Oocyte‐follicle cell differentiation in two species of Amphineurans (Mollusca), <i>Mopalia mucosa</i> and <i>Chaetopleura apiculata</i>

Anderson, Everett

doi:10.1002/jmor.1051290107

Cited by 63 publications

(19 citation statements)

References 42 publications

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“…The origin of these laminated structures is discussed in more detail by (9). In all chiton species studied so far (4,7,9), the outer layer, exposed to the gonocoel, seems to be supported by the degenerating peri-oocytic follicle cells. In Sypharochiton oocytes the inner mucous layer may be derived from Golgi vesicles (9).…”

Section: Discussionmentioning

confidence: 91%

“…Spot desmosomes, linking peri-oocytic follicle cells either to each other or to the vitellogenic oocyte are frequent in most of the follicles studied (4,22,7,20,9). The partitioning of the cytoplasm of Lepidochitona oocytes is unique (1,7).…”

Section: Discussionmentioning

confidence: 95%

“…For the entire cupules the term "chorion" is not appropriate because their material is originated not only from the follicular epithelium but also from the oocyte itself (7,10). Interestingly enough, the origin of the vitelline envelope on chiton oocytes is not mentioned in the literature (4,6,9). Its tight connection to the short oocyte microvilli and its late appearance may indicate that it is a primary envelope produced by the oocyte alone and that the follicle cells do not contribute to it (7).…”

Section: Discussionmentioning

confidence: 99%

“…Lipids and glycogen in follicle cells are found in most of the investigated ovaries: polychaetes (24), chitons (4,9), gastropods (25), echinoderms (25), fish (20). It is obvious that both substances serve as nutrients during early oogenesis.…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of Follicular Epithelia in the Ovary of Lepidochitona cinerea (L.) (Mollusca: Polyplacophora)

Richter¹

1986

Dev Growth Differ

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In the sac-like ovary of the polyplacophoran mollusc, Lepidochitona cinerea, nutritive tissue arises from the ventral gonadal wall of the organ as prominent folds which support the oocytes during the various stages of their development. Each oocyte is enveloped by the follicular epithelium. Approximately twenty follicle cells surround one full-grown oocyte and by this late stage are connected to it and to each other by desmosomes. The follicle cells contain glycogen, Golgi dictyosomes, mitochondria, lipid droplets, numerous cisternae and vesicles of the rough endoplasmic reticulum, and various kinds of lysosomes. The nutritional function of these cells and their possible role forming the oocytic hulls is discussed.The gonad and reproductive cycle of Lepidochitona cinerea have been described in detail in light microscopic and histochemical studies (1). In general, the origin of the follicle and its structure in relationship to its function varies from one species of chitons to the next (2, 3).Additional information about the nutritive role of the follicular epithelium during oogenesis is provided by (4-9) and reviewed by (10).The interrelationships between the oocyte and its surrounding follicle during oogenesis of L. cinerea are of special interest not only because the oocyte has conspicuous cupule-like appendages ("egg hull" in 10) but also because its cytoplasm becomes deeply invaginated during stage IV (1, 7). The question arises whether these invaginations are formed by the follicle cells or by the oocyte itself, and why they disappear during stage V.The origin of the hull structures decorating the surface of a full-grown oocyte has been discussed by a number of investigators for several chiton species (4, 5 , 7, 9). Whether the mucous and proteinaceous material of the oocyte hull a) is secreted by the follicular epithelium alone, b) is produced by the oocyte itself, or c) whether both cell types are involved, are questions that remained open. The present study deals with these specific aspects of oogenesis in Lepidochitona cinerea. MATERIALS AND METHODSFemales of L. cinerru were collected on the intertidal flats of the island of Sylt (North Sea). The animals were dissected in artificial sea water or in prefixatives. Parts of the ovary or isolated oocytes were fixed in 0.1 mol/l veronal acetate buffered 1 % OsO, (1 1) or in 5 % glutaraldehyde buffered with 0

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of Follicular Epithelia in the Ovary of Lepidochitona cinerea (L.) (Mollusca: Polyplacophora)

Richter¹

1986

Dev Growth Differ

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“…Im Gegensatz zum Nucleolus sind diese nur schwa& basophil und umgeben si& meist mit Chromatin, das als basophiler Saum erscheint. ANDERSON (1965) faBt diese Grana als e&te NucleoIi auf. Ihre Anzahl vergr~SBert sich mit der fortschreitenden Reifung der Eizelle.…”

Section: Geschlechtsdimorphismusunclassified

Oogenese und Sexualität der KäferschneckeLepidochitona cinereus (Mollusca, Polyplacophora)

Richter

Götting

1974

Helgolander Wiss. Meeresunters

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Oogenesis and sexuality of the chiton, Lepidochitona cinereus (Mollusca, Polyplacophora), The development of the oocytes of Lepidochitona cinereus (L.) has been studied by light microscopical techniques. This development comprises 5 stages, which can be characterized by histological features. During development the egg ceils protrude gradually from the germ epithelium and, finally, become separated from the epithelium. Preceding main vitellogenesis, the oocyte surface is enlarged by cytoplasmic protrusions, which are later reduced. The oocyte cortex or hull is multilayered and is set with appendages.

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Soma–Germline Interactions in the Ovary: An Evolutionary Perspective

Albertini

Bromfield

2010

Oogenesis

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Oocyte‐follicle cell differentiation in two species of Amphineurans (Mollusca), Mopalia mucosa and Chaetopleura apiculata

Cited by 63 publications

References 42 publications

Ultrastructure of Follicular Epithelia in the Ovary of Lepidochitona cinerea (L.) (Mollusca: Polyplacophora)

Ultrastructure of Follicular Epithelia in the Ovary of Lepidochitona cinerea (L.) (Mollusca: Polyplacophora)

Oogenese und Sexualität der KäferschneckeLepidochitona cinereus (Mollusca, Polyplacophora)

Soma–Germline Interactions in the Ovary: An Evolutionary Perspective

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