Ultrastructure of spermiogenesis and mature spermatozoon of Skrjabinoporus merops (Cyclophyllidea, Metadilepididae)

Yoneva, Aneta; Georgieva, K.; Mizinska, Y.; Georgiev, Boyko B.; Stoitsova, Stoyanka

doi:10.2478/s11686-006-0031-7

Cited by 14 publications

(36 citation statements)

References 31 publications

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“…However, both Skrjabinoporus merops (Metadilepididae) and the species of the Dipylidiidae are characterised by the Type III spermiogenesis (Miquel et al 1998(Miquel et al , 2005aNdiaye et al 2003b;Yoneva et al 2006). The record of the Type IV spermiogenesis in a dilepidid species provides an additional support of considering Metadilepididae and Dipylidiidae as distinct families as suggested by Jones et al (1994).…”

Section: Spermiogenesismentioning

confidence: 53%

“…However, the implementation of spermiological characters in phylogenetic analyses of cyclophyllideans is currently not possible because the information is unevenly distributed. The cyclophyllidean species studied belong to 9 families only (recently surveyed by Yoneva et al 2006). Therefore, accumulation of ultrastructural data on the spermiogenesis and mature spermatozoa of representatives of the cyclophyllidean families is urgently needed.…”

Section: Introductionmentioning

confidence: 99%

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Ultrastructure of spermiogenesis and mature spermatozoon of Angularella beema (Clerc, 1906) (Cestoda, Cyclophyllidea, Dilepididae)

Yoneva

Miquel

Świderski³

et al. 2006

Acta Parasitologica

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The ultrastructure of the spermiogenesis of a dilepidid cestode species is described for the first time. The spermiogenesis of Angularella beema is characterised by absence of both flagellar rotation and proximodistal fusion. The differentiation zone is surrounded by cortical microtubules and is delimited by a ring of arching membranes. It contains two centrioles, one of which develops the axoneme that grows directly into the elongating cytoplasmic protrusion. This pattern of spermiogenesis was described as the Type IV spermiogenesis of cestodes. Among cestodes, similar pattern of spermiogenesis is known in the family Hymenolepididae and in some representatives of the family Anoplocephalidae. The mature spermatozoon of A. beema consists of five regions differing in their ultrastructural characteristics. It is characterised by the presence of cortical microtubules (spirally arranged at angle of 30-40° to the spermatozoon axis) and a single crested body. There is a periaxonemal sheath in certain parts of the spermatozoon as well as glycogen-like granules between the periaxonemal sheath and the cortical microtubules. The comparisons of the mature spermatozoon of A. beema with those of other two dilepidid species (Dilepis undula and Molluscotaenia crassiscolex) demonstrate some variation within the family: presence of periaxonemal sheath in A. beema and D. undula and its absence in M. crassiscolex; presence of electron-dense rods in D. undula and their absence in A. beema.

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Section: Spermiogenesismentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Ultrastructure of spermiogenesis and mature spermatozoon of Angularella beema (Clerc, 1906) (Cestoda, Cyclophyllidea, Dilepididae)

Yoneva

Miquel

Świderski³

et al. 2006

Acta Parasitologica

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“…Four cyclophyllideans, the catenotaeniid C. pusilla, the metadilepidid S. merops, the paruterinid A. globata and the taeniid T. parva show a flagellar rotation inferior to 90°before the proximodistal fusion of the free flagellum with the cytoplasmic extension Ndiaye et al 2003a); Yoneva et al 2006bYoneva et al , 2009. This is also the case for T. taeniaeformis.…”

Section: Spermiogenesismentioning

confidence: 70%

“…In order to increase homogeneity, Miquel et al (2005a) has proposed to group all the previously described "non-typical striated rootlets" under the common designation of "vestigial striated rootlets". Later, similar structures were described in the metadilepidid Skrjabinoporus merops and in the paruterinid Anonchotaenia globata (Yoneva et al 2006b(Yoneva et al , 2009). In the present study, vestigial striated rootlets associated with the centrioles are also observed in the differentiation zone of T. taeniaeformis.…”

Section: Spermiogenesismentioning

confidence: 72%

“…This is the case of the catenotaeniid Catenotaenia pusilla, the davaineids, the dipylidiids, the metadilepidid Skrjabinoporus merops, the nematotaeniid Nematotaenia chantalae, and the taeniids (Featherston 1971;Mokhtar-Maamouri and Azzouz-Draoui 1990;Bâ and Marchand 1994b;Miquel et al , 2005bMiquel et al , 2009bHidalgo et al 2000;Ndiaye et al 2003a, b;Willms et al 2003Willms et al , 2004Yoneva et al 2006b). In the present study, we demonstrate that T. taeniaeformis also exhibits Type 3 spermiogenesis.…”

Section: Spermiogenesismentioning

confidence: 99%

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Ultrastructure of spermatogenesis of Taenia taeniaeformis (Batsch, 1786) (Cestoda, Cyclophyllidea, Taeniidae) and comparison of spermatological characters in the family Taeniidae Ludwig, 1886

Miquel

Świderski²,

Foronda³

et al. 2009

Acta Parasitologica

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The ultrastructure of spermatogenesis of Taenia taeniaeformis is described for the first time by means of transmission electron microscopy (TEM). Mature testes contain all stages of spermatogenesis; primary spermatogonia are usually situated at the periphery and mature spermatozoa in the centre of testes. The general process is similar to that described in other cestodes. Six incomplete, synchronic cytokineses occur: four mitotic and two meiotic cell divisions. All these divisions occur simultaneously, resulting in a rosette cluster of four tertiary spermatogonia, then eight quaternary spermatogonia, and subsequently sixteen primary spermatocytes. All of these enter into a growth period and their enlarged nuclei move to the periphery of cells of the rosettes. The first meiotic division forms thirty-two secondary spermatocytes and after the second meiotic division, there are sixty-four spermatids. Spermiogenesis in T. taeniaeformis corresponds to the Bâ and Marchand's Type 3 and begins with the formation of a differentiation zone in the form of a conical projection of cytoplasm delimited by a ring of arching membranes and surrounded by submembranous cortical microtubules. Within this area, there are two centrioles, orthogonally disposed, and vestigial striated rootlets. Only one of the centrioles develops a flagellum that grows externally to the cytoplasmic extension. Posteriorly, a flagellar rotation inferior to 90º occurs and the flagellum becomes parallel to the cytoplasmic extension. Later, the two processes fuse during the so-called proximodistal fusion. The nucleus elongates and moves into the cytoplasmic extension. In the final stage of spermiogenesis, a single crested body appears at the base of the differentiating spermatozoon. Finally, the ring of arching membranes constricts and the young spermatozoon detaches from the residual cytoplasm. Ultrastructural aspects of spermatogenesis are compared with that of other cestodes studied to date, particularly of the family Taeniidae.

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Spermiogenesis and sperm ultrastructure of Valipora mutabilis Linton, 1927 (Cestoda, Cyclophyllidea, Gryporhynchidae)

et al. 2008

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This is the first ultrastructural study of the spermiogenesis and the mature spermatozoon of a cyclophyllidean cestode of the family Gryporhynchidae. The spermiogenesis of Valipora mutabilis begins with the formation of a differentiation zone delimited by arching membranes and containing two centrioles. One of the centrioles develops an axoneme that grows directly into the cytoplasmic protrusion. The other centriole remains situated in a cytoplasmic bud and is subsequently aborted (type IV of cestode spermiogenesis). The mature spermatozoon of V. mutabilis is a filiform cell, tapered at both extremities and lacks mitochondria. The anterior extremity is characterised by the presence of an apical cone and a single helicoidal crested body. The axoneme is of 9 + '1' trepaxonematan pattern, with a periaxonemal sheath. The cortical microtubules are twisted at an angle of about 45 degrees to the spermatozoon axis. The nucleus is electron dense and spirally coiled around the axoneme. The cytoplasm is electron lucent and contains numerous granules of electron-dense material. In contrast to a recent opinion for close phylogenetic relationships, these ultrastructural data demonstrate the distant position between gryporhynchids and the family Taeniidae. The most similar pattern in the ultrastructure of the spermiogenesis and the mature spermatozoon has been described for dilepidids, some hymenolepidids and some anoplocephalids.

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Ultrastructure of spermiogenesis and mature spermatozoon of Skrjabinoporus merops (Cyclophyllidea, Metadilepididae)

Cited by 14 publications

References 31 publications

Ultrastructure of spermiogenesis and mature spermatozoon of Angularella beema (Clerc, 1906) (Cestoda, Cyclophyllidea, Dilepididae)

Ultrastructure of spermiogenesis and mature spermatozoon of Angularella beema (Clerc, 1906) (Cestoda, Cyclophyllidea, Dilepididae)

Ultrastructure of spermatogenesis of Taenia taeniaeformis (Batsch, 1786) (Cestoda, Cyclophyllidea, Taeniidae) and comparison of spermatological characters in the family Taeniidae Ludwig, 1886

Spermiogenesis and sperm ultrastructure of Valipora mutabilis Linton, 1927 (Cestoda, Cyclophyllidea, Gryporhynchidae)

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