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Transcript 
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
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