Poriferans are marine creatures with a pore-like appearance; they are more commonly known as sponges. Typically, they resemble small bathroom sponges, and are generally a rounded shape. The body of a poriferan consists of a jelly-like mesohyl substance; this is surrounded by a layer of cells. Sponges are unique in that a number of their bodily cells have the ability to change from specialized cells to other cell types - in most animals, once a cell has specialized, it can not undergo change again. To obtain oxygen and essentially food nutrients, poriferans have a constant water flow through their bodies, which causes these important substances to be absorbed and waste products to be removed. Due to this process, sponges are without nervous, circulatory or digestive systems.
- Poriferan reproduction
- Other reproductive methods in sponges