Character Details
loss of internal gills
loss of internal gills
protective skin layer
skin layer of dead, horny cells to reduce water loss
Harderian gland
Harderian gland anterior to eye for lubrication of the eye to prevent drying
vomeronasal organ
vomeronasal organ in palate for smelling food
muscular tongue
well-developed muscular tongue
free neck joint
loss of bones at back of skull to allow free motion of head on neck
differentiated limb bones
four muscular limbs with separate fingers and toes
more rigid backbone
more rigid backbone with interleaving of articular projections from individual vertebrae
one sacral rib
one sacral rib connection to the backbone (beginning of hip)
+-Deuterostomata
+-Echinodermata
+-Hemichordata
+-Chordata
+-Urochordata
+-Cephalochordata
+-Craniata
+-Mixinoidea
+-Vertebrata
| +-Hyperoartia
| +-Jawless Fishes
+-Gnathostomata
+-Placodermi
+-Chondrichthyes
+-Teleostomi
+-Acanthodii
+-Osteichthyes
+-Actinopterygii
+-Sarcopterygii
| +-Coelacanthimorpha
| +-Dipnoi
+-TETRAPODA <<<<< Taxon for this page
+-Amphibia
+-Amniota
+-Synapsida
| +-Primitive Synapsids
| +-Mammalia
| +-Monotremata
| +-Marsupialia
| +-Eutheria
| +-Edentata
| +-Glires
| +-Archonta
| +-Insectivora
| +-Carnivora
| +-Ungulata
+-Reptilia
| +-Testudines
+-Diapsida
+-Primitive Diapsids
+-Sauria
+-Ichthyosauria
+-Sauropterygia
+-Lepidosauromorpha
+-Archosauromorpha
+-Crocodylomorpha
+-Pterosauria
+-Dinosauria
