Post on 01-Jan-2016
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
Classification of Animals
Symmetry:AssymetricalRadialBilateral
Body Cavity:AcoelomatePseudoceolomateCoelomate
Embryonic OpeningsProtostomeDeuterostome
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.
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
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