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Ultrastructure of oogenesis in two tropical oviparous Demospongiae (Porifera): Cinachyrella apion and Tethya maza.
J Morphol
September 2023
Universidade Federal da Bahia, Instituto de Biologia, Rua Barão de Jeremoabo, s/n, Ondina, Salvador, Brazil.
Article Synopsis
- * This study focuses on oogenesis in two tropical oviparous demosponges, Cinachyrella apion and Tethya maza, using light and electron microscopy to explore their reproductive cell structures and processes.
- * The findings reveal that C. apion's oocytes develop through a mixed vitellogenic pathway, while T. maza's oocytes follow a heterosynthetic pathway, with unique accessory cells in T. maza potentially aiding in trophic support and ecological efficiency in egg production.
Sexual reproduction of the placental brooder Celleporella hyalina (Bryozoa, Cheilostomata) in the White Sea.
J Morphol
February 2019
Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Saint Petersburg, Russia.
The evolution of parental care is a central field in many ecological and evolutionary studies, but integral approaches encompassing various life-history traits are not common. Else, the structure, development and functioning of the placental analogues in invertebrates are poorly understood. Here, we describe the life-history, sexual colony dynamics, oogenesis, fertilization and brooding in the boreal-Arctic cheilostome bryozoan Celleporella hyalina.
View Article and Find Full Text PDFCytodifferentiation and vitellogenesis during oogenesis in arachnida: Cytological studies on developing oocytes of a harvestman.
J Morphol
February 1980
Department of Zoology, The University of Iowa, Iowa City, Iowa 52242.
Light and electron microscope studies were made on harvestman oocytes during the course of their origin, differentiation, and vitellogenesis. The germ cells appear to originate from the ovarian epithelium. They subsequently migrate to the outer surface of the epithelium, where they remain attached often by means of stalk cells which suspend them in the hemocoel during oogenesis.
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