Overview of Animals

Animals are…

• Eukaryotes• Multicellular• Consumers

Invertebrates vs. Vertebrates

• So what is the difference?

• Vertebrates have a backbone while invertebrates do not.

Bilateral vs radial symmetry• Bilateral-2 halves• Radial-arranged around a circle

Invertebrate-Phylum Porifera

• Ex: Sponges

• Body is filled with pores to filter food from water

Invertebrates-phylum Cnidaria• Ex: jellyfish,

hydra, sea anemone

• Have stinging cells called nematocysts

Invert.-phylum platyhelminthes• Ex: planaria,

tapeworm

• Flat body• First animal with

a primitive brain

Invert-phylum Nematoda

• Ex: hookworm

• Round body• First animal to

have a digestive tube

Invert-phylum annelida

• Ex: earthworm, leech

• Segmented bodies

• Closed circulatory system

Invert-phylum echinodermata

• Ex: Sea urchin sea star

• Spiny skin

Invert-phylum mollusca

• Ex: clam, squid, octopus, snail

• Soft body often covered by a hard shell.

Invert-phylum arthropoda

• Ex: insects, spiders, crabs, lobsters

• Hard exoskeleton• Segmented body• Jointed

appendages

VertebratesPhylum Chordata

Cartilaginous Fish: Class chondricthyes• Ex: sharks, skate.

rays

• Cold-blooded• Gills for breathing• Fins for swimming• Skeletons are

made of cartilage

Bony Fish: Class Osteichtyes

• Ex: salmon, rockfish, flounder, tuna

• Cold-blooded• Gills for breathing• Fins for swimming• Skeletons are

made of bone.

Amphibians: Class Amphibia

• Ex: salamanders, frogs, toads

• Cold-Blooded• First part of life is

in the water as a tadpole.

• Have lungs and breathe through skin

Reptiles: class reptilia• Ex: lizards,

snakes, crocs & gators, turtles

• Cold-Blooded• Scaly skin to

prevent drying out.

• Amniotic eggs with a shell.

Birds: class aves • Ex: ostrich,

chicken, eagle, hawk

• Warm-blooded• Four-chambered

heart• Hollow bones

reduce weight• Feathers.

Mammals: class mammalia• Ex: whale, wolf,

bats, rodents

• Warm-blooded• Fur or hair• Live birth.• Nursing