An ultrastructural study of oocytic development enabled the identification of changes occurring during oogenesis in Pecten maximus collected from the Bay of St. Brieuc, France, in Each oocyte seems to be associated with only one secretory cell, which is characterised by an abundant rough endoplasmic reticulum at the onset of vitellogenesis.
Contact between this cell and a developing oocyte is maintained by a desmosome-like junction which can be observed when the vitelline coat is formed. Oocytic degeneration is discussed in detail; in this species, it is a continuous phenomenon of varying intensity throughout the year.
The ultrastructural changes resulting in lysis of the oocyte are described, and the evolution of atretic oocytes is examined. This is a preview of subscription content, log in via an institution to check access. Institutional subscriptions. Albertini, L. Allarakh, C. Auffret, M. Bal, K. Ultrastructural changes in the accessory cells and the oocyte surface of the sea urchin Strongylocentrotus droebachiensis during vitello-genesis.
Google Scholar. Blades-Eckelbarger, P. The ultrastructure of oogenesis and yolk formation in Labidocera aestiva Copepoda: Calanoida. Cheng, T. Functional morphology and biochemistry of molluscan phagocytes.
Coe, W. Development of the primary gonad and differentiation of sexuality in Teredo navalis and other pelecypod molluscs. Development of the reproductive system and variations in sexuality in Pecten and other pelecypod mollusks. Arts Sci. Daniels, E. Ultrastructure of oocytes from the American oyster Crassostrea virginica Gmelin. Eckelbarger, K.
