animal kingdom

Characteristics of animals

Eukaryotic, multicellular, heterotrophic

Most have bilateral symmetry

Some have no symmetry

Some have radial symmetry

Bilateral symmetry

Right and left side of body is symmetrical

Radial symmetry

Body is arranged around a central point

2 divisions of bilaterally symmetrical animals (all phyla except Cnidaria and porifera)

Protostomes and Deuterostomes

Protostomes

Mouth forms before anus in embryonic development

Deuterostomes

Anus forms before mouth in embryonic development

Chordata are deuterostomes

Phylums of the Animal kingdom

Porifera, Cnidaria, Platyhelminthes, Mollusca, Annelida, Arthropoda, Chordata

Porifera characteristics

Aquatic, non motile animals

Generally dont show symmetry

Do not have tissues

Porifera examples

Chalina - finger sponge

Spongia officinialis - sea sponge

Cnidaria characteristics

Aquatic animals that show radial symmetry

Some live in colonies (coral) and others are single

Cnidaria examples

Aurelia - moon jellies

Platyhelminthes

Flatworms

May be free living or parasitic

Have flat body which is bilaterally symmetrical

Platyhelminthes examples

Tania solium - tapeworm

Planaria genus - flatworm

Mollusca characteristics

Can live in land or water

Have a mantle (soft layer of tissue that covers its organs)

And radula (feeding organ)

Most have shells (not squid or octopus)

Mollusca examples

Octopus - octopus

Mytilus - common mussel

Annelida characteristics

Segmented worms with bilateral symmetry

Found on water & on land

Annelida examples

Alitta virens - sandworm

Eisenia foetida - “red wiggler” earthworm

Arthropoda characteristics

Insects

Have exoskeletons made up of chitin

Have segmented bodies and joined appendages

Arthropoda examples

Limulus - horseshoe crab

Diptera - flies

Chordata similarities between vertebrae

Notochord😭

Have spine

Chordata examples

Humans, tiger, cats, dogs, squirrels

Ptera meaning

Wings