Character Details
antorbital fenestra
antorbital fenestra, an extra opening on each side of the skull in front of the eye socket
teeth in sockets
teeth set in sockets for a stronger attachment
mandibular fenstra
new opening in the bones of the lower jaw called the mandibular fenestra
fourth trochanter
fourth trochanter (ridge for attachment of muscles) on the femur (thigh bone)
+-Deuterostomata
+-Echinodermata
+-Hemichordata
+-Chordata
+-Urochordata
+-Cephalochordata
+-Craniata
+-Mixinoidea
+-Vertebrata
| +-Hyperoartia
| +-Jawless Fishes
+-Gnathostomata
+-Placodermi
+-Chondrichthyes
+-Teleostomi
+-Acanthodii
+-Osteichthyes
+-Actinopterygii
+-Sarcopterygii
| +-Coelacanthimorpha
| +-Dipnoi
+-Tetrapoda
+-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 <<<<< Taxon for this page
+-Crocodylomorpha
+-Pterosauria
+-Dinosauria
