the name porifera is derived from the latin pours meaning channel and ferre meaning to bear explain why porifera is good name for sponge phylum
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The name porifera means ‘pore bearer’ in Latin (a pore is a tiny hole). A sponge’s body is covered by a skin, one cell thick. This skin has lots of small pores and a few large openings. The small openings are the entrances to a complex system of channels.
The channels lead to inner chambers lined with specialized feeding cells called choanocytes or collar cells. On each collar cell a flagellum is surrounded by a ring- like comb or collar. The beating of the flagellum draws water through the comb, where tiny particles are caught and carried down to the body of the cell to be digested. These collar cells pump water through the entire sponge and filter out food for the sponge cells to eat.
The body of the sponge is a loose collection of about six different types of specialized cells. Some of these cells secrete a supporting skeleton either of collagen fibers or of tiny, sharp mineral pieces called spicules. Collagen is a protein found in all animals that helps hold cells together. Other specialized cells in the sponge carry out growth, repair, nourishment, or reproduction.
Features:
Asymmetrical
Organized as a collection of different kinds of specialized cells
No tissues
Skeleton lacking or made of spicules