FIGURES 18–20 in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 18–20. Cirrus of Temnocephala caddisflyi n. sp. from trichopterans, seen with Nomarski´s differential interference contrast microscopy (DIC). 18. Photomicrograph of the entire 'complex' cirrus, Scale bar = 100 µm. 19. Limit of the introvert portion with the shaft (black arrow), forward projecting dorsal retractor muscle (fprm), and ventral retractor muscle (rm). Scale bar = 50 µm. 20. Introvert´s swelling portion (ii) and the long spines which run along the inner wall, showing the rows of spines. Scale bar = 10 µm. FIGURES 21–23. Cirrus of Temnocephala curvicirri from belostomatid hemipterans, seen with DIC. 21. Entire 'complex' cirrus. Scale bar = 200 µm. 22. Limit of the introvert portion with the shaft (arrow), forward projecting dorsal retractor muscle (fprm), and ventral retractor muscle (rm). Scale bar = 50 µm. 23. Distal introvert´s swelling portion (ii), showing the rows of spines. Scale bar = 10 µm.