FIGURE 3. Frontonia didieri n in Taxonomic studies on three marine species of Frontonia from northern China: F. didieri n. sp., F. multinucleata n. sp. and F. tchibisovae Burkovsky, 1970 (Ciliophora: Peniculida)

FIGURE 3. Frontonia didieri n. sp. from living cells (A, B, E, I, J), after silver carbonate (G, H), silver nitrate (C, D, K) and protargol (F) impregnations. (A) Ventral view, to show the typical body shape. (B, G) Anterior ventral part. Note the buccal cavity (arrow) and the extrusomes (arrowheads) in B. (C) Ventral view of a specimen. (D) To show the silverline system, arrow marks the CVP. (E) A pressed cell filled with diatoms. (F) Oral apparatus. Arrows indicate the vestibular kineties, arrowheads mark the posterior ends of kinety rows in P1, while double-arrowheads refer to the paroral membrane. (H) The macronucleus. (I) Arrow marks the CVP. (J) To show the contractile vacuole and the collecting canals (arrowheads). (K) To show the detail of the structure of P3. Note the shortest (arrowhead), the median-long (doublearrowheads) and the longest rows (arrow). Scale bars in (C) = 30 µm; in (J) = 40 µm; in (E) = 50 µm; in (A) = 70 µm.