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Nomenclature



I've been wondering...
Is there a distinction between the correct or preferred uses of the
following terms (which appear to be used interchangeably)?

ceratopian vs. ceratopid
tyrannosaur vs. tyrannosaurid
stegosaur vs. stegosaurid
ankylosaur vs. ankylosaurid
oviraptorosaur (?) vs. oviraptorid (oviraptorosaurid ?)
(?) vs. troodontid
coelurosaur vs. coelurosaurid 
etc.

Are there such words as "tyrannosaurian" and "stegosaurian" ?

Thanks!  (Thanksid)!

-- Ralph Miller III     gbabcock@best.com