| SN2000 author citation | : |  | Krebs, 1974 [Sereno, 1991] | 
	
		| Original definition [PhyloCode] | : |  | Nesbitt, S.J. 2011. Bull. Amer. Mus. Nat. Hist. (no. 352): 195 ("Original definition: ... (Sereno, 1991a)"). | 
	
		| Emended definition [PhyloCode] | : |  | op. cit.: 195 ("Krebs, 1974", "Revised definition: ... (new)"). |