Phylum Chordata

• Notochord• Nerve chord• Tail• Pharyngeal slits

Evolution of the jaw

Phylum Chordata

• Notochord• Nerve chord• Tail• Pharyngeal slits

Subphylum Urochordata

Sea Squirts

Have notochord as a larvae

Sessile as adult

Tunicate (Sea Squirt)

Slipper Tunicate

Stalked Tunicate

Subphylum Cephalochordata

- Lanceletes

(AKA: Amphioxus)

notochord

Subphylum Cephalochordata-Poorly developed brain

- Poorly developed sense organs

-Considered an evolutionary link between invertebrates and vertebrates

notochord

Subphylum VertebrataSubphylum Vertebrata• Spinal chordSpinal chord• Movement accomplished w/ muscles attached to Movement accomplished w/ muscles attached to

an endoskeletonan endoskeleton• Digestive system w/ liver, digestive glands and Digestive system w/ liver, digestive glands and

pancreaspancreas• Heart w/ 2-4 chambersHeart w/ 2-4 chambers• Blood containing hemoglobinBlood containing hemoglobin• Paired kidneysPaired kidneys• General body plan consisting of a head, trunk General body plan consisting of a head, trunk

and two pairs of appendages (some are highly and two pairs of appendages (some are highly modified!)modified!)

Class AgnathaClass Agnatha

• Jawless fishJawless fish

• Cartilage skeletonCartilage skeleton

• Gill slitsGill slits

Gill SlitsGill Slits

Class AgnathaClass Agnatha

• Jawless fishJawless fish

• Cartilage skeletonCartilage skeleton

• Gill slitsGill slits

• No swim bladderNo swim bladder

• Two chambered heartTwo chambered heart

Two Chambered Heart

HagfishHagfish

HagfishHagfishmouthmouth

Lamprey

Lampreymouth

Class Chondrichthyes• Cartilage skeleton

• Gill slits

• Dermal denticles (skin teeth)

• No swim bladder

Prehistoric Sharks

Nurse Shark

Reef Shark

Hammerhead Shark

Southern Sting Ray

Spotted Eagle Ray

Class Osteichthyes

• Bony skeleton

• Swim bladder

• Operculum

Nassau Grouper

Beaugregory Damselfish

Queen Parrotfish

Spotfin Butterflyfish

Gray Angelfish

Moray Eel

Seahorse

Class Amphibia

• Aquatic juvenile• Terrestrial adult

Class Amphibia

• Aquatic juvenile• Terrestrial adult• Thin, moist skin• Must live in wet habitat• Three Chambered Heart

Tree Frog

American Toad

Salamander

Salamander Larvae

Redspot Newt

Class Reptilia

• Thick, scaly skin• Lay eggs on land• 4 chambered heart, but ventricles not

completely divided

Reptiles

Corn Snake

Ribbon Snake

Red Tailed Boa

Constrictor

Green Iguana

Leopard Geckos

American Alligator

Baby Alligator

Hawksbill Sea Turtle

Green Sea Turtle

Red-Bellied Turtle

Class Aves

• Endothermic (warm blooded)

• Incubate eggs• Feathers• Hollow bones• Beak• 4 chambered heart

Birds - Aves

Osprey

Great Blue Heron

Green Backed Heron

White Ibis

Roseate Spoonbills

Brown Pelican

Class Mammalia

• Endothermic (warm blooded)

• Fur• Nurse young• 4 Chambered

Heart

Mammals

Subclass Monotremata

• Lay eggs

• Nurse young

Duck Billed Platypus

Platypus Egg

Babies

Spiny Anteater

Subclass Metatheria

• Marsupial

• Pouch

Kangaroo

Baby weighs about 1 gram (0.4 oz)

Koala

Baby Koala

Oppossum

Sugar Gliders

Subclass Eutheria

Placental Mammals

RodentsRodents

Rodents

RodentsRodents

Cats

DogsDogs

BatsBats

Marine MammalsMarine Mammals

Manatees

Farm animals

Elephants