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

• Autorzy: Swiderski Z. , Poddubnaya L. G. , Gibson D. I. , Mlocicki D.
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

Aspidogastrea; Aspidogastridae; Aspidogaster limacoides; embryogenesis; cotylocidial morphogenesis; intrauterine egg; ultrastructure; embryonic development; morphogenesis; blastomere; mitotic division

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2012
• Tom: 57
• Numer: 2
• Opis fizyczny: p.131-148,fig.,ref.

Twórcy

autor

Swiderski Z.

• W. Stefanski Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Poland

autor

Poddubnaya L. G.

autor

Gibson D. I.

autor

Mlocicki D.

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