Transcript Evolutionary Tree/Body Cavities

The Animal Kingdom
Characteristics of Animals
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Eukaryotic
Multicellular
Reproduce
Specialized Cells
Heterotrophic (must obtain food)
Must Digest Food
Most animals move and have a fixed size in
the adult form
ANIMAL PHYLA
B
A
C
11
9
10
7
8
5
6
3
1
4
2
Classification of Animals
Symmetry:
AssymetricalRadialBilateral
Body Cavity:
AcoelomatePseudoceolomateCoelomate
Embryonic Openings
ProtostomeDeuterostome
Symmetry
Body
Symmetry of
Animals
Asymmetry
cannot be divided into mirror images
Ex- sponges
•Very simple
organisms
•Believed this type
of organism
evolved 1st
Radial Symmetry:
can be cut in half along many planes that
allow for nearly identical halves
Ex- Hydra:
adaptation to
be able to
see prey
coming at it
from any
direction
Bilateral Symmetry:
a single plane divides body into two mirror
images
More complex organisms
exhibit this kind of
symmetry
Proto/Deuterostomes
• Deuterostomes
– Radial Cleavage
– Blastopore becomes the __anus_____
– Indeterminate Cleavage: which means early on in
development the fates of the cells are undetermined
• Protostomes– Spiral Cleavage
– Blastopore becomes the ____mouth___
– Determinate Cleavage- which means that each cell of the
embryo has a fixed or determined fate.
How else do we classify Animals?
• DNA
• Coelom or not
• Physical Characteristics
Body cavity
Acoelomates
FLATWORMS (Phylum _________)
May be the 1st organisms to evolve organs from
mesoderm
Solid, compact body
Organs imbedded in the solid tissue of the body.
first to have the three cell layers
Ecto/endo/mesoderm
Have a digestive tract (one way gut)
Pseudocoelomates
Roundworms (Phylum _________)
Have a body cavity
It’s fluid-filled and partly lined with
mesoderm
Enables animal to move more quickly
Muscles attach to the mesoderm and
brace against the pseudocoelom
Coelomates
Segmented worms (Phylum ______)
Coelom provides space for
development of organs/ organ systems
This allows for membranes like the
parietals and viscerals Have a TRUE
body cavity
COELOM= fluid-filled space COMPLETELY
surrounded by mesoderm.
Coelom cushions and protects internal organs and
provides room for them to grow and move
independently
Do You Have A Cavity???
Digestive Tube
Ectoderm
Endoderm
Mesoderm
Coelom
Get ready to CLICK!!!
What type of symmetry is shown here?
1. Bilateral
2. Radial
3. Asymmetry
33%
33%
33%
Bilateral
Radial
Asymmetry
What type of symmetry is shown here?
1. Bilateral
2. Radial
3. Asymmetry
33%
33%
33%
Bilateral
Radial
Asymmetry
What type of symmetry is shown here?
1. Bilateral
2. Radial
3. Asymmetry
33%
33%
33%
Bilateral
Radial
Asymmetry
What type of symmetry is shown here?
1. Bilateral
2. Radial
3. Asymmetry
33%
33%
33%
Bilateral
Radial
Asymmetry
What type of symmetry is shown here?
1. Bilateral
2. Radial
3. Asymmetry
33%
33%
33%
Bilateral
Radial
Asymmetry
What type of symmetry is shown here?
1. Bilateral
2. Radial
3. Asymmetry
33%
33%
33%
Bilateral
Radial
Asymmetry