What is the Difference Between Pinacoderm and Choanoderm?

Pinacoderm and choanoderm are two unique layers of cells found in sponges belonging to the Phylum Porifera. The main differences between these two layers are:

1. Location: Pinacoderm is a layer of cells that cover the external surfaces of sponges, while choanoderm is a layer of cells that cover the internal surfaces of sponges.
2. Cell Composition: Pinacoderm is made up of pinacocytes, which are nucleated, flat, and broad cells that form a T-shape. Choanoderm, on the other hand, is made up of choanocytes, which are flagellated cells covered with a collar of microvilli.
3. Function: Pinacoderm serves as an external barrier to protect the underlying cells from the outer environment. Choanoderm, being the inner layer, lines the internal surface of the sponge and is involved in the sponge's feeding process.
4. Surface Coverage: Pinacoderm is a layer of cells that lines the outer surface of sponges. Choanoderm is the innermost body layer or inner surface of sponges.

In summary, pinacoderm and choanoderm are two distinct layers of cells in sponges that differ in their location, cell composition, function, and surface coverage.

Comparative Table: Pinacoderm vs Choanoderm

Here is a table comparing the differences between pinacoderm and choanoderm:

Pinacoderm and choanoderm are unique cellular layers found in sponges belonging to the Phylum Porifera. Pinacoderm is the outermost cell layer, composed of pinacocytes, and serves as a protective barrier for the underlying cells. Choanoderm, on the other hand, is the innermost cell layer, composed of choanocytes, and plays a role in water circulation and filter-feeding.