Transcript Animal Evolution

DO NOW
• Juniors – tell Mrs. Strickhart what you are
taking for science next year
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What is an Animal?
Questions!
• 1. What are the characteristics of animals?
• 2. How do protostomes differ from
deuterstomes?
• What is the ancestral protistan of animals?
• What are the two major groups based on
“tissues”?
• What are the two types of symmetry?
More things to write!
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Describe the three types of body cavities.
Describe a blastula.
Describe a Blasopore
What are Lophotrochozoans?
What are Ecdysozans?
Animal Characteristics
• ingestion – eating other organisms or
decomposed material
• cell structure – lack of cell wall, form
collagen in the ECM, tight junctions,
desmosomes, gap junctions
• unique tissues – muscle and nervous tissues
for movement
Parazoa - Eumetazoa
• Parazoa – no tissues
• Eumetazoa – true tissues
Radiata - Bilateria
• Radially symmetrical
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Bilateral
• Bilateral Symmetry
• If split in two, two mirror images
result
• Cephalization - nerves and sensory
organs concentrated toward the
head end – evolved to help
organisms locate food
Acoelomate, Pseudocoelomate,
and Coelomate
• A = without a
body cavity
• Pseudo = false
body cavity, not
completely lined
• Coelomate =
body cavity
lined, fluid filled
Pseudocoleomate
Nematodes are commonly called roundworms.
They have a body cavity that does not have a
lining. The cavity is referred to as a pseudocoel.
The blastula is a
hollow ball of
cells that forms in
early embryonic
development.
Some cells migrate upward
into the blastula to form a
blastopore. This opening
eventually forms the mouth of
animals called protostomes.
If the opening does not form
the mouth, but instead forms
the anus, the animals are
deuterostomes.
Deuterstome vs Protostome
Do It NOW!!!! Quiz
Today you will be dissecting two invertebrates and earthworm
and a grasshopper. Using your animal clad, answer the
following.
1. Are these two animals Parazoans or Eumetazoans? What
does that mean?
2. Are these two animals part of Radiata or Bilateria? What
does that mean?
3. Are these animals Protostomes or Deuterostomes? What
does that mean?
4. Which animal is a Lophotrochozoan? What does that
mean?
5. Which animal is a Ectyzoan? What does that mean?
Do It NOW!!!! Quiz
Today you will be dissecting two invertebrates and earthworm
and a grasshopper. Using your animal clad, answer the
following.
1. Are these two animals Parazoans or Eumetazoans? What
does that mean?
2. Are these two animals part of Radiata or Bilateria? What
does that mean?
3. Are these animals Protostomes or Deuterostomes? What
does that mean?
4. Which animal is a Lophotrochozoan? What does that
mean?
5. Which animal is a Ectyzoan? What does that mean?
The Lophotrochozoa comprise one of the major groups within the animal
kingdom, In turn, the Lophotrochozoa belongs to a larger group within
the Animalia called the Bilateria, because they are bilaterally
symmetrical with a left and a right side to their bodies.
Lophotrochozoans
• Grouped together
because of the
molecular evidence
• Trocho = development
of trochophore larvae
• Lophophore =
horseshoe shaped
crown of ciliated
tentacles
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Ecdysozoa
• Separated into the clad
via molecular data
• Morphologically –
produce exoskeletons
therefore growth must
occur via molting