Characteristics of the phylum Porifera:
1. Asymmetrical or radially symmetrical
2. Three cell types: pinacocytes, mesenchyme cells, and choanocytes
3. Central cavity, or a series of branching chambers, through which water circulates during filter feeding
4. No tissues or organs
CLASSIFICATION OF THE PORIFERA
The animal phylum whose members are sessile and either asymmetrical or radially symmetrical; body organized around a system of water canals and chambers; cells not organized into tissues or organs. Approximately 9,000 species.
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