Wyniki wyszukiwania - Biblioteka Nauki

1

Aspidogastreans (Trematoda: Aspidogastrea) in native unionids

100%

Cichy A. , Marszewska A.

Folia Malacologica

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2016

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tom 24

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nr 1

2

The first record of Aspidogaster limacoides Diesing, 1834 [Aspidogastridae: Aspidogastrea] in Poland

84%

Popiolek M. , Luczynski T. , Jarnecki H.

Wiadomości Parazytologiczne

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2007

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tom 53

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nr 2

3

Anomalie w budowie osierdzia Anodonta cellensis Schroter, 1779 [Bivalvia, Eulamellibranchia, Unionidae] wywolane dzialalnoscia Aspidogaster conchicola Baer, 1826 [Aspidogastrea]

67%

Wasielewski L. , Drozdowski A.

Acta Universitatis Nicolai Copernici. Biologia

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1995

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tom 49[94]

33-43

4

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

67%

Poddubnaya L. G. , Levron C. , Gibson D. I.

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2011

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tom 56

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nr 2

EN

The ultrastructure of the uterus proper of the aspidogastrean Aspidogaster limacoides Diesing, 1835 and two digenean species, Phyllodistomum angulatum Linstow, 1907 (Plagiorchiida, Gorgoderidae) and Azygia lucii (Müller, 1776) (Strigeida, Azygiidae), was examined by transmission electron microscopy (TEM). The uterine epithelial lining of these species is thin, except for the perinuclear region of the epithelial cells. Septate junctions occur between adjacent epithelial cells within the uterine wall. The luminal surface of the cells is elevated into microlamellae, which project into the uterine lumen and cover the entire epithelial lining. Basally the uterine epithelium is attached to a basal matrix, and its supporting layers of muscle fibres are weak and composed of scattered circular muscles. Despite the marked similarity in the ultrastructural pattern of the aspidogastrean and two digeneans studied, there is some degree of variation in the secretory activity of their uterine epithelium. The high level of vesicular exocytotic activity in the epithelial cytoplasm of A. lucii may be associated with differences in egg emission and the subsequent life cycle involving a non-ciliated, non-swimming and non-free-living miracidium, as opposed to the free-swimming miracidium of P. angulatum. The similar nature of the uterine epithelium in all three species studied represents an ultrastructural marker possibly supporting a close phylogenetic relationship between the Aspidogastrea and the Digenea.

5

Advanced stages of embryonic development and cotylocidial morphogenesis in the intrauterine eggs of Aspidogaster limacoides Diesing, 1835 (Aspidogastrea), with comments on their phylogenetic implications

67%

Swiderski Z. , Poddubnaya L. G. , Gibson D. I. , Mlocicki D.

Acta Parasitologica

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2012

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tom 57

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nr 2

EN

Ultrastructural aspects of the advanced embryonic development and cotylocidial morphogenesis of the aspidogastrean Aspidogaster limacoides are described. The posterior or distal regions of the uterus are filled with eggs containing larvae at advanced stages of morphogenesis and fully-formed cotylocidia. Various stages and organs of this larva are described in detail, including the aspects of the developing and fully-differentiated cotylocidium, the body wall (tegument and musculature), glandular regions and the protonephridial excretory system. Blastomere multiplication by means of mitotic divisions takes place simultaneously with the degeneration or apoptosis of some micromeres; this frequently observed characteristic is compared and discussed in relation to corresponding reports for other neodermatans. During the advanced stages of the embryonic development of A. limacoides, the vitelline syncytium disappears and the size of the embryo increases rapidly. Evident polarization of the differentiating larva was observed; towards one pole of the egg, cytodifferentiation of the mouth, surrounded by the oral sucker and cephalic glands, takes place, whereas, towards the opposite pole, differentiation of the posterior sucker (incipient ventral disc) occurs. The oral and posterior suckers are formed from numerous embryonic cells which have differentiated into myocytes. The central part of the oral sucker undergoes invagination and forms the future pharynx and intestine. Fully-developed cotylocidia of A. limacoides have a neodermatan type of tegument, flame cells and two types of glandular structures. These results suggest a sister relationship between the Aspidogastrea and the Digenea, although the systematic position of aspidogastreans in relation to other platyhelminth taxa remains somewhat equivocal.

FR

Les aspects ultrastructuraux du développement embryonnaire avancé et de la morphogenèse du cotylocidium de l’aspidogastre Aspidogaster limacoides sont décrits. Les régions postérieures et distales de l’utérus sont remplies d’oeufs qui contiennent des larves à des stades avancés de morphogenèse et des cotylocidia complètement formés. Des stades et organes variés de la larve sont décrits en détail, y compris les aspects du cotylocidium en développement et complètement développé, la paroi du corps (tégument et musculature), les régions glandulaires et le système excréteur protonéphridien. La multiplication des blastomères par des divisions mitotiques, prend place simultanément à la dégénération ou apoptose de certains micromères. Cette caractéristique fréquemment observée, est comparée et discutée par rapport à des études similaires correspondantes aux autres Neodermata. Pendant les stades avancés du développement embryonnaire de A. limacoides, le syncytium vitellin disparaît et la taille de l’embryon augmente rapidement. Nous avons observé une polarisation évidente de la larve en différentiation: vers unpôle de l’oeuf prend place la cytodifférentiation de la bouche, entourée par la ventouse ventrale et les glandes céphaliques, alors que la différentiation de la ventouse postérieure (disque ventral en formation) a lieu au pôle opposé. Les ventouses orales et postérieures sont formées à partir de nombreuses cellules embryonnaires qui se sont différenciées en myocytes. La partie centrale de la ventouse orale s’invagine et forme le futur pharynx et le future intestin. Les cotylocidia complètement développés de A. limacoides ont un tégument de type Neodermata, des cellules-flammes et deux types de structures glandulaires. Ces résultats suggèrent que les Aspidogastrea et Digenea sont des groupes frères, bien que la position systématique des aspidogastres par rapport aux autres taxons de Plathelminthes reste quelque peu équivoque.

6

Scanning electron-microscopic studies of Multicalyx elegans [Olsson, 1869] [Aspidogastrea, Multicalycidae]

67%

Rohde K.

Acta Parasitologica

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1998

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tom 43

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nr 1

EN

The body of Multicalyx elegans consists of a dorsal main part and a ventral disc subdivided into compartments (alveoli) by transverse septa which carry pairs of “foot”-like lateral organs. The dorsal lip contains a groove with a large number of receptors. Numerous bulbous receptors and pits are also found in other parts of the body, which is covered by a tegument bearing densely packed microtubercles. Small particles associated with the body surface may represent viruses or bacteria.

7

Unionid clams and the zebra mussels on their shells (Bivalvia: Unionidae, Dreissenidae) as hosts for trematodes in lakes of the Polish lowland

59%

Marszewska A. , Cichy A.

Folia Malacologica

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2015

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tom 23

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nr 2