There is only a single specimen of "Anserimimus", its holotype IGM 100/300. It consists of a rather complete and articulated skeleton lacking the skull and lower jaws. Limited information has been published on the anatomy of "Anserimimus", as Barsbold did not describe most of these bones, instead focusing on only those with features that set "Anserimimus" apart from other ornithomimids. In an unpublished thesis Robert Bronowicz in 2005 gave a detailed description of the species, also referring additional material to it, among which a second partial skeleton, specimen ZPAL MgD-I/65. However, in 2010 Bronowicz concluded this other find, though most closely related to "Anserimimus planinychus", probably represented a separate taxon.