Hostname: page-component-5b777bbd6c-rbv74 Total loading time: 0 Render date: 2025-06-25T13:15:24.838Z Has data issue: false hasContentIssue false
  • English
  • Français

Euzetrema knoepffleri: evidence for a synchronous cycle of the gastrodermal activity and an ‘apocrine–like’ release of the residues of digestion

Published online by Cambridge University Press:  06 April 2009

Annie Fournier
Annie Fournier
Affiliation:
Dèpartement de Biologie Animale, Centre Universitaire, Avenue de Villeneuve, F 66025 Perpignan Cedex
Get access Rights & Permissions [Opens in a new window]

Summary

Euzetrema knoepffleri (Monogenea, Monopisthocotylea), an endoparasite of Euproctus montanus (Amphibia, Urodela), has a partially haematophagous diet, resembling that of the Polyopisthocotylea. In spite of this, the ultrastructural characteristics of the gastrodermis are typical of Monopisthocotylea. As in the Monogenea already described, digestion is intracellular with a lysosomal process, but two original features are evident. First, there is a cyclic activity of all the digestive cells during digestion with a synchronization of events, which enables two characteristic stages to be distinguished. Secondly, the elimination of the waste is similar to an ‘apocrine’ process, in which the apical portion of cytoplasm filled with residual bodies or the entire cell is released into the caecal lumen.

Type
Research Article
Information
Parasitology , Volume 77 , Issue 1 , August 1978 , pp. 19 - 26
Copyright
Copyright © Cambridge University Press 1978

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

Halton, D. W. (1967). Observations on the nutrition of digenetic trematodes. Parasitology 57, 639–60.CrossRefGoogle ScholarPubMed
Halton, D. W. (1974). Hemoglobin absorption in the gut of a monogenetic trematode, Diclidophora merlangi. Journal of Parasitology 60, 59–66.CrossRefGoogle Scholar
Halton, D. W. (1975). Intracellular digestion and cellular defecation in a monogenean, Diclidophora merlangi. Parasitology 70, 330–40.CrossRefGoogle Scholar
Halton, D. W. (1976). Diclidophora merlangi: sloughing and renewal of hematin cells. Experimental Parasitology 40, 41–7.CrossRefGoogle ScholarPubMed
Halton, D. W. & Jennings, J. B. (1965). Observations on the nutrition of monogenetic trematodes. Biological Bulletin 129, 257–72.CrossRefGoogle ScholarPubMed
Halton, D. W., Dermott, E. & Morris, G. P. (1968). Electron microscope studies of Diclidophora merlangi (Monogenea: Polyopisthocotylea). I. Ultrastructure of the cecal epithelium. Journal of Parasitology 54, 909–16.CrossRefGoogle Scholar
Halton, D. W. & Stranock, S. D. (1976). The fine structure and histochemistry of the caecal epithelium of Calicotyle kröyeri (Monogenea: Monopisthocotylea). International Journal for Parasitology 6, 253–63.CrossRefGoogle ScholarPubMed
Kearn, G. C. (1963). Feeding in some monogenean skin parasites: Entobdella Soleae on Solea solea and Acanthocotyle sp. on Raia clavata. Journal of the Marine Biological Association 43, 749–66.CrossRefGoogle Scholar
Llewellyn, J. (1954). Observations on the food and the gut pigment of the Polyopisthocotylea (Trematoda: Monogenea). Parasitology 44, 428–37.CrossRefGoogle ScholarPubMed
Richardson, K. C., Jarret, L. & Finke, E. H. (1960). Embedding in epoxy resins for ultrathin sectioning in electron microscopy. Stain Technology 35, 313–23.CrossRefGoogle ScholarPubMed
Robinson, G. & Threadgold, L. T. (1975). Electron microscope studies of Fasciola hepatica. XII. The fine structure of the gastrodermis. Experimental Parasitology 37, 20–36.CrossRefGoogle ScholarPubMed
Rohde, K. (1973). Ultrastructure of the caecum of Polystomoides malayi Rohde and P. renschi Rohde (Monogenea: Polystomatidae). International Journal for Parasitology 3, 461–6.CrossRefGoogle ScholarPubMed
Tinsley, R. C. (1973). Ultrastructural studies on the form and function of the gastrodermis of Protopolystoma xenopi (Monogenoidea: Polyopisthocotylea). Biological Bulletin 144, 541–55.CrossRefGoogle Scholar