Cover image:

Labial view of Neochoerus occidentalis from late Blancan of Tecolotlán basin, Jalisco, Mexico. The masseteric ridge ends in p4, the entire simphysis and the complete incisor ends in the second prism of the first molar in the lingual side; The genus Neochoerus is among the first neotropical migrants in the central region of Mexico; see article by Carranza-Castañeda in this issue. Photo by: J. Jesús Silva Corona.