By Frederick W. Harrison
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Haliclona loosanoffi is also found in habitats where the usual salinity is considerably lower than this. I would think that in these situations the gemmules would have a lower range in which they germinate and probably a lower tolerance, and also, could possibly tolerate expo sure to fresh water. CHEN: There is one species of Haliclona which exists subtidally in a constant environment. From April through August every year, gemmules constantly appear inside the sponge. FELL: The occurrence of gemmules is seasonal even though the environment is so uniform?
The fuchsinophil cells migrate from the maternal mesohyl into the nurse cavity and, finally, the larva takes in fuchsino phil cells through an opening among the posterior larval cells. Thus, the embryos increase in size during larval formation. Ultrastruetural studies on the larva show that the fuchsinophil cells are being degraded. This evidence has led me to suggest that "nucleolate" cells are involved in vitellogenesis of the oocyte and fuchsinophil cells are as sociated with embryonic development.
This indicates that the germanium is uncoupling the system. Normally, growth of the organic filament is coupled with the growth of the silicalemma, the surrounding membrane, to pro duce a geometric spicule. Germanium apparently uncouples them by inhibiting the growth of the filament but permitting the silicalemma to develop. Silicon is pumped into the sil icalemma which flares out, producing the bulbous structure. Some of the spicules are nothing but a bulb with very short points. POIRRIER: Dr.
Aspects of Sponge Biology by Frederick W. Harrison