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

AB C

1 2

3 4

5 6

7 8

1011

9

Classification of Animals

Symmetry:AssymetricalRadialBilateral

Body Cavity:AcoelomatePseudoceolomateCoelomate

Embryonic OpeningsProtostomeDeuterostome

Symmetry

Body Symmetry of Animals

Asymmetrycannot 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 halvesEx- 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

AcoelomatesFLATWORMS (Phylum _________)May be the 1st organisms to evolve organs from mesodermSolid, compact bodyOrgans imbedded in the solid tissue of the body. first to have the three cell layers

Ecto/endo/mesodermHave a digestive tract (one way gut)

PseudocoelomatesRoundworms (Phylum _________)

Have a body cavityIt’s fluid-filled and partly lined with mesodermEnables animal to move more quickly

Muscles attach to the mesoderm and brace against the pseudocoelom

CoelomatesSegmented worms (Phylum ______)

Coelom provides space for development of organs/ organ systemsThis allows for membranes like the parietals and viscerals Have a TRUE body cavityCOELOM= fluid-filled space COMPLETELY surrounded by mesoderm.Coelom cushions and protects internal organs and provides room for them to grow and move independently

Ectoderm Endoderm Mesoderm Coelom

Do You Have A Cavity??? Digestive Tube

Get ready to CLICK!!!

What type of symmetry is shown here?

33%

33%

33%

Bilateral Radial Asymmetry

1. Bilateral2. Radial3. Asymmetry

What type of symmetry is shown here?

33%

33%

33%

Bilateral Radial Asymmetry

1. Bilateral2. Radial3. Asymmetry

What type of symmetry is shown here?

33%

33%

33%

Bilateral Radial Asymmetry

1. Bilateral2. Radial3. Asymmetry

What type of symmetry is shown here?

33%

33%

33%

Bilateral Radial Asymmetry

1. Bilateral2. Radial3. Asymmetry

What type of symmetry is shown here?

33%

33%

33%

Bilateral Radial Asymmetry

1. Bilateral2. Radial3. Asymmetry

What type of symmetry is shown here?

33%

33%

33%

Bilateral Radial Asymmetry

1. Bilateral2. Radial3. Asymmetry