Abstract
Spermatogensis of the freshwater sponge Ephydatia fluviatilis begins with differential mitosis of choanocytes in the flagellated chambers. The spermatogonia thus produced aggregate in the mesenchyme by amoeboid movement. They are surrounded by dendritic cells which eventually form the walls of spermatocysts, within which spermatogenesis takes place. Notable features are the early formation of flagella in first order spermatocytes and the appearance of two flagella in the metaphase of the second maturation division.
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