For the first time, the ultrastructure of the armed cirrus of an echinophallid cestode, Paraechinophallus japonicus (Yamaguti, 1934), has been studied with the use of scanning and transmission electron microscopy. Two sets of eversible copulatory organs (≈300 μm in length and ≈130 μm in width) are present on the dorsal side of each segment near the lateral margin of the strobila. Except for the terminal portion, the cirrus is covered with large spines (up to 40 μm long, measured from SEM photomicrographs) composed of 2 parts. The basal portion contains a lobed electron-dense outer region that gives way to a reticular meshwork of electron-dense material. The apical region of the spines, composed of a homogeneous, moderately electron-dense matrix, is slightly curved distally. Spines are covered with a cortical zone. Between the spines, the distal cytoplasm is covered with microvilli of about 1.2 μm in length. The wall of the cirrus sac, which is ≈500 μm long and ≈250 μm wide, is composed of 2 layers of muscles, i.e., an internal layer of circular muscles and external longitudinal muscles. Microvilli on the cirrus of P. japonicus are reported for the first time in the Cestoda, whereas the spines on the cirrus may represent a synapomorphy of bothriocephalidean cestodes of the Echinophallidae.
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August 2008
FUNCTIONAL MORPHOLOGY|
August 01 2008
Sem and Tem Study of the Armed Male Terminal Genitalia of the Tapeworm Paraechinophallus japonicus (Cestoda: Bothriocephalidea)
Céline Levron;
Céline Levron
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. levron@paru.cas.cz
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Larisa G. Poddubnaya;
Larisa G. Poddubnaya
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. levron@paru.cas.cz
* Institute of Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Yaroslavl Province, Russia
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Roman Kuchta;
Roman Kuchta
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. levron@paru.cas.cz
† Also at Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
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Mark Freeman;
Mark Freeman
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. levron@paru.cas.cz
‡ Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, United Kingdom
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Yan-Hai Wang;
Yan-Hai Wang
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. levron@paru.cas.cz
§ Parasitology Research Laboratory, School of Life Sciences, Xiamen University, Xiamen, Fujian, 361005, People's Republic of China
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Tomáš Scholz
Tomáš Scholz
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. levron@paru.cas.cz
† Also at Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
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J Parasitol (2008) 94 (4): 803–810.
Citation
Céline Levron, Larisa G. Poddubnaya, Roman Kuchta, Mark Freeman, Yan-Hai Wang, Tomáš Scholz; Sem and Tem Study of the Armed Male Terminal Genitalia of the Tapeworm Paraechinophallus japonicus (Cestoda: Bothriocephalidea). J Parasitol 1 August 2008; 94 (4): 803–810. doi: https://doi.org/10.1645/GE-1474.1
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