Abstract
SUMMARY The small protonephridial capillaries and flame buibs of Trematoda Aspidogastrea, Digenea, Monogenea Polyopisthocotylea and Monopisthocotylea have a longitudinal septate junction which is absent in Udonella, Amphilinidea, Gyrocotylidea and Eucestoda. Capillaries of most species of the first group possess lamellae whereas those of the second group (except Udonella) possess short microvilli. External leptotriches are well developed in the first, but absent or weakiy developed in the second group. In the monopisthocotylean monogenean Anoplodiscus, the septate junction of the capillaries is rudimentary, probably due to secondary reduction. The ultrastructural findings and DNA studies do not support the view that Monogenea and Cestoda form a taxon with an origin different from that of the other groups of parasitic Platyhelminthes. Gyrocotyle is a cestode, as indicated by the ultrastructure of the protonephridia and DNA sequencing.
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