chordata

Chordates 
Fossil range: Latest Ediacaran - Recent
Scientific classification
Domain: Eukaryota 
Kingdom: Animalia 
Subkingdom: Eumetazoa 
(unranked): Bilateria 
Superphylum: Deuterostomia 
Phylum: Chordata, Bateson, 1885

Avicephala is an extinct order of bizarre diapsid reptiles that lived during the Late Permian and Triassic periods. Many species had odd specialized grasping limbs and prehensile tails, adapted to arboreal (and possibly aquatic) lifestyles.