The ultrastructure of the spermatozoon of Neochasmus sp. (Cryptogonimidae, Digenea, Trematoda) and its phylogenetic significance

Jamieson, B. G. M.; Daddow, L.

doi:10.1016/0020-7519(82)90051-0

Cited by 64 publications

(47 citation statements)

References 28 publications

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“…The spermatozoon of C. endopapillatus has ultrastructural characteristics which are similar to those of the majority of the digenean: two axonemes of the type 9 + '1' pattern characteristic of the Trepaxonemata (Ehlers 1984), a nucleus, one or two mitochondria and cortical microtubules (Burton 1972;Jamieson and Daddow 1982;Orido 1988;Stitt and Fairweather 1990;Levron et al 2003Levron et al , 2004aNdiaye et al 2003a, b;Seck et al 2007). In Trepaxonemata, only Schistosomatidae and Didymozoidae have flagella with 9 + 0 axonemes considered as a variant of the classic 9 + '1' pattern.…”

Section: Discussionmentioning

confidence: 93%

Spermiogenesis and sperm ultrastructure of Carmyerius endopapillatus (Digenea, Gastrothylacidae), a parasite of Bos taurus in Senegal

Seck

Marchand

Bâ

2008

Acta Parasitologica

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Ultrastructural study of spermiogenesis and of the spermatozoon of Carmyerius endopapillatus has enabled to describe some characteristics of this digenea. The intercentriolar body situated between the two striated roots and the two centrioles, presents a symmetric organization. Both external bands of this intercentriolar body are made up of a row of granules. During spermiogenesis, a flagellar rotation of 90° is described. The old spermatid does not present external ornamentations. The spermatozoon is characterized, in its anterior region, by the presence of a lateral expansion exhibiting one spinelike body. In C. endopapillatus, external ornamentations are localized only at the level where the lateral expansion appears. The posterior extremity of spermatozoon exhibits a nucleus surrounded by a plasmic membrane lacking microtubules, but presenting a small lateral expansion. This is the first species of Gastrothylacidae family studied by transmission electron microscopy.

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Section: Discussionmentioning

confidence: 93%

Spermiogenesis and sperm ultrastructure of Carmyerius endopapillatus (Digenea, Gastrothylacidae), a parasite of Bos taurus in Senegal

Seck

Marchand

Bâ

2008

Acta Parasitologica

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“…In fact, although a single mitochondrion was generally observed in many species of Digenea (Table 1), the presence of several mitochondria had already been reported for digeneans such as D. dendriticum (Morseth 1969;Cifrian et al 1993), Haematoloechus medioplexus (Burton 1972), Pharyngostomoides procyonis (Grant et al 1976), Cryptocotyle lingua (Rees 1979), Paragonimus ohirai (Fujino et al 1977;Orido 1988), Neochasmus sp. (Jamieson and Daddow 1982), Maritrema linguilla (Hendow and James 1988), F. hepatica (Stitt and Fairweather 1990), P. gymnesicus (Gracenea et al 1997), N. neyrai (Ndiaye et al 2003b), and M. parvus ). However, they had never been observed in a parallel position.…”

Section: Spermatozoonmentioning

confidence: 97%

Dicrocoelium hospes Looss, 1907 (Digenea, Dicrocoeliidae): spermiogenesis, mature spermatozoon and ultrastructural comparative study

et al. 2005

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This work describes the first ultrastructural results on spermiogenesis and on the mature spermatozoon of Dicrocoelium hospes (Trematoda, Digenea) collected in Bos indicus from Senegal (Africa). Examination of this species was processed by TEM. Spermiogenesis follows the general pattern found in the digenean, but reveals a particularity consisting of the appearance of glycogen granules in the late spermatids within the testes. The mature spermatozoon possesses five distinct regions and presents all features found in Digenea gametes: two axonemes, mitochondria, nucleus and parallel cortical microtubules. However, several characters allow us to distinguish D. hospes from other digenetic trematodes within the Dicrocoeliidae family. In fact, we observed several structures that are absent in the other species of Dicrocoeliidae studied until now, such as: a cytoplasmic expansion, extramembranar ornamentation, spine-like bodies and two parallel mitochondria in the mature sperm. Moreover, additional particular characteristics were observed in this species in both extremities of the spermatozoon. This work produced new data on the ultrastructure of this trematode family which may be useful for phylogenetic purposes.

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“…The spermiogenesis process and spermatozoon organization of M. parvus match the general pattern found in the Trepaxonemata: the spermatozoon, long and filiform, contains two 9+''1'' axonemes (Justine and Mattei 1981Mattei , 1982aMattei , 1982bJamieson and Daddow 1982;Robinson and Halton 1982;Ehlers 1984).…”

Section: Introductionmentioning

confidence: 93%

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

Levron

Ternengo

Marchand

2004

Parasitology Research

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The present paper describes the characteristic ultrastructural features of spermiogenesis and the spermatozoon of Monorchis parvus (Trematoda, Digenea, Monorchiidae). This spermiogenesis is characterized by a flagellar rotation of about 120 degrees and the formation of a novel ultrastructural element: a centriolar extension. It nevertheless follows the general pattern of digeneans. It begins with the formation of a differentiation zone, comprising striated rootlets associated with two centrioles and an intercentriolar body. The mature spermatozoon presents features allowing the distinction between M. parvus and other digenetic trematodes. It possesses an original anterior extremity. The two central elements of the axonemes appear prior to the peripheral doublets. The external ornamentations of the cell membrane are formed parallel to the central elements. Another peculiarity of the male gamete is the presence of two mitochondria. M. parvus, therefore, differs distinctly from other digenetic trematodes.

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The ultrastructure of the spermatozoon of Neochasmus sp. (Cryptogonimidae, Digenea, Trematoda) and its phylogenetic significance

Cited by 64 publications

References 28 publications

Spermiogenesis and sperm ultrastructure of Carmyerius endopapillatus (Digenea, Gastrothylacidae), a parasite of Bos taurus in Senegal

Spermiogenesis and sperm ultrastructure of Carmyerius endopapillatus (Digenea, Gastrothylacidae), a parasite of Bos taurus in Senegal

Dicrocoelium hospes Looss, 1907 (Digenea, Dicrocoeliidae): spermiogenesis, mature spermatozoon and ultrastructural comparative study

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

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