 Phalanx IV-2 is over twice the width of phalanx II-2, and nearly three times the expected width based on similarly sized members of its taxonomic family.This has suggested to some researchers that the holotype specimen is a paleontological chimera; however, there is no uncertainty about the affinity of the taxon, so a chimera hypothesis can not be assured.Several of "Austroraptor"'s skull bones bear some resemblance to those of the smaller troodontids.