"Biologists for decades believed the existing theory was a no-brainer, as sponge choanocytes
look so much like single-celled choanoflagellates -- the organism considered to be the closest living relatives of the animals," she said.
"Halisarca caerulea is the great recycler of energy for the reef by turning over energy that nobody else can use (dissolved organic carbon) into energy that everyone can use (discarded choanocytes
)," explained De Goeij.
To determine how choanocyte
collars in large syconoid chambers filter, we fed the sponges bacteria and three sizes of latex microspheres.
Finally, the cells of the inner cell mass differentiate to choanocytes
and are arranged in a choanoderm that surrounds a newly formed large gastral cavity.
In calcareous sponges, larval flagellated cells are transformed into the choanocytes
of a juvenile during metamorphosis (Duboscq and Tuzet, 1937; Amano and Hori, 1992, 1993).
As in the present study, the development of sperm from archeocytes has been documented among other sponges as well, although spermatozoids are generally thought to develop from choanocytes
These are: the presence of choanocytes
in sponges, the perceived simplicity of sponges relative to other animals, and comparisons of early embryological events (other characters, e.g., Bardele, 1983; Garrone and Lethias, 1990; Warrior and Gall, 1985; Salvini-Plawen, 1978; Franzen, 1956, will not be considered here).
The inner zone is called the choanoderm or choanosome, comprising a chamber whose walls are formed from a single layer of flagellated cells, called choanocytes
Their entire body is organized for filtering water, which is moved inside an aquiferous system by choanocytes
," or pumping cells.
Embryogenesis and metamorphosis in a haplosclerid demosponge: gastrulation and transdifferentiation of larval ciliated cells to choanocytes
As early as 1892, the inversion of these cells to form choanocytes
was proposed for some species of sponge (3).
Feeding in sponges has been well-documented, and with the exception of the two examples cited in the introduction, the Cladorhizidae and the Hexactinellida, particle uptake in sponges occurs at the choanocytes
in the flagellated chambers or at the pinacoderm-lined incurrent canals.