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Functional ultrastructure of eggs and cellular organization of hexacanths of the cyclophyllidean cestode Thysanotaenia congolensis: a phylogenetic implication of obtained results

Published online by Cambridge University Press:  22 December 2015

ZDZISŁAW ŚWIDERSKI ,
JORDI MIQUEL  and
DAVID BRUCE CONN
ZDZISŁAW ŚWIDERSKI*
Affiliation:
W. Stefański Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warszawa, Poland
JORDI MIQUEL
Affiliation:
Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, 08028 Barcelona, Spain Facultat de Biologia, Institut de Recerca de la Biodiversitat, Universitat de Barcelona, Av. Diagonal, 645, 08028 Barcelona, Spain
DAVID BRUCE CONN
Affiliation:
Department of Biology and One Health Center, Berry College, Mount Berry, GA 30149, USA Department of Invertebrate Zoology, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
*
*Corresponding author. W. Stefański. Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warszawa, Poland. Tel: (+ 48 22) 697 89 70. Fax: (+ 48 22) 620 62 27. E-mail: z.swider@twarda.pan.pl
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Summary

The functional ultrastructure of eggs and cellular organization of hexacanths from gravid proglottids of Thysanotaenia congolensis, from black rats from Cape Verde, were examined by transmission electron microscopy. Mature eggs with fully formed hexacanths are grouped within parenchymatous capsules of gravid proglottids. Oncospheral envelopes surrounding mature hexacanths are reduced to a very thin membranous embryophore as their protective function is taken over by the parenchymatous capsules originating from the medullary parenchyma of immature proglottids and composed of three layers. Six major cell types are present: a bi-nucleate medullary centre; a six-nucleate U-shaped penetration gland; a second type of penetration gland; two neurosecretory-type nerve cells; about 30 somatic cells; and about 12 germinative cells. Present results on the functional ultrastructure of eggs and cellular organization of hexacanths support the phylogenetic distinction between T. congolensis and cestodes of the subfamily Anoplocephalinae.

Keywords

Thysanotaenia congolensisfunctional ultrastructure of eggscellular organization of hexacanthultrastructural evidences for davaineid characters
Type
Research Article
Information
Parasitology , Volume 143 , Issue 3 , March 2016 , pp. 320 - 333
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Copyright
Copyright © Cambridge University Press 2015 

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