<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The mature spermatozoon of <italic>Khawia armeniaca</italic>, a monozoic caryophyllidean parasite of templar fish <italic>Capoeta capoeta sevangi</italic> (De Filippi, 1865) from the Lake Sevan, Armenia, has been studied using transmission electron microscopy and cytochemical technique of <xref ref-type="bibr" rid="j_helm-2020-0040_ref_039">Thiéry (1967)</xref> for the first time. The mature spermatozoon of <italic>K. armeniaca</italic> consists of a single axoneme with the 9+‘1’ trepaxonematan structure, cortical microtubules and nucleus which are situated parallel to the longitudinal axis of the spermatozoon, and a moderately electrondense cytoplasm with glycogen particles. The cortical microtubules are arranged in one continuous semicircle beneath the plasma membrane in Region II and anterior part of Region III of the mature spermatozoon. The two opposite rows of cortical microtubules are observed in the remaining nuclear and at the beginning of the postnuclear part (Regions III, IV) of the male gamete The number of cortical microtubules is remarkably variable in the spermatozoa of various <italic>Khawia</italic> species. <italic>K. armeniaca</italic> exhibits the highest number of cortical microtubules in comparison with <italic>K. sinensis</italic> and <italic>K. rossittensis</italic>. Glycogen was detected in the cytoplasm of prenuclear (II), nuclear (III) and postnuclear (IV) regions with different ultrastructural organization of the mature spermatozoon of <italic>K. armeniaca</italic>. Variations of sperm ultrastructural characters within caryophyllideans and other cestodes are discussed.</p></abstract>

The mature spermatozoon of Khawia armeniaca, a monozoic caryophyllidean parasite of templar fish Capoeta capoeta sevangi (De Filippi, 1865) from the Lake Sevan, Armenia, has been studied using transmission electron microscopy and cytochemical technique of Thiéry (1967) for the first time. The mature spermatozoon of K. armeniaca consists of a single axoneme with the 9+‘1’ trepaxonematan structure, cortical microtubules and nucleus which are situated parallel to the longitudinal axis of the spermatozoon, and a moderately electrondense cytoplasm with glycogen particles. The cortical microtubules are arranged in one continuous semicircle beneath the plasma membrane in Region II and anterior part of Region III of the mature spermatozoon. The two opposite rows of cortical microtubules are observed in the remaining nuclear and at the beginning of the postnuclear part (Regions III, IV) of the male gamete The number of cortical microtubules is remarkably variable in the spermatozoa of various Khawia species. K. armeniaca exhibits the highest number of cortical microtubules in comparison with K. sinensis and K. rossittensis. Glycogen was detected in the cytoplasm of prenuclear (II), nuclear (III) and postnuclear (IV) regions with different ultrastructural organization of the mature spermatozoon of K. armeniaca. Variations of sperm ultrastructural characters within caryophyllideans and other cestodes are discussed.

Ultrastructure and cytochemistry of the mature spermatozoon of <italic>Khawia armeniaca</italic> (Cholodkovsky, 1915) (Caryophyllidea: Lytocestidae), a parasite of <italic>Capoeta capoeta sevangi</italic> (De Filippi, 1865) (Teleostei, Cyprinidae)

Helminthologia

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Ultrastructure and cytochemistry of the mature spermatozoon of  (Cholodkovsky, 1915) (Caryophyllidea: Lytocestidae), a parasite of  (De Filippi, 1865) (Teleostei, Cyprinidae)

The mature spermatozoon of Khawia armeniaca, a monozoic caryophyllidean parasite of templar fish Capoeta capoeta sevangi (De Filippi, 1865) from the Lake...

Ultrastructure and cytochemistry of the mature spermatozoon of Khawia armeniaca (Cholodkovsky, 1915) (Caryophyllidea: Lytocestidae), a parasite of Capoeta capoeta sevangi (De Filippi, 1865) (Teleostei, Cyprinidae)

Article Category: Research Article

Published Online: Nov 19, 2020

Page range: 353 - 360

Received: Feb 05, 2020

Accepted: Jul 09, 2020

DOI: https://doi.org/10.2478/helm-2020-0040

Keywords
Cestoda, Caryophyllidea, spermatozoon, ultrastructure

© 2020 M. Matoušková, M. Bruňanská, J. Nebesářová, L. G. Poddubnaya, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Ultrastructure and cytochemistry of the mature spermatozoon of Khawia armeniaca (Cholodkovsky, 1915) (Caryophyllidea: Lytocestidae), a parasite of Capoeta capoeta sevangi (De Filippi, 1865) (Teleostei, Cyprinidae)

Article Category: Research Article

Published Online: Nov 19, 2020

Page range: 353 - 360

Received: Feb 05, 2020

Accepted: Jul 09, 2020

DOI: https://doi.org/10.2478/helm-2020-0040

KeywordsCestoda, Caryophyllidea, spermatozoon, ultrastructure

© 2020 M. Matoušková, M. Bruňanská, J. Nebesářová, L. G. Poddubnaya, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Cestoda, Caryophyllidea, spermatozoon, ultrastructure