for the nonmigratory row. M, dorsal view of the same specimen shown in (K) and (L), showing the anlagen of the marginal rows (arrows) and the new dorsal kineties.