Character Details
at least three sacral ribs
at least three pairs of sacral ribs, making the hip more substantial for carrying a larger proportion of body weight
long legs
long legs, connected to the more solid hip socket so that the legs were more vertical, not sprawling out to the side
short arms
arms less half the length of legs, or less, in early forms, making for a bipedal dinosaurian beginning
deltopectoral crest
humerus (upper arm bone) with large attachment for muscles called the deltopectoral crest
loss of fifth finger
loss of the fifth finger on the hand
cnemial crest
tibia (larger lower leg bone) with cnemial crest for attachment of strong leg muscles
elongate metatarsals
elongation of metatarsals (main bones of feet), along with strengthening of the ankle joint
+-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
+-Crocodylomorpha
+-Pterosauria
+-DINOSAURIA <<<<< Taxon for this page
