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Phylum Porifera April 29, 2003 Objectives 1. identify the structures that make up a sponge 2. explain how a sponge gets food and reproduces 3. define porifera and hermaphrodite Porifera means "pore bearing". General Characteristics • Plant vs animal • Are all aquatic, mostly marine • Vary in size and shape – asymmetrical • No division of labor Filter Feeders Sponges can filter hundreds of gallons of water a day. bacteria, diatoms, and various other protists Reproduction • Asexual –Fragmentation and budding • Sexual –External fertilization Hermaphrodite A single organism produces male and female gamete cells. 3 cell layers 1.epidermal cells – ostia 2.amoeboid cells – spicules or spongin 3. collar cells •a thick walled sack or bag •central cavity •osculum