Morphological aspects of oogenesis in the deep-sea clam Calyptogena pacifica (Pliocardiinae; Vesicomyidae)

The ultrastructure of oogenic cells and mature oocytes has been described in a deep-sea clam, Calyptogena pacifica , for the first time. Specimens were collected in June 2018 from the Piip volcano in the Bering Sea (55.3821° N, 167.2613° E). Female germ cells developed in the branched gonadal tubule...

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Bibliographic Details
Published in:Marine biology 2024, Vol.171 (1), p.8, Article 8
Main Authors: Yurchenko, Olga V., Borzykh, Oleg G., Kalachev, Alexander V.
Format: Article
Language:English
Subjects:
Antigen-presenting cells
Biomedical and Life Sciences
Calyptogena pacifica
Cell size
Deep sea
Deep sea environments
Deep water
Dispersal
Droplets
Egg yolk
Embryos
Endoplasmic reticulum
Follicles
Freshwater & Marine Ecology
Gametocytes
Germ cells
Granular materials
Inclusions
Larvae
Life Sciences
Lipids
Littoral environments
Marine & Freshwater Sciences
Marine biology
Microbiology
Nutrients
Oceanography
Oocytes
Oogenesis
Original Paper
Symbionts
Tubules
Ultrastructure
Vitellogenesis
Volcanoes
Yolk
Zoology
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Summary:The ultrastructure of oogenic cells and mature oocytes has been described in a deep-sea clam, Calyptogena pacifica , for the first time. Specimens were collected in June 2018 from the Piip volcano in the Bering Sea (55.3821° N, 167.2613° E). Female germ cells developed in the branched gonadal tubules. The pattern of oogenic development is similar to that in littoral species. Although somatic accessory cells do not form any follicles around developing oocytes, these cells have a well-developed endoplasmic reticulum, which could be a source of yolk precursors and be involved in vitellogenesis. Lipid droplets appear in early oocytes, but they disappear later, suggesting that developing oocytes use these lipid droplets. At the onset of vitellogenesis, developing oocytes accumulate lipids in the ooplasm facing the gonadal tubule wall. Yolk granules, in contrast, appear at later stages of oogenesis. Mature oocytes, which are 200 µm in diameter, are filled with a significant volume of lipid droplets (occupying 24% of ooplasm) and a smaller volume of yolk granules (~ 8%). The mature oocyte’s features, i.e., the large cell size (~ 200 µm in diameter) and the high abundance of ooplasmic inclusions, are typical of species with lecithotrophic development. The large volume of lipid droplets would enhance buoyancy of the oocytes and provide embryos and larvae with nutrients during dispersal. Symbiotic bacteria were found in accessory cells, in vitellogenic oocytes, and within remnants of degenerating oocytes.
ISSN:0025-3162
1432-1793
DOI:10.1007/s00227-023-04335-9