Kingdom Animalia

Characteristics

Eukaryotic organisms

Multicellular

No cell walls

Heterotrophs (consumers)

Characteristics

Specialized tissues for impulses and movement (nervous system)

Movement relates to ability to find food

Most develop from Zygotes

Body Plans - Symmetry

Animals that are irregular in shape are asymmetrical

Animals that are regular in shape are symmetrical

Symmetry An animal has radial

symmetry if it can be divided along any plane, through a central axis, into even halves

An animal has bilateral symmetry if it can be divided down it's length into similar right and left halves

Bilateral Symmetry

Those with Bilateral Symmetry have:

Dorsal (top)

Ventral (bottom)

Anterior (front)

Posterior (back)

Invertebrates

8 main Phyla

No backbones

95% of all animals belong to this group

Phylum Porifera

Examples: Tube Sponge, Glass Sponge, Sea Sponge

Phylum Porifera

Approx. 5 000 species

Sessile (immobile) Asymmetrical No mouth or digestive cavity Marine or fresh water

Phylum Cnidaria

Examples: Jellyfish, Hydra, Sea anemones, and corals

Phylum Cnidaria

Approx. 10 000 species

Sessile or motile Medusoid (jellyfish) or polyp (inverted jellyfish)

form in life cycle Radial symmetry Mostly marine, some fresh water

Phylum Platyhelminthes(flatworms)

Examples: Planaria, Tapeworm, Tubellarians, Flukes

Phylum Platyhelminthes

Approx. 19 000 species

Free-living in marine or fresh water, or parasitic Body flattened dorsoventrally Mouth only

Phylum Nematoda(roundworms)

Examples: Hookworm, pinworm, Trichinella

Phylum Nematoda

Approx. 20 000+ species

Cylindrical, slender, tapered at either end Free-living or parasitic

Phylum Annelida(segmented worms)

Examples: Earthworms, leeches, polychaetes

Phylum Annelida

Approx. 12 000+ species

Segmented body Terrestrial and aquatic Mouth and anus

Phylum Mollusca

Examples: Snails, clams, squids

Phylum Mollusca

Approx. 100 000+ species

Muscular foot Shell present in many forms All habitats

Phylum Arthropoda

Examples: Insects, crab, mites, ticks, spiders, centipedes

Phylum Arthropoda

Approx. 1 000 000+ species

Segmented body, some segments may be fused

Jointed appendages External skeleton

Phylum Echinodermata

Examples: Starfish, Sea Cucumbers, Sea Urchins

Phylum Echinodermata

Approx. 7 000 species

Adults have pentamerous (five-sided) radial symmetry

marine

Vertebrates

Have backbones

1 main Phyla

Only 5% of animals belong to this group, including us

Phylum Chordata

Examples: Fish, amphibians, reptiles, birds, mammals

Phylum Chordata

Approx. 7 000 species

Notochord (flexible rod shaped body of embryo) at some time in life history

Bilateral symmetry