1) Animal order 2) Order thecodontia 
Thecodontia (meaning `socket-teeth`), now considered an obsolete taxonomic grouping, was formerly used to describe a diverse `order` of early archosaurian reptiles that first appeared in the latest Permian period and flourished until the end of the Triassic period. All of them were built somewhat like crocodiles, but with shorter skulls, more ...
• (n. pl.) A group of fossil saurians having biconcave vertebrae and the teeth implanted in sockets.
The`co·don'ti·a noun plural [ New Latin ] (Paleon.) A group of fossil saurians having biconcave vertebræ and the teeth implanted in sockets. 
[n] - extinct terrestrial reptiles having teeth set in sockets
Thecodontia A group of fossil saurians having biconcave vertebrae and the teeth implanted in sockets.
order Thecodontia noun extinct terrestrial reptiles having teeth set in sockets; of the late Permian to Triassic