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Etude ultrastructurale de la larve de Anomotaenia constricta (Cestoda, Cyclophyllidea)

Ultrastructural study of larval Anomotaenia constricta (Cestoda, Cyclophyllidea)

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Summary

The metacestode of Anomotaenia constricta, from the haemocoele of the beetle Pimelia sulcata is enclosed in a capsule and consists in a cysticercoid surrounded by follicles which proceed from the cercomer (fig. 1). The follicles are embedded in an amorph substance. The microtriches which cover the tegument are found to be of three different forms depending on their location.

The tegument of the cercomer bears fingerlike extensions (fig. 5) resembling that found in the tegument of the youngest stages (fig. 4), whereas the tegument of the extern cystic wall is covered by knoblike projections (fig. 12) which resemble the fully developed projections but without the spike portion. The outer surface of the scolex bears projections of the same type as those of adult tapeworms (fig. 10).

The differentiation of the tegument from the different parts of the metacestode is in relation with the differentiation of the cysticercoid.

The histochemical tests show that the amount of glycogen in the cercomer is slight, comparatively to those in the cysticercoid wall and in the scolex.

We discuss the role of the different larval formations in the protection and the nutrition of the metacestode.

We compare the cysticercoid structures of A. constricta and Tatria octacantha (fig. 15A et B).

Résumé

La larve de A. constricta, obtenue expérimentalement dans l'hémocoele d'un Coléoptère Pimelia sulcata évolue à l'intérieur d'une enveloppe larvaire. Entre le cysticercoïde et l'enveloppe larvaire, le cercomère se fragmente en follicules pluricellulaires qui baignent dans une substance amorphe.

Le tégument de ces follicules est bordé de microvillosités en «doigt de gant» identiques à celles qui couvrent le tégument des jeunes stades, alors que le tégument de la paroi cystique externe est surmonté de microtriches incomplètement différenciées, l'épine terminale faisant défaut. Enfin, le tégument de la paroi cystique interne et celui du scolex présentent des microtriches typiques. La différenciation du tégument des différentes formations est liée à l'évolution du cysticercoïde.

Les tests histochimiques révèlent que la quantité de glycogène contenu dans le cercomère est faible, comparativement à ce que l'on trouve dans la paroi du cysticercoïde d'une part et dans la paroi du métacestode, où il est le plus abondant, d'autre part.

On discute le rôle des différentes formations larvaires dans la protection et la nutrition du métacestode.

Enfin, on compare la structure du cysticercoïde de A. constricta à celle de Tatria octacantha, étudiée par Rees (1973).

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Authors and Affiliations

  1. Laboratoire de Parasitologie Comparée, Université des Sciences et Techniques du Languedoc, Montpellier

    Claude Gabrion

  2. Laboratoire d'Histologie et d'Embryologie, Faculté de Médecine, Montpellier

    Jacqueline Gabrion

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  1. Claude Gabrion
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  2. Jacqueline Gabrion
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Avec l'aide technique de Mademoiselle Parpère, Technicienne au Laboratoire d'Histologie et d'Embryologie, Section Microscopie Electronique et de Madame Euzet, Technicienne C.N.R.S. au Laboratoire de Parasitologie Comparée.

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Gabrion, C., Gabrion, J. Etude ultrastructurale de la larve de Anomotaenia constricta (Cestoda, Cyclophyllidea). Z. F. Parasitenkunde 49, 161–177 (1976). https://doi.org/10.1007/BF00382423

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