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1

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

100%
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.
2

Frontal glands in the pseudoscolex of Paraechinophallus japonicus [Yamaguti, 1934] [Cestoda, Bothriocephalidea, Echinophallidae]

100%
Poddubnaya L. G., Scholz T., Levron C., Kuchta R., Gibson D. I.
Acta Parasitologica
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2007
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tom 52
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nr 4
The glands in the pseudoscolex of the echinophallid cestode Paraechinophallus japonicus (Bothriocephalidea), a parasite of the bathypelagic fish Psenopsis anomala (Perciformes, Centrolophidae), were studied using scanning and transmission electron microscopy. Two types of glands, with different morphological types of secretory granules and mechanisms for discharging their glandular secretion, were observed. Both types of gland cell bodies are localized in the parenchyma of the pseudoscolex. The syncytial glands of type I are characterized by the production of small (all ∼0.25 μm in diameter), rounded, dense secretory granules which pass though thin projections into the distal tegumental layer of the pseudoscolex. This type of gland has a unique method of discharging its secretory granules, which we call tumulogenesis. The elimination of the secretory products is realized by an encroachment of the basement membrane and underlying tegumental muscles into the surface region of the distal cytoplasm of the tegument, resulting in the formation of a ‘glandular stalk’ above which develops a superficial glandular tumulus. In the region of the glandular material of the tumulus, the basement membrane of the stalk forms a dilation, and the appearance of a membrane-bound area serves to separate the tumulus from the distal cytoplasm of the tegument. Unicellular glands of type II are characterized by large granules (0.4–0.9 μm in diameter), the presence of peripheral microtubules in the terminal region of their ducts and an eccrine mechanism for the discharge of their secretory granules. A comparative analysis of the distribution and morphology of the types of scolex glands among members of the different families of the ‘Pseudophyllidea’ (currently believed to represent two distinct orders, Bothriocephalidea and Diphyllobothriidea) is presented.
3

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

88%
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.
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