Fig. 4 in Studies on Three Diverse Frontonia Species (Ciliophora, Peniculida), with Brief Notes on 14 Marine or Brackish Congeners

Fig. 4. Frontonia schaefferi in vivo (A–C, H–N) and after protargol (E–G, O–Q) and silver nitrate (D) impregnation. A, H – ventral view of a typical individual, arrow shows the single contractile vacuole and arrowhead shows a large algal cell; B – different body shapes; C – single contractile vacuole with about 8 long collecting canals; D – part of argyrome; E, F – infraciliature in ventral and dorsal views, macronucleus, and contractile vacuole pore; G – infraciliature of the buccal area; I, K – ventral view of two individuals showing different shapes; J – buccal area, arrows show anterior suture; L – extrusomes (arrows) beneath pellicle; M – lateral view; N – extruded extrusomes; O-Q – structure of buccal region, arrow on P depicts paroral membrane, arrows on Q depict cytopharyngeal fibers. CF – cytopharyngeal fibres; CVP – contractile vacuole pore; Ma – macronucleus; P1–P3 – peniculi 1, 2, 3; PM – paroral membrane; PK – postoral kineties; VK – vestibular kineties. Scale bars: A = 40 μm, E, F = 50 μm, H, I, K, M = 70 μm.