Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae)
Abstract. I describe an unusual case of follicular oogenesis in a bivalve, Gaimardia trapesina , a common marine bivalve from the Magellan Region and adjacent Sub‐Antarctic waters, whose members brood their developing larvae. The gonad in G. trapesina is an acinus organ that infiltrates the perivisc...
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crwiley:10.1111/j.1744-7410.2009.00171.x 2023-12-03T10:13:53+01:00 Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) Ituarte, Cristián 2009 http://dx.doi.org/10.1111/j.1744-7410.2009.00171.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1744-7410.2009.00171.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1744-7410.2009.00171.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Invertebrate Biology volume 128, issue 3, page 243-251 ISSN 1077-8306 1744-7410 Animal Science and Zoology journal-article 2009 crwiley https://doi.org/10.1111/j.1744-7410.2009.00171.x 2023-11-09T13:55:46Z Abstract. I describe an unusual case of follicular oogenesis in a bivalve, Gaimardia trapesina , a common marine bivalve from the Magellan Region and adjacent Sub‐Antarctic waters, whose members brood their developing larvae. The gonad in G. trapesina is an acinus organ that infiltrates the perivisceral connective tissue; the walls of the acini are formed by tall, slender cells with distal nuclei, supported by a thin conjunctive tissue layer. At the onset of vitellogenesis, each developing oocyte becomes surrounded by a one‐cell‐thick layer of follicle cells, which may originate from the wall of the acinus. The cells form a follicle that completely encompasses single oocytes, except at the basal zone, where oocytes are in contact with the acinus wall. The follicle persists beyond the end of vitellogenesis and spawning. After gamete release, the persistent follicle participates in the attachment of ova and developing embryos to the interfilamental junctions of the inner and outer demibranchs of the gill, where embryos are incubated until hatching as late‐stage pediveliger larvae. Ripe eggs are large (∼250 μm diameter), suggesting that development is entirely lecithotrophic. The follicle cells that mediate connections between developing embryos and the maternal individual probably have a mechanical role only, providing support and possibly facilitating the accommodation of a large number of embryos to maximize the branchial space available for brooding. Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library (via Crossref) Antarctic Invertebrate Biology 128 3 243 251 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Animal Science and Zoology |
spellingShingle |
Animal Science and Zoology Ituarte, Cristián Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) |
topic_facet |
Animal Science and Zoology |
description |
Abstract. I describe an unusual case of follicular oogenesis in a bivalve, Gaimardia trapesina , a common marine bivalve from the Magellan Region and adjacent Sub‐Antarctic waters, whose members brood their developing larvae. The gonad in G. trapesina is an acinus organ that infiltrates the perivisceral connective tissue; the walls of the acini are formed by tall, slender cells with distal nuclei, supported by a thin conjunctive tissue layer. At the onset of vitellogenesis, each developing oocyte becomes surrounded by a one‐cell‐thick layer of follicle cells, which may originate from the wall of the acinus. The cells form a follicle that completely encompasses single oocytes, except at the basal zone, where oocytes are in contact with the acinus wall. The follicle persists beyond the end of vitellogenesis and spawning. After gamete release, the persistent follicle participates in the attachment of ova and developing embryos to the interfilamental junctions of the inner and outer demibranchs of the gill, where embryos are incubated until hatching as late‐stage pediveliger larvae. Ripe eggs are large (∼250 μm diameter), suggesting that development is entirely lecithotrophic. The follicle cells that mediate connections between developing embryos and the maternal individual probably have a mechanical role only, providing support and possibly facilitating the accommodation of a large number of embryos to maximize the branchial space available for brooding. |
format |
Article in Journal/Newspaper |
author |
Ituarte, Cristián |
author_facet |
Ituarte, Cristián |
author_sort |
Ituarte, Cristián |
title |
Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) |
title_short |
Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) |
title_full |
Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) |
title_fullStr |
Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) |
title_full_unstemmed |
Unusual modes of oogenesis and brooding in bivalves: the case of Gaimardia trapesina (Mollusca: Gaimardiidae) |
title_sort |
unusual modes of oogenesis and brooding in bivalves: the case of gaimardia trapesina (mollusca: gaimardiidae) |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1111/j.1744-7410.2009.00171.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1744-7410.2009.00171.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1744-7410.2009.00171.x |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Invertebrate Biology volume 128, issue 3, page 243-251 ISSN 1077-8306 1744-7410 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1744-7410.2009.00171.x |
container_title |
Invertebrate Biology |
container_volume |
128 |
container_issue |
3 |
container_start_page |
243 |
op_container_end_page |
251 |
_version_ |
1784260845112393728 |