Definition: Apocremnus is an extinct genus of herbivorous mammals that lived during the Late Cretaceous period, approximately 65 million years ago. They were known for their distinctive elongated snout and a short tail, which allowed them to hunt small prey like insects and spiders on the ground. Apocremnus was closely related to the modern-day dog, but they did not have a collarbone or any other distinguishing features typical of dogs.