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Spermiogenesis and ultrastructure of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi (Aporhynchidae), a parasite of the velvet belly lanternshark Etmopterus spinax (Elasmobranchii: Etmopteridae).
Folia Parasitol (Praha). 2011 Mar; 58(1):69-78.FP

Abstract

Spermiogenesis and the ultrastructural organisation of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi Noever, Caira, Kuchta et Desjardins, 2010 are described by means of transmission electron microscopy. Type I spermiogenesis of A. menezesi starts with the formation of a differentiation zone containing two centrioles separated by an intercentriolar body constituted by five electron-dense plates. Each centriole gives rise to a free flagellum, which grows at an angle of 90 degrees in relation to a median cytoplasmic process. The nucleus and cortical microtubules elongate along the spermatid body. Later, both flagella rotate and fuse with the median cytoplasmic process. At the final stage of spermiogenesis, the young spermatozoon is detached from the residual cytoplasm by a narrowing of the ring of arched membranes. The mature spermatozoon is a long and filiform cell, tapered at both ends, lacking mitochondria. It is characterized by the presence of two axonemes of the 9+'1' trepaxonematan pattern, the absence of crested bodies, the presence of parallel cortical microtubules and nucleus. This pattern corresponds to the type I spermatozoon of the eucestodes. The anterior extremity of the spermatozoon is characterized by the presence of an arc-like row of up to seven parallel cortical microtubules that partially surrounds the first axoneme. These anterior cortical microtubules are thicker than the posterior microtubules and, consequently, the sperm cell of A. menezesi exhibits two types of cortical microtubules. Another interesting aspect is the presence of alpha-glycogen rosettes. This spermatological pattern is similar to that observed in the spathebothriidean and diphyllobothriidean cestodes.

Authors+Show Affiliations

Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, E-08028 Barcelona, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

21539140

Citation

Marigo, Adji Mama, et al. "Spermiogenesis and Ultrastructure of the Spermatozoon of the Trypanorhynch Cestode Aporhynchus Menezesi (Aporhynchidae), a Parasite of the Velvet Belly Lanternshark Etmopterus Spinax (Elasmobranchii: Etmopteridae)." Folia Parasitologica, vol. 58, no. 1, 2011, pp. 69-78.
Marigo AM, Swiderski Z, Bâ CT, et al. Spermiogenesis and ultrastructure of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi (Aporhynchidae), a parasite of the velvet belly lanternshark Etmopterus spinax (Elasmobranchii: Etmopteridae). Folia Parasitol. 2011;58(1):69-78.
Marigo, A. M., Swiderski, Z., Bâ, C. T., & Miquel, J. (2011). Spermiogenesis and ultrastructure of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi (Aporhynchidae), a parasite of the velvet belly lanternshark Etmopterus spinax (Elasmobranchii: Etmopteridae). Folia Parasitologica, 58(1), 69-78.
Marigo AM, et al. Spermiogenesis and Ultrastructure of the Spermatozoon of the Trypanorhynch Cestode Aporhynchus Menezesi (Aporhynchidae), a Parasite of the Velvet Belly Lanternshark Etmopterus Spinax (Elasmobranchii: Etmopteridae). Folia Parasitol. 2011;58(1):69-78. PubMed PMID: 21539140.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Spermiogenesis and ultrastructure of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi (Aporhynchidae), a parasite of the velvet belly lanternshark Etmopterus spinax (Elasmobranchii: Etmopteridae). AU - Marigo,Adji Mama, AU - Swiderski,Zdzisław, AU - Bâ,Cheikh Tidiane, AU - Miquel,Jordi, PY - 2011/5/5/entrez PY - 2011/5/5/pubmed PY - 2011/6/3/medline SP - 69 EP - 78 JF - Folia parasitologica JO - Folia Parasitol. VL - 58 IS - 1 N2 - Spermiogenesis and the ultrastructural organisation of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi Noever, Caira, Kuchta et Desjardins, 2010 are described by means of transmission electron microscopy. Type I spermiogenesis of A. menezesi starts with the formation of a differentiation zone containing two centrioles separated by an intercentriolar body constituted by five electron-dense plates. Each centriole gives rise to a free flagellum, which grows at an angle of 90 degrees in relation to a median cytoplasmic process. The nucleus and cortical microtubules elongate along the spermatid body. Later, both flagella rotate and fuse with the median cytoplasmic process. At the final stage of spermiogenesis, the young spermatozoon is detached from the residual cytoplasm by a narrowing of the ring of arched membranes. The mature spermatozoon is a long and filiform cell, tapered at both ends, lacking mitochondria. It is characterized by the presence of two axonemes of the 9+'1' trepaxonematan pattern, the absence of crested bodies, the presence of parallel cortical microtubules and nucleus. This pattern corresponds to the type I spermatozoon of the eucestodes. The anterior extremity of the spermatozoon is characterized by the presence of an arc-like row of up to seven parallel cortical microtubules that partially surrounds the first axoneme. These anterior cortical microtubules are thicker than the posterior microtubules and, consequently, the sperm cell of A. menezesi exhibits two types of cortical microtubules. Another interesting aspect is the presence of alpha-glycogen rosettes. This spermatological pattern is similar to that observed in the spathebothriidean and diphyllobothriidean cestodes. SN - 0015-5683 UR - https://www.unboundmedicine.com/medline/citation/21539140/Spermiogenesis_and_ultrastructure_of_the_spermatozoon_of_the_trypanorhynch_cestode_Aporhynchus_menezesi__Aporhynchidae__a_parasite_of_the_velvet_belly_lanternshark_Etmopterus_spinax__Elasmobranchii:_Etmopteridae__ L2 - http://folia.paru.cas.cz/link/2011/1/69.html DB - PRIME DP - Unbound Medicine ER -