In case of poriferans the spongocoel is lined with flagellated cells called :
ostia
oscula
choanocytes
mesenchymal cells
As we learnt in
Choanoderm -
Gastral epithelium layer consists of flagellated cell or choanocytes.
- wherein
These are characteristics cell of phylum porifera responsible for ingestion of food and differentiation of sex cell.
Choanocytes (collar cells) form lining of spongocoel in poriferans (sponges). Flagella in collar cells provide circulation to water in water canal system