-They include marsupials and eutherians
-They emerged from egg-laying monotremes
-They have hooves and an odd number of toes
-They have a relatively simple digestive system
Perissodactyla
-They are herbivores
-They are marsupials
Diprotodontia
Aves
-They have feathers, wings, and are bipedal
-They have no teeth and lay eggs
-They are songbirds with long tails
-They are slim with broad bills
Monarchidae
Reptilla
-They have amniotic eggs
-They have a rib-cage ventilation system
-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
Testudines
-They have rough scales
-They are often poisonous
Squamata
Amphibia
-They have four limbs
-Most have moist skin and live in both water and on land
-They have webbed digits (fingers and toes)
-They are often semi-aquatic
Anura
Sarcopterygii
-They are bony fish with lobed fins
-Each fin is a scaly stalk extending from the body
-Their skeleton is partly cartilaginous and partly bone
-They have two incisors and dental plates on the upper and lower jaws
Ceratodontiformes
-They have eight fins
-They move along currents and drifts
Coelacanthiformes
Actinoptergii
-They are aquatic gnathosomes
-They have fins supported by rays
-Some appear to be square or triangular in appearance
-They move slowly because their body structure is not flexible
Tetraodontiformes
Chondrichthyes
-They have a cartilaginous skeleton
-They are aquatic gnathosomes
They have one or more venomous stingers near the tip of the tail
-They are found in tropical to temperate marine waters
Dasyatoidea
-They have two dorsal fins
-They have a nicitating membrane (transparent) over the eye
Carcharhiniforms
Petromyzontida
-They are jawless
-They attach to living fish and ingest their blood
-They have no scales
-They have a cartilaginous skeleton
Petromyzontiformes
Myxini
-They are jawless marine animals
-They have a brain and eyes
-They are eel-shaped, smile producing animals
-They have a skull, but no vertebral column
Myxiniformes
Ascidacea
-They have a ciruclatory, digestive, and nervous system
-They have a rigid body structure
-They are an invasive species
-Some undergo regeneration
Pleurogona
Leptocardii
-Classified as invertebrates and vertebrates
-Have a backbone
-Have a translucent, fish-like body
-Have no true skeleton
