The Animal Kingdom
Characteristics of Animals
 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
Get ready to CLICK!!!
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
What type of symmetry is shown
here?
1. Bilateral
2. Radial
3. Asymmetry
How else do we classify
Animals?
 DNA
 Coelom or not
 Physical Characteristics
Proto/Deuterostomes
 Deuterostomes
 Radial Cleavage
 Blastopore becomes the _______
 Indeterminate Cleavage: which means early on in
development the fates of the cells are undetermined
 Protostomes Spiral Cleavage
 Blastopore becomes the _______
 Determinate Cleavage- which means that each cell
of the embryo has a fixed or determined fate.
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