title: Promastodonsaurus
text: # Promastodonsaurus
  
  Promastodonsaurus ("before Mastodonsaurus") is an extinct genus of capitosauroid temnospondyls within the family Mastodonsauridae. Fossils of the genus were found in the Ischigualasto Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina.
  
  