Diversity of Animals

1. Simple Animals

a) Phylum Porifera

“Commercial Sponge”http://www.middleschoolscience.com/spong.jpg

CHARACTERISTICS:

- No true tissues- sessile (stay fixed in one place)- asymmetrical, lack cell layers- oscula (large openings that expel water)- hermaphroditic (reproduce sexually & asexually)

Diversity of Animals

1. Simple Animals

b) Phylum Cnidaria

“Jellyfish”http://www.pinktentacle.com/images/jellyfish_invasion.jpg

“Sea Anemone”http://www.valdosta.edu/

~jlgoble/Sea%20Anemone%20Diadumene%20Dia%2030cm

%201.JPG

CHARACTERISTICS:

- cells organized into true tissues- radial symmetry (Fig. 14.5)- nerve net allows response to external stimuli- stinging structures on tentacles- asexual

Diversity of Animals

2. Worm-Like Animals

a) Phylum Platyhelminthes (“flatworms”)

“Marine Flatworm”http://www.waterworxbali.com/Images/

Photos/Large/pseudoceros-ferrugineus.jpg

“Tapeworm”http://www.dkimages.com/

discover/previews/887/45066290.JPG

CHARACTERISTICS:

- true tissue- Bilateral symmetry (two halves of animal are mirror images, Fig. 14.11)- no body cavity (flat bodies)

Diversity of Animals

2. Worm-Like Animals

b) Phylum Nematoda

“Roundworm”http://www.dkimages.com/discover/previews/

968/5001804.JPG

CHARACTERISTICS:

- True tissue- bilateral symmetry- has a body cavity- pseudocoelom (body cavity only partially lined with mesoderm)

Diversity of Animals

2. Worm-Like Animals

c) Phylum Annelida (“segemented worms”)

“Earthworm”http://www.wildlifetrust.org.uk/cheshire/

IMAGES/watch_earthworm.jpg

“Leech”http://www.sciencefriday.com/

news/041907/leech.jpg

CHARACTERISTICS:

- True tissue- Bilateral symmetry- Body cavity- True coelom - Protosome (coelom from mesoderm cells mass)- Segmented body (allow increase in body size & movement)- no jointed appendages- hermaphroditic

Diversity of Animals

3. Invertebrates

a) Phylum Mollusca (“animals with a shell”)

“Land Snail”http://www.naturephoto-cz.com/photos/others/copse-snail-

25279.jpg

CHARACTERISTICS:

- True tissue- Bilateral symmetry- Body cavity- True coelom- Protosome- no segmentation

Diversity of Animals

3. Invertebrates

b) Phylum Echinodermata

“Starfish”http://animals.nationalgeographic.com/

staticfiles/NGS/Shared/StaticFiles/animals/images/primary/starfish.jpg

“Sea Urchin”http://www.iayork.com/Images/2007/9-

3-07/Urchin.png

CHARACTERISTICS:

- True tissue- Bilateral symmetry- Body cavity- True Coelom- Deuterosome (coelom from endoderm lining)- No backbone

Diversity of Animals

4. Joint-Legged Animals

a) Phylum Arthropoda I. Crustaceans (“animals w/ an exoskeleton”)

“Crayfish”http://www.biol.andrews.edu/everglades/organisms/

Invertebrates/Arthropoda/Pond%20Crayfish/pond_crayfish-main.jpg

CHARACTERISTICS

- True tissue- Bilateral symmetry- Body cavity- True coelom- Protosome- Segmentation- Jointed appendages

Diversity of Animals

4. Joint-Legged Animals

a) Phylum Arthropoda II. Arachnids

“Garden Spider”http://entomology.unl.edu/images/spiders/argiope_aur2.jpg

Diversity of Animals

4. Joint-Legged Animals

a) Phylum Arthropoda III. Insects

“Grasshopper”http://citybugs.tamu.edu/images/grasshopper

%20differential.jpg

“Monarch Butterfly”http://www.richard-seaman.com/Arthropods/Usa/

Butterflies/Illinois/ViceroyInDaisyPatch.jpg

Diversity of Animals

5. Internal Skeletons

a) Ancestral Chordates

“Lancelet”http://images.google.ca/images?

gbv=2&svnum=10&hl=en&client=firefox-a&rls=org.mozilla%3Aen-US

%3Aofficial&q=lancelet&btnG=Search+Images

“Tunicates”http://wwwchem.uwimona.edu.jm:1104/gifs/

tunicate.jpg

Diversity of Animals

5. Internal Skeletons

b) Phylum Chordata

“Frog”http://www.naturephoto-cz.com/photos/

others/common-tree-frog-9282.jpg

“Mouse”http://www.doyourownpestcontrol.com/

house_mouse_uc.jpg

CHARACTERISTICS:

- True tissue- Bilateral symmetry- True coelom- Deuterosome- Backbone