An ultrastructural study of the ovary cord organization and oogenesis in Erpobdella johanssoni (Annelida, Clitellata: Hirudinida)

Ahmed, Raja Ben; Tekaya, Saïda; Małota, Karol; Świątek, Piotr

doi:10.1016/j.micron.2012.07.005

Cited by 14 publications

(28 citation statements)

References 53 publications

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“…Cytochemical and microscopic methods were used as described elsewhere (Świątek, ,b, , ; Świątek et al., , , ,b, ; Spałek‐Wołczyńska et al., ; Ben Ahmed et al., , ; Urbisz et al., ). All specimens were fixed with 2.5% glutaraldehyde in 0.1 m phosphate buffer (pH 7.4), then dissected.…”

Section: Methodsmentioning

confidence: 99%

“…The characters were adopted from Ben Ahmed et al. (, ), Brumpt (), Gruzova and Zaichikova (), Epstein (, ), Elliott and Mann (), Sawyer (), Gruzova and Parfenov (), Siddall and Burreson (), Bielecki (, ), Apakupakul et al. (), Siekierska (), Świątek (,b, , ), Siddall et al.…”

Section: Methodsmentioning

confidence: 99%

“…a) [Note: in Hirudinida and Acanthobdellida ovaries are composed from an external envelope (ovarian sac=ovisac) that is filled with hemocelomic fluid in which several freely floating internal structures occur. These internal ovarian units may have the form of long or short ovary cords (ovary strings) or spherical egg follicles (for details see: Świątek, ,b, , ; Ben Ahmed et al., , ; Świątek et al., , ). ] Ovary, polarization of the internal ovarian units: (0) present (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…] Ovary, polarization of the internal ovarian units: (0) present (Fig. c,d); (1) absent [Note: polarization of the internal units means that there is a prominent gradient of germ‐cell development within the given unit (for details see: Świątek, ,b, , ; Ben Ahmed et al., , ; Świątek et al., , ). ] Eggs: (0) yolky (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Several studies devoted to ovarian morphology and the course of oogenesis in true leeches have been published recently (Świątek, ,b, , ; Spałek‐Wołczynska et al., ; Świątek et al., , ,b; Ben Ahmed et al., , ), providing substantial new comparative data about the internal ovarian organization in leeches. Specifically, these new data include the non‐polarized ovary cords in Glossiphoniidae, egg follicles in Piscicolidae, polarized ovary cords in Hirudinidae and Haemopidae and in Erpobdellidae, as well as detailed descriptions of oogenesis (i.e.…”

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Diversity of features of the female reproductive system and other morphological characters in leeches (Citellata, Hirudinida) in phylogenetic conception

et al. 2013

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An epistemological–evolutionary conception of leeches (Hirudinida) based on features of the female reproductive system in combination with other morphological characters is presented in the spirit of the cladistic school of taxonomy. Characters relating to the structure of the ovary and the course of oogenesis in leeches were interpreted in this manner, for the first time. Each study was conducted on type species of higher taxonomic groups of true leeches. Results of analyses using features of the reproductive system only as well as in combination with other morphological characters show Piscicolidae and Glossiphoniidae as sister clades making Rhynchobdellida a monophyletic group. Also, Hirudiniformes and Erpobdelliformes appeared to be sister clades within Arhynchobdellida. The relationship between the outgroup specimens and leeches remained unresolved, because both Acanthobdella peledina and branchiobdellidans appeared to be in an equivocal relationship to hirudinidans. Characters concerning the structure of the female reproductive system and course of oogenesis thus appeared to be useful, although conservative, for reconstruction of leech phylogeny, and they well reflect phylogenetic relationships of Hirudinida at the family level.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Diversity of features of the female reproductive system and other morphological characters in leeches (Citellata, Hirudinida) in phylogenetic conception

et al. 2013

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Barbronia weberi (Clitellata, Hirudinida, Salifidae) has ovary cords of the Erpobdella type

Urbisz

Lai

Świątek

2013

Journal of Morphology

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The organization of the ovaries in representative of the Salifidae (Hirudinida, Erpobdelliformes) was studied at the ultrastructural level for the first time. Like in other leeches, the ovaries of Barbronia weberi are composed of an outer envelope (i.e., an ovisac made up of two coelomic epithelia, muscle cells, and connective tissue) and several internal units, which are broadly similar to the ovary cords found in representatives of the Erpobdellidae. There are usually 6-8 ovary cords that are twisted or cambered with a narrow apical part and a broader, irregularly shaped distal end in each ovisac of B. weberi. Each ovary cord is built from somatic and germ-line cells and the latter tend to form multicellular cysts that are equipped with a central cytoplasmic core (cytophore). There are two morphologically different subpopulations of germ-line cells: oocytes and more numerous nurse cells. Growing oocytes form protuberances on the ovary cord surface and eventually detach from the cord and float freely in the ovisac lumen, whereas the other components of germ-line cysts (i.e., nurse cells and cytophore) degenerate. It should be pointed out that there is a prominent gradient of germ-cell development along the long axis of the cord. The somatic cells form the ovary cord envelope (the so-called spongiosa cells) and also penetrate the spaces between germ-line cells. Both kinds of the somatic cells, that is, those forming the cord envelope and the somatic cells that are associated with oocytes (follicular cells) have a well-developed system of intercellular channels. Additionally, one prominent somatic cell, the apical cell, was found at the apical tip of each ovary cord. Because the aforementioned features of ovary cords found in B. weberi are very similar (with a few minor exceptions) to the ovary cords that have been described in Erpobdella octoculata and E. johanssoni, we propose the term "ovary cords of the Erpobdella type" for them. Our results support a close phylogenetic relationship between Salifidae and Erpobdellidae.

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Architecture and Life History of Female Germ-Line Cysts in Clitellate Annelids

Świątek

Urbisz

2019

Results and Problems in Cell Differentiation

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An ultrastructural study of the ovary cord organization and oogenesis in Erpobdella johanssoni (Annelida, Clitellata: Hirudinida)

Cited by 14 publications

References 53 publications

Diversity of features of the female reproductive system and other morphological characters in leeches (Citellata, Hirudinida) in phylogenetic conception

Diversity of features of the female reproductive system and other morphological characters in leeches (Citellata, Hirudinida) in phylogenetic conception

Barbronia weberi (Clitellata, Hirudinida, Salifidae) has ovary cords of the Erpobdella type

Architecture and Life History of Female Germ-Line Cysts in Clitellate Annelids

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