Fig. 4 in Integrative taxonomy of five astome ciliates (Ciliophora, Astomatia) isolated from earthworms in Central Europe

Fig. 4. Metaradiophrya lumbrici (Dujardin, 1841), Slovak specimens in vivo. A–B. Ventral view of representative specimens, showing the typical body shape, localization of the fibrillar hook, the long rod-like macronucleus and two staggered rows of contractile vacuoles (arrowheads). C–D. Detail, showing the long rod-like macronucleus, a single micronucleus, contractile vacuoles and cytoplasmic bacteria. The central region of the micronucleus appears homogenous and brighter than its margin in the differential interference optics and might represent a central nucleolus. E–F. Somatic ciliature is holotrichous and composed of very densely ciliated meridional kineties. In the posterior body region, lateral somatic kineties form a right and a left subterminal suture (arrow in E), whose detail is shown in the left inset. Scale bars: A–B = 100 µm; C–D = 10 µm; E–F = 20 µm.