Within Coelurosauria exists a slightly less inclusive clade named Tyrannoraptora. This clade was defined by Sereno (1999) as ""Tyrannosaurus rex", "Passer domesticus" (the house sparrow), their last common ancestor, and all of its descendants". As tyrannosauroids are considered to be the most basal large group within Coelurosauria, this means that the common ancestor of tyrannosauroids and birds was an even more basal coelurosaurian. As a result, almost all coelurosaurians are also tyrannoraptorans, with the only exceptions being particularly basal species such as "Zuolong salleei or Sciurumimus albersdoerferi". Within Tyrannoraptora exists a slightly less inclusive clade named Neocoelurosauria erected by Hendrickx, Mateus, Araújo and Choiniere (2019), defining it as "the clade Compsognathidae + Maniraptoriformes", which can be more or less inclusive than Maniraptoromorpha depending on the topology.