Bandril (species) because of the planet of the same name.
Talk about it here.
Apparently reptilian, the Bandrils lived on Bandril, a planet near Karfel. The Bandrils' relationship with the Karfelons was sometimes friendly. The Bandrils subsisted in part on grain from Karfel. (TV: Timelash)
Sometime before 1969, the Bandrils were conquered by the Dominators, although that may be part of the usual propaganda the Dominators spread. (PROSE: Mutually Assured Domination) In late October 1969, Colonel Douglas of the Fifth Operational Corps led a platoon to deal with Bandrils in the highlands of Argyll. (PROSE: The Lost Skin)
Other references Edit
Behind the scenes Edit
Lance Parkin has stated that the Bandril invasion reference was a joke, based on the Bandrils being "rubbish" monsters, and that "some alien invasions were beneath the Doctor's dignity to deal with".