The pinacoderm is composed of pinacocytes, flattened epithelial cells that can expand or contract to slightly alter the size and shape of the sponge. It also contains porocytes, oval-shaped cells extending from the pinacoderm to the choanoderm (the body layer containing choanocytes).
- Charles F. Lytle and John R. Meyer (2005). General Zoology Laboratory Guide (Fourteenth ed.).
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