Weapontail  The weapontail or Brazilian spiny-tailed lizard ("Hoplocercus spinosus") is a lizard belonging to the monotypic genus Hoplocercus. It is found in the Cerrado and adjacent Cerrado–Amazon mosaics in Brazil and Bolivia. It is a quite distantly related of the other members of Hoplocercidae, as it is believed to have diverged from these about 35 million years ago. The weapontail has a total length of about . As suggested by its name, it has a short, highly spiny tail (it is superficially similar to "Uromastyx" and the smaller species in "Ctenosaura"); when disturbed, it retreats to its burrow with the tail orientated towards the entrance. It is nocturnal, and feeds on arthropods.