NDLI: 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

Content Provider	Springer Nature Link
Author	Poddubnaya, Larisa G. Xylander, Willi E. R. Gibson, David I.
Copyright Year	2012
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 protonephridial terminal organ. The study confirms that the Aspidogastrea and Digenea possess the same morphology of their protonephridial terminal organ and, although this differs slightly from that of most members of the Monogenea so far studied, it supports previous views on the close relationship of these groups.
Starting Page	89
Ending Page	104
Page Count	16
File Format	PDF
ISSN	01655752
Journal	Systematic Parasitology
Volume Number	82
Issue Number	2
e-ISSN	15735192
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zoology Animal Systematics/Taxonomy/Biogeography Animal Anatomy Morphology Histology Agriculture Animal Ecology Life Sciences
Content Type	Text
Resource Type	Article
Subject	Parasitology

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