Invertebrates

Characteristics of Invertebrates

• Simplest animals• Contain the greatest number of different

species • Most are aquatic (found in water)• Do NOT have a backbone• Includes sponges, cnidarians, flatworms,

roundworms, annelids, mollusks, arthropods, and echinoderms

• Domain- Eukarya• Kingdom- Animalia• I. Phylum- Porifera

• Ex: all sponges

• Very simple

• http://www.youtube.com/watch?v=BW05vMziy2o&feature=fvwrel

• Domain- Eukarya• Kingdom- Animalia• II. Phylum- Cnidaria

• Ex: animals with stinging cells

jellyfish

Sea anemone

hydra

• http://www.youtube.com/watch?v=GqdvEhI1RS0

• http://www.youtube.com/watch?v=uIf0kRpkQ_0

• Domain- Eukarya• Kingdom- Animalia• III. Phylum- Platyhelminthes

• Ex: all flatworms• Hint- platy means flat!!!

planaria

tapeworm

• http://www.youtube.com/watch?v=osuABmTutZM&feature=results_main&playnext=1&list=PLB8A46404E8B20BDA

• Domain- Eukarya• Kingdom- Animalia• IV. Phylum- Nematoda

• Ex- all roundworms

Roundworms

Intestinal worms

• Domain- Eukarya• Kingdom- Animalia• V. Phylum- Annelida

• Ex- worms with segmented bodies!

Earthworms!!

leeches

• Domain- Eukarya• Kingdom- Animalia• VI. Phylum- Molluska

• Ex: animals with a shell or no shell

Clams, snails, octopi, slug

• http://www.youtube.com/watch?v=jsxAr_yrJtM

• Domain- Eukarya• Kingdom- Animalia• VII. Phylum- Arthropoda

• Means ‘jointed foot’• Ex- all insects (6 legs), spiders (8 legs),

horseshoe crabs, crustaceans

Insects- 6 legs

Spiders (arachnids) 8 legs

Horseshoe crab

• http://www.youtube.com/watch?v=DQLAzcZQAq8

http://www.youtube.com/watch?v=DQLAzcZQAq8

• Domain- Eukarya• Kingdom- Animalia• VIII. Phylum- Echinodermata

• Means ‘spiny skin’• Ex- animals with spiny skin: starfish, sea

urchins…

starfish

Sea urchin

Other Invertebrates…

• Domain- ArchaeaBacteria that live in extreme conditions-Ex- halophiles- love saltThermophiles- love heat• Domain- Bacteria- all other bacteria

most numerous of all living things!