Adapisoriculidae is an extinct family of eutherian mammals present during the Paleocene and possibly Cretaceous. They were once thought to be members of the order Erinaceomorpha,closely related to the Hedgehog family (Erinaceidae), because of their similar dentition, or to be basal Euarchontans. They were also thought to be Marsupials at one point. Most recent studies show them to be non-placental eutherians, however.They were small mammals of about 15 cm long, with a tail of equal length.