Ultrastructural study of embryonic development in Grantia compressa F. (Porifera, Calcarea)
Gallissian, M.F.
Archives d'Anatomie Microscopique et de Morphologie Experimentale 72(1): 59-75
1983
ISSN/ISBN: 0003-9594 PMID: 6639044 Document Number: 218443
The embryonic development of Grantia compressa is studied by means of the electron microscope from the blastula inside the mesenchyme to the mature amphi-blastula released in the excurrent canals. The study of the different cellular categories of the embryon shows the distribution of the vitellin inclusions and their evolution. The ultrastructure of the "cellules en croix" is not in favour of a photoreceptor part.