ZyzomysZyzomys is a genus of rodents with unusually thick, long tails. Five species of the genus are known in Australia, where they are called rock rats or thick-tailed rats. The genus was classified by Michael Rogers Oldfield Thomas in 1909.TaxonomyThere are five known species of rock-rat. The central rock rat was once believed to be extinct until rediscovered in 1996.Silver-tailed rock rat, Zyzomys argurusArnhem Land rock rat, Zyzomys mainiCarpentarian rock rat, Zyzomys palatilisCentral rock rat, Zyzomys pedunculatusKimberley rock rat, ''Zyzomys woodwardi''