Ultrastructural characteristics of the protonephridial terminal organ and associated ducts of adult specimens of the Aspidogastrea, Digenea and Monogenea, with comments on the relationships between these groups.

Systematic Parasitology
Larisa G PoddubnayaDavid I Gibson

Abstract

Transmission electron microscopical observations were made on the protonephridial terminal organ and associated ducts of three adult trematodes, the aspidogastrean Aspidogaster limacoides Diesing, 1835 and the digeneans Azygia lucii (Müller, 1776) and Phyllodistomum angulatum Linstow, 1907, and the monogenean Ancyrocephalus paradoxus Creplin, 1839. Previously unreported ultrastructural details of the terminal organ of adult trematodes include multiple contact sites (septate junctions and zonulae adherentes) between the membranes of the terminal and adjacent canal cells. Septate junctions traverse the epithelial cytoplasm of the canal wall, and the same type of septate junctions are observed within the cytoplasmic cord at the level of the tip of the flame tuft in both longitudinal and oblique sections of all three trematode species studied. In the monopisthocotylean Ancyrocephalus paradoxus, the absence of any junctions in the cytoplasmic cord and the presence of septate junction within all of the protonephridial ducts are reported. On the basis of the small number of monogenean species in which these features have been studied, in relation to the size of the group, there seems to be a high diversity in some characters of the pr...Continue Reading

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