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What type of symmetry do Bilatera have?
Bilateral
Name the 3 major groups that make up bilatera
Acoelomates
Coelomates
Pseudocoelomates
Describe the acoelomate body form
Area filled with mesoderm cells
Solid body
No coelom
e.g. flatworm
Describe the pseudocoelomate body form
Fluid filled body cavity
Partially lined with tissue from mesoderm
E.g. Nematode
Describe the coelomate body form
Completely lined with tissue from mesoderm
e.g. earthworm
What is the tissuue lining in coelomate (eucoelomate) animals known as?
Peritoneum
What are the benefits of having a body cavity?
- Acts as cushion for organs + prevents injury
- Internal organs can grow + move independently of body wall
- Medium for external transport
- Reservoir for waste deposition
- Hydrostatic skeleton in soft bodied animals
- Safe site for egg/sperm maturation
Name the two phyla of acoelomates
Platyhelminthes
Nemertea
How many species of Platyhelminthes are there?
(acoelomates)
>20,000
Describe platyhelminthes
Flatworms
Unsegmented woems
Gastrovascular cavity has only one opening
Gas exchange via diffusion
No circulatory organs
Excretion via tubular system called protinephridum
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