Etude des spermatozoides d'Hirudinees l'Aide de la Technique de Coloration Negative

Wissocq, Jean-Claude; Malecha, Jean

doi:10.1016/s0022-5320(75)80074-8

Cited by 23 publications

(12 citation statements)

References 10 publications

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“…D. lineata and H. medicinalis Wissocq and Malécha (1975) had a double helix nucleus. On the other hand, the nucleus in erpobdellids had two recognizable areas, which are determined by the nature of the helical thickenings (Garavaglia et al, 1974;Wissocq and Malécha, 1975;. In H. medicinalis, Wissocq and Malécha (1975) described three successive sections in the nucleus (basal, median and anterior), which are based on morphological variations in the nucleus, while Garavaglia et al (1974) described only two sections in the sperm nucleus in the same species.…”

Section: Nucleus and Microtubulesmentioning

confidence: 99%

“…The anterior acrosome is absent in all other Clitellata and is regarded as an autapomorphy of true leeches (Hirudinida = Euhirudinea) (Ferraguti and Erséus, 1999). This structure is always corkscrewshaped and apparently prolongs the acrosome tube, which is decorated by a helical ridge «bourrelet hélicoidal» (Wissocq and Malécha, 1975). This latter is present in some oligocheates and branchiobdellids (Ferraguti, 2000).…”

Section: Acrosomementioning

confidence: 99%

“…An acrosomal rod is, however, clearly present in the African medicinal leech H. troctina. Moreover, this structure is present in some oligocheates (Wissocq and Malécha, 1975;Ferraguti, 2000) and branchiobdellidans (Ferraguti, 2000).…”

Section: Acrosomementioning

confidence: 99%

“…A trilobed twisted nucleus was found in both H. stagnalis and S. delicata (Gouda, 2013) as well as in the piscicolid leech P. geometra (Malécha, 1975). The nuclear region in G. complanata was observed to be a highly twisted thread of variable thicknesses (Wissocq and Malécha, 1975), which was formed by a single twisted fiber (Damas, 1968). D. lineata and H. medicinalis Wissocq and Malécha (1975) had a double helix nucleus.…”

Section: Nucleus and Microtubulesmentioning

confidence: 99%

“…The nuclear region in G. complanata was observed to be a highly twisted thread of variable thicknesses (Wissocq and Malécha, 1975), which was formed by a single twisted fiber (Damas, 1968). D. lineata and H. medicinalis Wissocq and Malécha (1975) had a double helix nucleus. On the other hand, the nucleus in erpobdellids had two recognizable areas, which are determined by the nature of the helical thickenings (Garavaglia et al, 1974;Wissocq and Malécha, 1975;.…”

Section: Nucleus and Microtubulesmentioning

confidence: 99%

See 4 more Smart Citations

Ultrastructural study of spermatogenesis and sperm in the African medicinal leech Hirudo troctina Johnson, 1816 (Annelida, Hirudinida)

Ahmed¹,

Tekaya²,

Urbisz

et al. 2015

Tissue and Cell

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Section: Nucleus and Microtubulesmentioning

confidence: 99%

Section: Acrosomementioning

confidence: 99%

Section: Acrosomementioning

confidence: 99%

Section: Nucleus and Microtubulesmentioning

confidence: 99%

Section: Nucleus and Microtubulesmentioning

confidence: 99%

See 3 more Smart Citations

Ultrastructural study of spermatogenesis and sperm in the African medicinal leech Hirudo troctina Johnson, 1816 (Annelida, Hirudinida)

Ahmed¹,

Tekaya²,

Urbisz

et al. 2015

Tissue and Cell

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Giant spermatozoon coiled in small egg: Fertilization mechanisms and their implications for evolutionary studies on ostracoda (crustacea)

Matzke‐Karasz

2005

J. Exp. Zool.

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Ostracods of the superfamily Cypridoidea have giant spermatozoa. However, little data exist on the sperm-egg interaction in this group: only two publications have so far given the most ambiguous indication that the entire sperm enters the egg on fertilization. These assumptions have not yet been tested with modern techniques, nor has their putative value for developmental and evolutionary investigations been realized. The present paper gives the first, clear, light- and scanning electron microscopical evidence of the entire giant ostracod spermatozoon being incorporated into the egg. Coiling of the sperm underneath the egg shell is shown in the early zygotes of the species Mytilocypris praenuncia and Pseudocandona marchica. Additionally, data on the morphology of female and male reproductive tracts are given for M. praenuncia. Hypotheses on the evolution of giant filiform sperm in the Animal Kingdom are reviewed, and their applicability to ostracods is discussed. The demonstrated ingression of the entire sperm implies the entry of the two giant paternal mitochondrial derivates into the zygote in Cypridoidea and potentially casts doubt upon the dogma of strict maternal inheritance of mitochondrial DNA. Evidence of paternal inheritance of mtDNA in several organisms has recently given rise to a controversial debate on this issue; the possible significance of this phenomenon for molecular studies on ostracod phylogeny and evolution is discussed.

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Ultrastructural investigation of spermiogenesis in Peripatopsis capensis (Onychophora)

Camatini¹,

Franchi²,

Saita³

1979

Journal of Morphology

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Early spermatids of the onychophoran Peripatopsis capensis are spherical cells with a centrally located nucleus, numerous mitochondria, Golgi complexes, microtubules and two centrioles. During spermiogenesis, Golgi vesicles migrate to one side of the cell where they form a tight aggregate, which is later shed. The mature spermatozoon has no acrosome. Several mitochondria fuse to form a middle piece containing three large mitochondria. Nucleus and middle-piece elongate, presumably under the influence of helically twisted microtubules. Outside this set of microtubules a continuous layer of endoplasmic reticulum cisternae is formed which separates the interior portion of the cell from an external cytoplasmic rim, which is later shed. Outside the 9 + 2 complex, the tail presents nine accessory microtubules, and a peripheral layer of microtubules beneath the plasma membrane. The enforcement of the tail structure may be related to the fertilization biology of this animal, which is by "hypodermal" impregnation.

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Etude des spermatozoides d'Hirudinees l'Aide de la Technique de Coloration Negative

Cited by 23 publications

References 10 publications

Ultrastructural study of spermatogenesis and sperm in the African medicinal leech Hirudo troctina Johnson, 1816 (Annelida, Hirudinida)

Ultrastructural study of spermatogenesis and sperm in the African medicinal leech Hirudo troctina Johnson, 1816 (Annelida, Hirudinida)

Giant spermatozoon coiled in small egg: Fertilization mechanisms and their implications for evolutionary studies on ostracoda (crustacea)

Ultrastructural investigation of spermiogenesis in Peripatopsis capensis (Onychophora)

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