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Some remarks on the broad specificity of Fimbriaria fasciolaris [Cestoda, Hymenolepididae] in relation to final and intermediate hosts

100%

Grytner-Ziecina B., Sulgostowska T., Cielecka D., Chomicz L.

Acta Parasitologica

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1996

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tom 41

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nr 4

Research resulting in the description of six new species representing the genus Fimbriaria has thus revealed that the former Fimbriaria fasciolaris (Pallas, 1781) was in fact a group of species. In the light of this, the long list of final and intermediate hosts for this species may in fact result from earlier errors in identification. Proper diagnosis of Fimbriaria to the level of the species should be based on penetrating morphological studies of adult forms which would take account of: the structure of the oncospheral envelope, the number of genital primordia per segment of the strobila, the number of spines at the cirrus base and the length of the cirrus pouch. Proper diagnosis of species at the larval stage is practically impossible in natural infections because of the great similarity between the larvae of different species. The present state of knowledge of the genus Fimbriaria calls for a revision review of the broad specificity of the whole group in relation to both final and intermediate hosts.

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Transmission electron microscopy studies on the tegument of two species of genus Fimbriaria Froelich, 1802

67%

Grytner-Ziecina B., Cielecka D., Chomicz L.

Acta Parasitologica

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1995

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tom 40

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nr 2

Comparative studies on the tegument of F. fasciolaris (Pallas, 1781) and F. czaplinskii Grytner-Zięcina, 1994, using transmission electron microscopy revealed in both species examined evident differences in the morphology of the tegument surface from various parts of the cestode body (scolex, pseudoscolex, strobila). Two categories of microtriches, characteristic for both studied fimbriariids, were found: (1) typical microtriches with a well developed basal part and an osmiophilic spine at the apex, present on the scolex and on the fan-like, polar side of the pseudoscolex, and (2) non-typical spineless microtriches, present on the small, aporal part of the pseudoscolex and on the whole surface of the strobila. The presence of numerous spiny microtriches on the pseudoscolex perhaps indicates an important role for the peculiar holdfast organ, in supporting the scolex in securing the attachment of fimbriariid cestodes in the host intestine. Details of the tegument ultrastructure of Fimbriaria species are described and compared with other cestodes, and their significance is discussed.

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Verification of features of the genus Fimbriaria [Froelich, 1802] and a key to the identification of species

59%

Grytner-Ziecina B., Cielecka D., Chomicz L., Ziecina R.

Acta Parasitologica

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1998

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tom 43

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nr 3

Knowledge to date on the morphology of Fimbriaria tapeworms is summarised, with features of the genus being verified and augmented by some not previously taken account of, like the ultrastructure of the tegument. The most important features in accurate identification to the level of the species are the structure of the oncospheral envelope and the manner in which eggs are released from the uterus. Other features of diagnostic importance are the number of primordia of reproductive organs, the number of hooks at the cirrus base and the dimensions of the cirrus and cirrus pouches. A key to the identification of species is provided.

Ograniczanie wyników

3 Acta Parasitologica

3 Chomicz L.

3 Cielecka D.

3 Grytner-Ziecina B.

1 Sulgostowska T.

1 Ziecina R.

1 1998

1 1996

1 1995

Some remarks on the broad specificity of Fimbriaria fasciolaris [Cestoda, Hymenolepididae] in relation to final and intermediate hosts

Transmission electron microscopy studies on the tegument of two species of genus Fimbriaria Froelich, 1802

Verification of features of the genus Fimbriaria [Froelich, 1802] and a key to the identification of species