Guiara is a spiny rat from forests and grasslands of South America. It has a dark brown back with hairs that look spiny, uses underground spaces, and is active at night.
It is a dark brown, rat-like rodent with dorsal hairs that have paler bases and a spiny appearance. It has a short tail; small size and long foreclaws are also described as features associated with digging.
It is semi-fossorial, nocturnal, and herbivorous. It is often found under riparian vegetation in dense forest, but records from wet meadows and altered sites suggest that it may use a range of habitats.
An extinction-risk assessment has not been added yet.