FIGURE 4 in A review of testate amoeba genus Cryptodifflugia Penard, 1890 (Phryganellina: Cryptodifflugiidae) with a key to species

FIGURE 4. Different species of the genus Cryptodifflugia: a—C. crenulata, lateral view, b—C. crenulata glabra, lateral view, c—C. crenulata globosa, lateral view, d–f—C. horrida, lateral view of empty shell (d), lateral view of living cell (e), apertural view of living cell (f). a, c—after Palyfair 1917, b, d–f—after Schönborn 1965. Scale bar 20 µm.