Chordata

-Classified as invertebrates and vertebrates
-Have a backbone

Amphioxiformes

-Have a translucent, fish-like body
-Have no true skeleton

-They have a ciruclatory, digestive, and nervous system
-They have a rigid body structure

Pleurogona

-They are an invasive species
-Some undergo regeneration

-They are jawless marine animals
-They have a brain and eyes

Myxiniformes

-They are eel-shaped, smile producing animals
-They have a skull, but no vertebral column

-They are jawless
-They attach to living fish and ingest their blood

Petromyzontiformes

-They have no scales
-They have a cartilaginous skeleton

-They have a cartilaginous skeleton
-They are aquatic gnathosomes

Carcharhiniforms

-They have two dorsal fins
-They have a nicitating membrane (transparent) over the eye

Dasyatoidea

They have one or more venomous stingers near the tip of the tail
-They are found in tropical to temperate marine waters

-They are aquatic gnathosomes
-They have fins supported by rays

Tetraodontiformes

-Some appear to be square or triangular in appearance
-They move slowly because their body structure is not flexible

-They are bony fish with lobed fins
-Each fin is a scaly stalk extending from the body

Coelacanthiformes

-They have eight fins
-They move along currents and drifts

Ceratodontiformes

-Their skeleton is partly cartilaginous and partly bone
-They have two incisors and dental plates on the upper and lower jaws

-They have four limbs
-Most have moist skin and live in both water and on land

Anura

-They have webbed digits (fingers and toes)
-They are often semi-aquatic

-They have amniotic eggs
-They have a rib-cage ventilation system

Squamata

-They have rough scales
-They are often poisonous

Testudines

-They have a bony or cartilaginous shell that developed from their ribs
-They have a higher body temperature than surrounding water, because they have a high metabolic rate

-They have feathers, wings, and are bipedal
-They have no teeth and lay eggs

Monarchidae

-They are songbirds with long tails
-They are slim with broad bills

-They include marsupials and eutherians
-They emerged from egg-laying monotremes

Diprotodontia

-They are herbivores
-They are marsupials

Perissodactyla

-They have hooves and an odd number of toes
-They have a relatively simple digestive system