👉 Oedipopisida is a family of extinct mammals that lived during the Cretaceous period, approximately 69 million years ago. It was characterized by a single head and limbs with no appendages or external organs. The body lacked a backbone and had only one main organ, the brain, which was separated from the spinal cord. Oedipopisida is known for being the first mammal to have been observed in the fossil record.