BIO 1500: chapter 17
1. Porifera phylum- : sponges
2. -> No true tissues
- The simplest invertebrates
- Specialized cells that perform specific functions: Parazoa
3. The porifera phylum has epithelial-like cells " " form the
outermost body, : protective function like our epider-
mis.: pinacocytes, pinacoderm
4. Porifera phylum- Sponges
• No
• / along the pinacoderm allowing entry of water into the
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,body of the sponge
• Flow of water into sponge is unidirectional, driven by beating of
: mouths, ostia/pores, flagella
5. SPONGE BODY PLAN:
•5,000 named species of sponges
•Morphology: irregular cylinder with a large central cavity, the
•Water enters spongocoel through pores/ostia then expelled via a large com-
mon opening, the
•In some, feeding chambers open off spongocoel; in others, several feeding
chambers connecting to one another lie between the pores and the spongo-
coel.
2/7
, •Sponges are (or hermaphroditic): one individual can pro-
duce both eggs and sperm.: spongocoel, osculum, monoecious,
6. •Sponges reproduce both and
•Feeding chambers lined by ("collar cells").: sexually, asexually,
choanocytes
7. : generate a directed water current through the sponge
and trap and ingest microscopic food particles by phagocytosis
3/7
1. Porifera phylum- : sponges
2. -> No true tissues
- The simplest invertebrates
- Specialized cells that perform specific functions: Parazoa
3. The porifera phylum has epithelial-like cells " " form the
outermost body, : protective function like our epider-
mis.: pinacocytes, pinacoderm
4. Porifera phylum- Sponges
• No
• / along the pinacoderm allowing entry of water into the
1/7
,body of the sponge
• Flow of water into sponge is unidirectional, driven by beating of
: mouths, ostia/pores, flagella
5. SPONGE BODY PLAN:
•5,000 named species of sponges
•Morphology: irregular cylinder with a large central cavity, the
•Water enters spongocoel through pores/ostia then expelled via a large com-
mon opening, the
•In some, feeding chambers open off spongocoel; in others, several feeding
chambers connecting to one another lie between the pores and the spongo-
coel.
2/7
, •Sponges are (or hermaphroditic): one individual can pro-
duce both eggs and sperm.: spongocoel, osculum, monoecious,
6. •Sponges reproduce both and
•Feeding chambers lined by ("collar cells").: sexually, asexually,
choanocytes
7. : generate a directed water current through the sponge
and trap and ingest microscopic food particles by phagocytosis
3/7
