<i>Neomultitestis aspidogastriformis</i>  Bray and Cribb, 2003 (Digenea, Lepocreadiidae): mature spermatozoon and sperm morphologies in the Lepocreadioidea

Bakhoum, Abdoulaye J.S.; Quilichini, Yann; Justine, Jean‐Lou; Bray, Rodney A.; Bâ, Cheikh Tidiane; Marchand, Bernard

doi:10.1002/cbin.10449

Cited by 14 publications

(20 citation statements)

References 41 publications

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“…The ultrastructural organization of the mature spermatozoon of A. sigani is in agreement with that reported for most digenean species with the presence of two axonemes of the 9 + “1” pattern of trepaxonematans [ 17 ], nucleus, mitochondria, an association between external ornamentation of the plasma membrane and cortical microtubules, two bundles of parallel cortical microtubules generally arranged in the middle area of the spermatozoon and granules of glycogen irregularly distributed [ 3 , 7 , 16 , 26 , 29 , 38 , 40 , 49 ].…”

Section: Discussionsupporting

confidence: 86%

“…presence of external ornamentation in the distal part of the anterior spermatozoon, associated with the anterior mitochondrion. Mature spermatozoa with type 2 external ornamentation have also been described so far in other digenean species [ 4 , 7 , 15 , 24 , 30 , 35 ].…”

Section: Discussionmentioning

confidence: 83%

“…Compared to the lepocreadioid spermatozoa reported so far, the appearance of cortical microtubules is also noted only when both axonemes are completely formed [ 7 , 30 ]. However, in the mature spermatozoon of A. sigani the submembranous electron-dense material is still observed when cortical microtubules appear and in the ornamented region.…”

Section: Discussionmentioning

confidence: 98%

“…The anterior extremity of the male gamete of A. sigani is characterized by the presence of one axoneme (observed in longitudinal section) and a submembranous electron-dense material. In Digenea, mature spermatozoa exhibiting one axoneme in their anterior extremity are frequent and reported in several families such as the Cryptogonimidae [ 18 , 38 , 46 ], Gyliauchenidae [ 9 , 40 ], Lepocreadiidae [ 7 , 23 , 30 ], Opisthorchiidae [ 49 ] or Plagiorchiidae [ 32 , 34 ]. Besides the presence of one axoneme, the anterior part of the mature spermatozoon of A. sigani also contains submembranous electron-dense material.…”

Section: Discussionmentioning

confidence: 99%

“…This is the case in Holorchis micracanthum (Aephnidiogenidae), Gyliauchen sp. and Robphildollfusium fratum (Gyliauchenidae), Hypocreadium caputvadum , Neomultitestis aspidogastriformis and Opechona bacillaris (Lepocreadiidae) [ 2 , 7 , 9 , 23 , 30 , 35 , 40 ].…”

Section: Discussionmentioning

confidence: 99%

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First spermatological study in the Atractotrematidae (Digenea, Haploporoidea): the case ofAtractotrema sigani, intestinal parasite ofSiganus lineatus

et al. 2015

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The ultrastructural organization of the mature spermatozoon of the digenean Atractotrema sigani (from Siganus lineatus off New Caledonia) was investigated by transmission electron microscopy. The male gamete of A. sigani exhibits the general morphology described in digeneans with the presence of two axonemes of different lengths showing the 9 + “1” pattern of the Trepaxonemata, a nucleus, two mitochondria, two bundles of parallel cortical microtubules, external ornamentation, spine-like bodies and granules of glycogen. However, the mature spermatozoon of A. sigani has some specific characters such as the morphology of its anterior region and the submembranous electron-dense material. Although similar structures have been reported in some digenean species, the presence of a submembranous electron-dense material describing a complete ring is reported here for the first time in the mature spermatozoon of A. sigani. In addition, sperm characteristics are compared between the Haploporoidea and their supposed close superfamilies, and possible phylogenetic implications of these findings for the Digenea are discussed.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

First spermatological study in the Atractotrematidae (Digenea, Haploporoidea): the case ofAtractotrema sigani, intestinal parasite ofSiganus lineatus

et al. 2015

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Ultrastructural description of the spermatogenesis and spermatozoa in Phaenocora unipunctata (Platyhelminthes, Neotyphloplanida)

León

Volonterio

2018

Journal of Morphology

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Ultrastructural studies of spermiogenesis and sperm morphology have found many characters that are likely to provide clues to the phylogeny of the Platyhelminthes. However, the lack of information on many free-living groups has been a limiting factor. There is a single description of the spermatogenesis and spermatozoa in a Phaenocora species, namely P. anomalocoela, therefore a similar analysis was made in Phaenocora unipunctata to compare the intrageneric variation of sperm ultrastructure and spermatogenesis in the Neotyphloplanida. The comparison of the two Phaenocora species shows that several characters have the potential to be relevant to hypothesize phylogenetic relationships at different taxonomic levels. The presence of superficially incorporated axonemes outside the ring of cortical microtubules in the mature sperm cell, resulting from the fusion of the axonemes with the median cytoplasmic process during spermiogenesis, as well as the presence of a constant number of microtubules in the different regions of the spermatozoon, seem to constitute apomorphies of the genus Phaenocora. Furthermore, the presence of an axonemal spur, the compression of cortical microtubules by the rotation of the basal bodies during spermiogenesis, and the presence of a connection between the nucleus and the plasma membrane in the mature spermatozoon, support previous proposals that these characters are apomorphies of Dalytyphloplanida. The comparison of spermatogenesis and spermatozoa of P. unipunctata and P. anomalocoela demonstrates that studying intrageneric variation can give valuable insights into the significance of many characters proposed for phylogenetic studies of the Rhabdocoela.

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Ultrastructural characters of the spermatozoa in Digeneans of the genus Bianium Stunkard, 1930 (Digenea, Lepocreadiidae) parasites of fishes: a comparative study of Bianium plicitum and Bianium arabicum

et al. 2015

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We present in this paper the first ultrastructural study of the spermatozoon of species of the genus Bianium Stunkard, 1930, namely Bianium plicitum and Bianium arabicum belonging to the family Lepocreadiidae. Specimens are parasites of the tetraodontid teleosts Lagocephalus laevigatus caught in the Atlantic Ocean and Lagocephalus sceleratus caught in Pacific Ocean, respectively. Live worms were fixed and processed for transmission electron microscopy. Observations of numerous cross and longitudinal sections of the spermatozoa of B. plicitum and B. arabicum demonstrated the general pattern described in all previously studied Lepocreadioidea, namely two axonemes with 9+ "1" pattern of Trepaxonemata, two mitochondria, a nucleus, parallel cortical microtubules, and an external ornamentation of the plasma membrane associated with spine-like bodies. The maximum number of cortical microtubules and the external ornamentation were not located at the anterior extremity of the spermatozoon but at a more posterior level, as in all the species of Lepocreadioidea studied to date. Differences observed between spermatozoa of B. plicitum and B. arabicum were observed in: (1) the location of the first mitochondrion, (2) size of cortical microtubules which were longer in B. arabicum than in B. plicitum, and (3) the order of the disappearance of the axonemes, mitochondrion, and cortical microtubules toward the posterior region of the spermatozoon. Only the nucleus reaches into the posterior extremity of the spermatozoon in these two species. The general pattern of the spermatozoon described in these two species exhibit the general model in the genus Bianium.

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Neomultitestis aspidogastriformis Bray and Cribb, 2003 (Digenea, Lepocreadiidae): mature spermatozoon and sperm morphologies in the Lepocreadioidea

Cited by 14 publications

References 41 publications

First spermatological study in the Atractotrematidae (Digenea, Haploporoidea): the case ofAtractotrema sigani, intestinal parasite ofSiganus lineatus

First spermatological study in the Atractotrematidae (Digenea, Haploporoidea): the case ofAtractotrema sigani, intestinal parasite ofSiganus lineatus

Ultrastructural description of the spermatogenesis and spermatozoa in Phaenocora unipunctata (Platyhelminthes, Neotyphloplanida)

Ultrastructural characters of the spermatozoa in Digeneans of the genus Bianium Stunkard, 1930 (Digenea, Lepocreadiidae) parasites of fishes: a comparative study of Bianium plicitum and Bianium arabicum

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