Stereoscan studies of rediae, cercariae, cysts, excysted metacercariae and migratory stages of Fasciola hepatica (original) (raw)

Summary

The external surface of the redial body of Fasciola hepatica is provided with microvillus-like projections or short lamellae, and short cilium-like structures are common anteriorly.

The anterior part of the cercarial body possesses a pattern of regularly arranged small depressions each containing a spine. Both long and short cilium-like structures occur anteriorly. The tail is spineless and provided with dorsolateral folds.

The outer cyst wall is formed by granules secreted from the tegument all over the body apart from the ventral sucker. Most granules transform into fibrillae which form the thick outer spongy layer.

The precursor of the inner cyst wall is at the beginning closely attached to the metacercarial surface, but later the membrane-like cyst wall extends, and when fully formed the metacercaria lies free in the flattened circular inner cyst. The ventral plug is formed by the ventral sucker.

The tegument of newly excysted metacercariae is provided with simple pointed spines, but later during migration in the mouse the spines become flattened and multipointed. Very young migratory stages may be attached with host cells.

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Authors and Affiliations

1. Marine Biological Laboratory, DK-3000, Helsingør, Denmark
   Marianne Køie
2. The Danish Agricultural and Veterinary Research Council, Parasitological Research Group, Royal Veterinary and Agricultural University, Bülowsvej 13, DK-1870, Copenhagen, Denmark
   Peter Nansen
3. Danish Bilharziasis Laboratory, Jægersborg Alle 1D, DK-2920, Charlottenlund, Denmark
   Niels Ørnbjerg Christensen

Authors

1. Marianne Køie
2. Peter Nansen
3. Niels Ørnbjerg Christensen

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Køie, M., Nansen, P. & Christensen, N.Ø. Stereoscan studies of rediae, cercariae, cysts, excysted metacercariae and migratory stages of Fasciola hepatica.Z. F. Parasitenkunde 54, 289–297 (1977). https://doi.org/10.1007/BF00390120

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• Received: 13 June 1977
• Issue date: January 1977
• DOI: https://doi.org/10.1007/BF00390120

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