> Eudora
> Our Universe
> Galaxies
> Individual Galaxies
> Milky Way
> Spiral Arms of the Milky Way
> Orion–Cygnus Arm
> Individual Planetary & Star Systems in the Orion-Cygnus Arm
> Solar System
> Objects in the Solar System
> Planets of the Solar System
> Individual Planets in the Solar System
> Earth
> Chronology of Earth
> History of the Earth
> Evolution of Life
> Tree of Life on Earth
> Domains, Species Kingdoms etc.
> Node
> Eukaryota
> Unikonta
> Opisthokonta
> Holozoa
> Filozoa
> Node
> Animalia (syn. Metazoa)
> Eumetazoa
> Bilateria
> Nephrozoa
> Deuterostomia
> Node
> Chordata
> Node
> Craniata
> Vertebrata
> Node
> Node
> Node
> Node
> Node
> Gnathostomata
> Eugnathostomata
> Teleostomi
> Osteichthyes
> Sarcopterygii
> Tetrapodomorpha
> Node
> Node
> Node
> Node
> Node
> Node
> Node
> Node
> Tetrapoda (Terrestrial Vertebrates)
> Node
> Node
> Node
> Node
> Node
> Node
> Node
> Node
> Crown Tetrapoda
> Reptiliomorpha
> Node
> Node
> Amniota
> Synapsida
Caseasauria
Eupelycosauria. Pelycosaur. Evolutionary history[edit] Characteristics[edit] At least two pelycosaur clades independently evolved a tall sail, consisting of elongated vertebral spines: the edaphosaurids and the sphenacodontids.
