👉 Galeopsomyia is a genus of extinct mammals that lived during the Late Cretaceous period, approximately 65 million years ago. This group was characterized by a unique and distinctive skull structure, known as the "galeopoid" or "galeoid" skull. The skull of a Galeopsomyian mammal would have been extremely large and distinct from other mammals in its class, likely indicating that it had a relatively high metabolism and/or an unusual diet.