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Created page with "== Introduction == A choanocyte, also known as a collar cell, is a specialized cell type found in sponges (phylum Porifera). These cells play a crucial role in the feeding and reproductive processes of sponges. Choanocytes are characterized by their distinctive collar of microvilli surrounding a single flagellum. This unique structure allows them to generate water currents and capture food particles, making them essential for the sponge's filter-feeding mechanism...."