The first Ursoidea appeared in Eurasian faunas during the Oligocene (Qiu, 2003).
During the Early Miocene, the Ursoidea communities in both the Iberian Peninsula and Western Europe were similar.
During the MN3, fossil localities with large mammals are very rare in Spain, finding a gap in the record of Ursoidea. However, both the first record of the genera Hemicyon and Plithocyon (Family Hemicyonidae), as well as the first record of an Ursidae, with the genus Ballusia and Ursavus isoire, characterize the Ursoidea record in Western Europe.
During the biozone MN6 (late Aragonian) the Iberian Ursoidea record is also characterized exclusively by large sized species of the subfamily Hemicyonidae, while in the rest of Western Europe this group shares their geographical distribution with the less diverse members of the Ursidae family (genus Ursavus).
The record of this first true bear coincides with the progressive decadence of the last Hemicyonidae that become locally extinct during the late Aragonian, and marks a major change in the Ursoidea associations in Spain.