Spermiogenesis in progenetic and adult stages of Archigetes sieboldi Leuckart, 1878, a tapeworm parasitic in oligochaetes and fish respectively, has been examined using transmission electron microscopy and cytochemical staining for glycogen. General pattern of spermiogenesis is essentially like that of other caryophyllideans, i.e., apical dense material in the zone of differentiation in the early stages of spermiogenesis, rotation of free flagellum and a flagellar bud, and proximo-distal fusion. Interestingly, rotation of a free flagellum and flagellar bud to the median cytoplasmic process (MCP) has been observed unconventionally at > 90° only in progenetic stages. Typical striated roots associated with the centrioles occur rarely in A. sieboldi, and only in form of faint structures in advanced stages of spermiogenesis. In contrast to most caryophyllideans studied to date, penetration of the nucleus into the spermatid body has started before the fusion of the free flagellum with the MCP. This feature has been reported rarely but exclusively in the family Caryophyllaeidae. The unipartite mature spermatozoon of A. sieboldi is composed of one axoneme of the 9 + '1' trepaxonematan pattern with its centriole, parallel nucleus, and parallel cortical microtubules which are situated in a moderately electron-dense cytoplasm with glycogen particles. An unusual arrangement of cortical microtubules in the two parallel rows in region I of the spermatozoon is described here for the first time in the Caryophyllidea. Ultrastructural data on spermiogenesis and the spermatozoon in A. sieboldi from tubuficids and carp are compared and discussed with those in other caryophyllideans and/or Neodermata.

1 D Papanin Institute for Biology of Inland Waters Russian Academy of Sciences Borok Yaroslavl Province Russia

Department of Biological Sciences University at Albany State University of New York Albany NY USA

Faculty of Science University of South Bohemia České Budějovice Czech Republic

Institute of Parasitology Biology Centre of the Czech Academy of Sciences České Budějovice Czech Republic

Institute of Parasitology Slovak Academy of Sciences Hlinkova 3 040 01 Košice Slovak Republic

Zobrazit více v PubMed

Int J Parasitol. 1999 Mar;29(3):499-510 PubMed

Parasitol Res. 2001 Aug;87(8):579-88 PubMed

Syst Parasitol. 2002 May;52(1):1-33 PubMed

Z Parasitenkd. 1975 Oct 31;47(4):269-81 PubMed

Parasitol Res. 2003 Jan;89(1):34-43 PubMed

J Parasitol. 1964 Jun;50:454-8 PubMed

Folia Parasitol (Praha). 2003 Dec;50(4):275-92 PubMed

Parasitol Res. 2004 Jun;93(2):114-20 PubMed

Parasitol Res. 2004 Jun;93(2):102-10 PubMed

Parasitol Res. 2004 Dec;94(6):421-6 PubMed

Parasitol Res. 2005 Apr;96(1):38-48 PubMed

Parasitol Res. 2005 Dec;98(1):26-33 PubMed

Parasitol Int. 2006 Jun;55(2):113-20 PubMed

Parasitol Res. 2006 Jun;99(1):37-44 PubMed

Parasitol Res. 2006 Sep;99(4):449-54 PubMed

J Morphol. 2006 Sep;267(9):1110-9 PubMed

Parasitol Res. 2006 Dec;100(1):115-21 PubMed

J Parasitol. 2006 Oct;92(5):884-92 PubMed

J Parasitol. 2007 Dec;93(6):1296-302 PubMed

Parasitol Res. 2008 Sep;103(4):777-85 PubMed

J Parasitol. 2008 Aug;94(4):898-904 PubMed

J Parasitol. 2009 Feb;95(1):1-9 PubMed

Parasitol Res. 2009 Nov;105(6):1603-10 PubMed

Biol Rev Camb Philos Soc. 2010 Aug;85(3):523-43 PubMed

Parasitol Res. 2010 May;106(6):1435-42 PubMed

Parasitol Res. 2011 Apr;108(4):997-1005 PubMed

Parasitol Res. 2011 Jul;109(1):9-18 PubMed

Folia Parasitol (Praha). 2011 Mar;58(1):69-78 PubMed

Parasitol Res. 2012 Jan;110(1):19-30 PubMed

Parasitol Res. 2012 Jan;110(1):141-9 PubMed

J Parasitol. 2012 Apr;98(2):423-30 PubMed

Mol Phylogenet Evol. 2012 Jun;63(3):834-47 PubMed

Parasitol Res. 2012 Sep;111(3):1037-43 PubMed

Parasitol Res. 2012 Nov;111(5):2063-9 PubMed

Folia Parasitol (Praha). 2012 Sep;59(3):179-86 PubMed

Folia Parasitol (Praha). 2013 Feb;60(1):43-50 PubMed

Parasitol Res. 2015 Apr;114(4):1443-53 PubMed

Parasitol Res. 2018 Oct;117(10):3091-3102 PubMed

Z Parasitenkd. 1972;38(1):21-31 PubMed

J Parasitol. 1998 Apr;84(2):385-408 PubMed

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)

Heteromorphism of sperm axonemes in a parasitic flatworm, progenetic Diplocotyle olrikii Krabbe, 1874 (Cestoda, Spathebothriidea)

New data on spermiogenesis and trepaxonematan axoneme in basal tapeworms (Cestoda, Caryophyllidea, Lytocestidae) parasitizing cyprinid fishes