👉 The term "Amphisiellidae" is a family of extinct mammals that lived during the late Cretaceous period, approximately 79-68 million years ago. This group includes several species characterized by having a long neck and a narrow, forked jaw, which allowed them to hunt prey from their surroundings. The exact distribution and evolution of this group are not well-documented, but it is believed that they were widespread across the northern Eurasian continent during this time period.