Character Details
elongate fourth finger
very long fourth finger, forming the main wing strut
flight membrane
flight membrane connecting arm and long fourth finger with the body
narrow skull
long narrow, laterally compressed skull
+-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 <<<<< Taxon for this page
+-Dinosauria
